SQ24T10050-NEC0G_技术文档

The SemiQ™ Family of DC-DC converters provides a high efficiency single output

in a size that is only 60% of industry-standard quarter-bricks, while preserving the

same pinout and functionality.

In high temperature environments, for output voltages ranging from 3.3 V to 1.0 V,

the thermal performance of SemiQ™ converters exceeds that of most competitors'

20 -30 A quarter-bricks. This is accomplished through the use of patent pending

circuit, packaging and processing techniques to achieve ultra-high efficiency,

excellent thermal management and a very low body profile.

Low body profile and the preclusion of heat sinks minimize airflow shadowing, thus

enhancing cooling for downstream devices. The use of 100% automation for

assembly, coupled with advanced electric and thermal design, results in a product

with extremely high reliability.

Operating from an 18-36 V input, the SQ24 Series converters of the SemiQ™ Family

provide any standard output voltage from 12 V down to 1.0 V. Outputs can be

trimmed from –20% to +10% of the nominal output voltage (±10% for output

voltages 1.2 V and 1.0 V), thus providing outstanding design flexibility.

With a standard pinout and trim equations, the SQ24 Series converters are perfect

drop-in replacements for existing quarter brick designs. Inclusion of this converter

in new designs can result in significant board space and cost savings. The device

is also available in a surface mount package.

In both cases the designer can expect reliability improvement over other available

converters because of the SQ24 Series’ optimized thermal efficiency.

18-36 VDC Input; Outputs from 1-12 VDC

Available in through-hole and SM packages

Outputs available in 12.0, 8.0, 6.0, 5.0, 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 V

High efficiency – no heat sink required

On-board input differential LC-filter

Extremely low output and input ripple

Start-up into pre-biased output

No minimum load required

Fixed-frequency operation

Fully protected

•

Remote output sense

Output voltage trim range: +10%/−20% (except 1.2 V and 1.0 V outputs

with trim range ±10%) with industry standard trim equations

High reliability: MTBF of 3.4 million hours, calculated per Telcordia TR-

332, Method I Case 1

•

Positive or negative logic ON/OFF option

All materials meet UL94, V-0 flammability rating

Approved to the latest edition and amendment of ITE Safety standards,

UL/CSA 60950-1 and IEC60950-1

•

RoHS lead-free solder and lead-solder-exempted products are available

•

2

SQ24 Series

1

ELECTRICAL SPECIFICATIONS

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, All output voltages, unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Absolute Maximum Ratings

Input Voltage

Continuous

0

40

85

VDC

°C

Operating Ambient Temperature

Storage Temperature

Input Characteristics

Operating Input Voltage Range

-40

-55

125

°C

18

16

15

24

17

16

36

VDC

Turn-on Threshold

Turn-off Threshold

17.5

16.5

Input Under Voltage Lockout (Non-latching)

Isolation Characteristics

I/O Isolation

2000

VDC

pF

1.0 - 3.3 V

5.0 - 6.0 V

8.0 V, 12 V

160

260

230

Isolation Capacitance

pF

Isolation Resistance

Feature Characteristics

Switching Frequency

10

MΩ

415

kHz

%

Industry-std. equations (1.5 - 12 V)

Industry-std. equations (1.0 - 1.2 V)

Percent of V_OUT(NOM)

-20

-10

+10

140

Output Voltage Trim Range¹

Remote Sense Compensation¹

Output Over-Voltage Protection

%

Non-latching (1.5 - 12 V)

117

124

125

132

100

4

%

Non-latching (1.0 - 1.2 V)

%

Auto-Restart Period

Turn-On Time

Applies to all protection features

ms

VDC

Converter Off

Converter On

Converter Off

Converter On

-20

2.4

-20

0.8

20

ON/OFF Control (Positive Logic)

ON/OFF Control (Negative Logic)

20

0.8

¹Vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim from all sources should not

exceed 10% of V_OUT(NOM), in order to insure specified operation of over-voltage protection circuitry. See “Output Voltage Adjust/Trim” for detailed

information.

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3

SQ24 Series

2

OPERATIONS

2.1 INPUT AND OUTPUT IMPEDANCE

These power converters have been designed to be stable with no external capacitors when used in low inductance input and output

circuits.

However, in many applications, the inductance associated with the distribution from the power source to the input of the converter can

affect the stability of the converter. The addition of a 100 µF electrolytic capacitor with an ESR < 1 across the input helps ensure stability

of the converter. In many applications, the user has to use decoupling capacitance at the load. The power converter will exhibit stable

operation with external load capacitance up to 1000 µF on 12 V, 2,200 µF on 8.0 V, 10,000 µF on 5.0 V – 6.0 V, and 15,000 µF on 3.3 V

– 1.0 V outputs.

2.2 ON/OFF (Pin 2)

The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control options

available, positive logic and negative logic and both are referenced to Vin(-). Typical connections are shown in Fig. A.

^TMFamily

Converter

Semi

Q

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

(Top View )

Rload

Vin

SENSE (-)

Vout (-)

CONTROL

INPUT

Fig. A: Circuit configuration for ON/OFF function.

The positive logic version turns on when the ON/OFF pin is at logic high and turns off when at logic low. The converter is on when the

ON/OFF pin is left open.

The negative logic version turns on when the pin is at logic low and turns off when the pin is at logic high. The ON/OFF pin can be hard

wired directly to Vin(-) to enable automatic power up of the converter without the need of an external control signal.

ON/OFF pin is internally pulled-up to 5 V through a resistor. A mechanical switch, open collector transistor, or FET can be used to drive

the input of the ON/OFF pin. The device must be capable of sinking up to 0.2mA at a low level voltage of 0.8V. An external voltage

source (±20V maximum) may be connected directly to the ON/OFF input, in which case it must be capable of sourcing or sinking up to

1mA depending on the signal polarity. See the Start-up Information section for system timing waveforms associated with use of the

ON/OFF pin.

2.3 REMOTE SENSE (PINS 5 AND 7)

The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the

load. The SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should be connected at the load or at the point where regulation is required (see

Fig. B).

^TMFamily

Converter

Rw

Semi

Q

Vout (+)

100

Vin (+)

ON/OFF

Vin (-)

SENSE (+)

TRIM

SENSE (-)

(Top View )

Rload

Vin

10

Vout (-)

Rw

Fig. B: Remote sense circuit configuration.

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SQ24 Series

If remote sensing is not required, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin must be connected

to the Vout(+) pin (Pin 8) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the

converter will deliver an output voltage that is slightly higher than the specified value.

Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces should be

located close to a ground plane to minimize system noise and insure optimum performance. When wiring discretely, twisted pair wires

should be used to connect the sense lines to the load to reduce susceptibility to noise.

The converter’s output over-voltage protection (OVP) senses the voltage across Vout(+) and Vout(-), and not across the sense lines, so

the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent

unwanted triggering of the OVP.

When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the

converter, equal to the product of the nominal output voltage and the allowable output current for the given conditions.

When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order

to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum current (originally

obtained from the derating curves) by the same percentage to ensure the converter’s actual output power remains at or below the

maximum allowable output power.

2.4 OUTPUT VOLTAGE ADJUST/TRIM (PIN 6)

The converter’s output voltage can be adjusted up 10% or down 20% for Vout ≥ 1.5V, and ±10% for Vout = 1.2V and 1.0 V, relative to

the rated output voltage by the addition of an externally connected resistor. For output voltages 3.3V, trim up to 10% is guaranteed only

at Vin ≥ 20V, and it is marginal (8% to 10%) at Vin = 18V depending on load current.

The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 µF capacitor is connected internally

between the TRIM and SENSE(-) pins.

To increase the output voltage, refer to Fig. C. A trim resistor, R_T-INCR, should be connected between the TRIM (Pin 6) and SENSE(+) (Pin

7), with a value of:

5.11(100  Δ)VONOM  626

RTINCR



10.22

[k] (1.5-12 V)

1.225Δ

485

[k] (1.2 V)

R

TINCR



Δ

323

[k] (1.0 V)

R

 2

Δ

where,

RTINCR  _{Required value of trim-up resistor [k]}

VONOM  _{Nominal value of output voltage [V]}

(VO-REQ  VO-NOM)

Δ 

X 100

VO -NOM

[%]

VOREQ  _{Desired (trimmed) output voltage [V].}

When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See previous section for a

complete discussion of this requirement.

^TMFamily

Converter

Semi

Q

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

(Top View )

R

T-INCR

Rload

Vin

SENSE (-)

Vout (-)

Fig. C: Configuration for increasing output voltage.

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SQ24 Series

To decrease the output voltage (Fig. D), a trim resistor, R_T-DECR, should be connected between the TRIM (Pin 6) and SENSE(-) (Pin 5), with

a value of:

511

RTDECR



10.22

[kΩ] (1.0 – 12 V)

| Δ |

where,

RTDECR  ^{Required value of trim-down resistor [k}Ω] and

Δ

is defined above.

Note: The above equations for calculation of trim resistor values match those typically used in conventional industry standard quarter

bricks and one-eighth bricks.

Converters with output voltage 1.2V and 1.0V have specific trim schematic and equations, to provide the customers with the flexibility

of second sourcing. For these converters, the last character of part number is “T”. More information about trim feature, including

corresponding schematic portions, can be found in Application Note 103.

^TMFamily

Converter

Semi

Q

Vin (+)

ON/OFF

Vin (-)

Vout (+)

SENSE (+)

TRIM

(Top View )

Rload

Vin

R ^T-DECR

SENSE (-)

Vout (-)

Fig. D: Configuration for decreasing output voltage.

Trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted

triggering of the output over-voltage protection (OVP) circuit. The designer should ensure that the difference between the voltages across

the converter’s output pins and its sense pins does not exceed 10% of

V_OUT(NOM), or:

[VOUT() VOUT()][VSENSE() VSENSE()]  VO - NOM X10% [V]

This equation is applicable for any condition of output sensing and/or output trim.

3

PROTECTION FEATURES

3.1 INPUT UNDERVOLTAGE LOCKOUT

Input undervoltage lockout is standard with this converter. The converter will shut down when the input voltage drops below a pre-

determined voltage.

The input voltage must be at least 17.5V for the converter to turn on. Once the converter has been turned on, it will shut off when the

input voltage drops below 15V. This feature is beneficial in preventing deep discharging of batteries used in telecom applications.

3.2 OUTPUT OVERCURRENT PROTECTION (OCP)

The converter is protected against overcurrent or short circuit conditions. Upon sensing an overcurrent condition, the converter will

switch to constant current operation and thereby begin to reduce output voltage. When the output voltage drops below 50% of the

nominal value of output voltage, the converter will shut down.

Once the converter has shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% duty cycle. The attempted restart

will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 50% of its nominal

value.

3.3 OUTPUT OVERVOLTAGE PROTECTION (OVP)

The converter will shut down if the output voltage across Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of the OVP circuitry.

The OVP circuitry contains its own reference, independent of the output voltage regulation loop. Once the converter has shut down, it

will attempt to restart every 100 ms until the OVP condition is removed.

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SQ24 Series

3.4 OVERTEMPERATURE PROTECTION (OTP)

The converter will shut down under an overtemperature condition to protect itself from overheating caused by operation outside the

thermal derating curves, or operation in abnormal conditions such as system fan failure. After the converter has cooled to a safe operating

temperature, it will automatically restart.

3.5 SAFETY REQUIREMENTS

The converters meet the requirements of the latest edition and amendment of ITE Safety standards UL/CSA 60950-1.

Basic Insulation is provided between input and output. To comply with safety agencies requirements, an input line fuse must be used

external to the converter. The table below provides the recommended fuse rating for use with this family of products.

OUTPUT VOLTAGE

3.3 V

FUSE RATING

8 A

6 A

4 A

12 V - 5.0 V, 2.5 V

2.0 V - 1.0 V

If one input fuse is used for a group of modules, the maximum fuse rating should not exceed 15-A (SQ modules are UL approved with

up to a 15-A fuse).

3.6 ELECTROMAGNETIC COMPATIBILITY (EMC)

EMC requirements must be met at the end-product system level, as no specific standards dedicated to EMC characteristics of board

mounted component dc-dc converters exist. However, Bel Power Solutions tests its converters to several system level standards,

primary of which is the more stringent EN55022, Information technology equipment - Radio disturbance characteristics - Limits and

methods of measurement.

With the addition of a simple external filter (see application notes), all versions of the SQ24 Series of converters pass the requirements

of Class B conducted emissions per EN55022 and FCC, and meet at a minimum, Class A radiated emissions per EN 55022 and Class

B per FCC Title 47CFR, Part 15-J. Please contact di/dt Applications Engineering for details of this testing.

4

CHARACTERIZATION

GENERAL INFORMATION

4.1

The converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of

ambient temperature and airflow) for vertical and horizontal mounting, efficiency, start-up and shutdown parameters, output ripple and

noise, transient response to load step-change, overload and short circuit.

The figures are numbered as Fig. x.y, where x indicates the different output voltages, and y is associated with a specific plot (y = 1 for

the vertical thermal derating, …). For example, Fig. x.1 will refer to the vertical thermal derating for all the output voltages in general.

The following pages contain specific plots or waveforms associated with the converter. Additional comments for specific data are

provided below.

4.2

TEST CONDITIONS

All data presented were taken with the converter soldered to a test board, specifically a 0.060” thick printed wiring board (PWB) with

four layers. The top and bottom layers were not metalized. The two inner layers, comprising two-ounce copper, were used to provide

traces for connectivity to the converter.

The lack of metalization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the

PWB was minimized. This provides a worst-case but consistent scenario for thermal derating purposes.

All measurements requiring airflow were made in vertical and horizontal wind tunnel facilities using Infrared (IR) thermography and

thermocouples for thermometry.

Ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. If one anticipates operating

the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual operating temperatures in

the application. Thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. Bel Power

Solutions recommends the use of AWG #40 gauge thermocouples to ensure measurement accuracy. Careful routing of the thermocouple

leads will further minimize measurement error. Refer to Figure H for optimum measuring thermocouple location.

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SQ24 Series

4.3 THERMAL DERATING

Load current vs. ambient temperature and airflow rates are given in Fig. x.1 for through-hole version. Ambient temperature was varied

between 25 °C and 85 °C, with airflow rates from 30 to 500 LFM (0.15 to 2.5 m/s), and vertical and horizontal converter mounting.

For each set of conditions, the maximum load current was defined as the lowest of:

(i)

The output current at which any FET junction temperature did not exceed a maximum specified temperature (120 °C) as indicated

by the thermographic image, or

(ii) The nominal rating of the converter (4 A on 12 V, 5.3 A on 8.0 V, 8 A on 6.0 V, 10 A on 5.0 V, and 15 A on 3.3 – 1.0 V).

During normal operation, derating curves with maximum FET temperature less than or equal to 120 °C should not be exceeded.

Temperature on the PCB at the thermocouple location shown in Fig. H should not exceed 118 °C in order to operate inside the derating

curves.

Fig. H: Location of the thermocouple for thermal testing.

4.4 EFFICIENCY

Fig. x.5 shows the efficiency vs. load current plot for ambient temperature of 25 ºC, airflow rate of 300 LFM (1.5 m/s) with vertical

mounting and input voltages of 18 V, 24 V and 36 V. Also, a plot of efficiency vs. load current, as a function of ambient temperature with

Vin = 24 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.6.

4.5 POWER DISSIPATION

Fig. x.7 shows the power dissipation vs. load current plot for Ta = 25 ºC, airflow rate of 300 LFM (1.5 m/s) with vertical mounting and

input voltages of 18 V, 24 V and 36 V. Also, a plot of power dissipation vs. load current, as a function of ambient temperature with Vin =

24 V, airflow rate of 200 LFM (1 m/s) with vertical mounting is shown in Fig. x.8.

4.6 START-UP

Output voltage waveforms, during the turn-on transient using the ON/OFF pin for full rated load currents (resistive load) are shown

without and with external load capacitance in Fig. x.9 and Fig. x.10, respectively.

4.7 RIPPLE AND NOISE

Fig. x.13 shows the output voltage ripple waveform, measured at full rated load current with a 10 µF tantalum and 1 µF ceramic

capacitor across the output. Note that all output voltage waveforms are measured across a 1 F ceramic capacitor.

The input reflected ripple current waveforms are obtained using the test setup shown in Fig x.14. The corresponding waveforms are

shown in Fig. x.15 and Fig. x.16.

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SQ24 Series

4.8 START-UP INFORMATION (USING NEGATIVE ON/OFF)

VIN

Scenario #1: Initial Start-up From Bulk Supply

ON/OFF function enabled, converter started via application of V_IN.

See Figure E.

Time

t₀

Comments

ON/OFF pin is ON; system front end power is toggled

on, V_INto converter begins to rise.

ON/OFF

STATE

t₁

t₂

t₃

V_INcrosses Under-Voltage Lockout protection circuit

threshold; converter enabled.

Converter begins to respond to turn-on command

(converter turn-on delay).

OFF

ON

Converter V_OUTreaches 100% of nominal value.

For this example, the total converter start-up time (t₃- t₁) is typically

4 ms.

VOUT

t

t0

t1 t2

t3

Fig. E: Start-up scenario #1

Scenario #2: Initial Start-up Using ON/OFF Pin

With V_INpreviously powered, converter started via ON/OFF pin.

See Figure F.

VIN

Time

t₀

Comments

V_INPUTat nominal value.

t₁

Arbitrary time when ON/OFF pin is enabled

(converter enabled).

ON/OFF

STATE

t₂

t₃

End of converter turn-on delay.

Converter V_OUTreaches 100% of nominal value.

OFF

ON

For this example, the total converter start-up time (t₃- t₁) is

typically 4 ms.

VOUT

t

t0

t1 t2

t3

Fig. F: Start-up scenario #2.

Scenario #3: Turn-off and Restart Using ON/OFF Pin

IN

V

With V_INpreviously powered, converter is disabled and then

enabled via ON/OFF pin. See Figure G.

Time

t₀

t₁

Comments

V_INand V_OUTare at nominal values; ON/OFF pin ON.

ON/OFF pin arbitrarily disabled; converter output falls to

zero; turn-on inhibit delay period (100 ms typical) is initiated, and

100 ms

ON/OFF

STATE

ON/OFF pin action is internally inhibited. t₂

externally re-enabled.

ON/OFF pin is

OFF

ON

If (t₂- t₁) ≤ 100 ms, external action of ON/OFF pin

is locked out by start-up inhibit timer.

If (t₂- t₁) > 100 ms, ON/OFF pin action is internally

enabled.

OUT

V

t₃

Turn-on inhibit delay period ends. If ON/OFF pin is ON,

converter begins turn-on; if off, converter awaits ON/OFF pin

ON signal; see Figure F. t₄End of converter turn-on delay.

t₅

Converter V_OUTreaches 100% of nominal value. For

t

t1

t2

t3 t4

t5

the condition, (t₂- t₁) ≤ 100 ms, the total converter start-up time

(t₅- t₂) is typically 104 ms. For (t₂- t₁) > 100 ms, start-up will be

typically 4 ms after release of ON/OFF pin.

Fig. G: Start-up scenario #3

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9

SQ24T/S04120 (12.0 V_OUT

)

SQ24 Series

5

ELECTRICAL SPECIFICATIONS: SQ24T/S04120 (12 VOLTS OUT)

Conditions: T_A= 25ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 12 VDC unless otherwise specified.

Input Characteristics

Maximum Input Current

4 ADC, 12 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

3.1

ADC

Input Stand-by Current

3

100

6

mADC

mA_PK-PK

dB

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

120 Hz

TBD

Output Voltage Set Point (no load)

11.88

11.82

0

12.00

±4

12.12

±10

12.18

120

1000

4

VDC

mV

Over Line

Output Regulation

Over Load

±4

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

VDC

mV_PK-PK

μF

90

ADC

A

Non-latching

5

5.5

Non-latching. Short = 10 mΩ.

Non-latching

7.5

10

1

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

1 μF ceramic

150

200

20

mV

µs

Setting Time to 1%

Efficiency

100% Load

87

%

50% Load

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SQ24T/S04120 (12.0 V_OUT

)

SQ24 Series

Ambient Temperature [°C]

Fig. 12V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T04120 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature ≤ 120°C.

Fig. 12V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T04120 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature ≤ 120°C.

Ambient Temperature [°C]

Fig. 12V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S04120 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature ≤ 120°C.

Fig. 12V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S04120 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature ≤ 120°C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

1

2

3

4

5

0

1

2

3

4

5

Load Current [Adc]

Fig. 12V.5: Efficiency vs. load current and input voltage for

SQ24T/S04120 converter mounted vertically with air flowing from

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Fig. 12V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S04120 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

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SQ24T/S04120 (12.0 V_OUT

)

SQ24 Series

10.00

8.00

6.00

4.00

2.00

0.00

10.00

8.00

6.00

4.00

2.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

1

2

3

4

5

0

1

2

3

4

5

Load Current [Adc]

Fig. 12V.7: Power dissipation vs. load current and input voltage

for SQ24T/S04120 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25°C.

Fig. 12V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S04120 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 12V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(5 V/div.). Time scale: 1 ms/div.

Fig. 12V.10: Turn-on transient at full rated load current (resistive)

plus 1,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (5 V/div.).

Time scale: 2 ms/div.

Fig. 12V.11: Output voltage response to load current step-change

(1A – 2A – 1A) at Vin = 24V. Top trace: output voltage (200

mV/div.). Bottom trace: load current (1 A/div.). Current slew rate:

0.1 A/s. Co = 1 F ceramic. Time scale: 0.5 ms/div.

Fig. 12V.12: Output voltage response to load current step-change

(1A – 2A – 1A) at Vin = 24V. Top trace: output voltage (200

mV/div.). Bottom trace: load current (1 A/div.). Current slew rate: 5

A/s. Co = 1 F ceramic. Time scale: 0.5 ms/div.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

12

SQ24T/S04120 (12.0 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ



DC/DC

Converter

Vout

Vsource

Fig. 12V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 12V.13: Output voltage ripple (50 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 12V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 12V.14 for test setup. Time scale: 1 s/div.

Fig. 12V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10H at the source at full rated load current

and Vin = 24V. Refer to Fig. 12V.14 for test setup. Time scale:

1s/div.

15

10

5

0

6

0

1

2

3

4

5

Iout [Adc]

Fig. 12V.18: Load current (top trace, 5 A/div., 20 ms/div.) into a 10

m short circuit during restart, at Vin = 24V. Bottom trace (5

A/div., 1 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 12V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

tech.support@psbel.com

13

SQ24T/S05080 (12.0 V_OUT

)

SQ24 Series

6

ELECTRICAL SPECIFICATIONS: SQ24T/S05080 (8.0 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 8.0 VDC unless otherwise specified.

Input Characteristics

Maximum Input Current

5.3 ADC, 8.0 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

2.8

ADC

Input Stand-by Current

2.6

68

mADC

mA_PK-PK

dB

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

6

120 Hz

TBD

Output Voltage Set Point (no load)

7.92

7.88

8.00

±4

8.08

±10

8.12

VDC

mV

Over Line

Output Regulation

Over Load

±4

mV

Output Voltage Range

Over line, load and temperature (-40ºC to 85ºC)

VDC

Full load + 10 μF tantalum + 1 μF ceramic

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

70

100

2200

5.3

6.75

12

mV_PK-PK

μF

Plus full load (resistive)

0

ADC

A

Current Limit Inception

Non-latching

6.25

10

Peak Short-Circuit Current

RMS Short-Circuit Current

Non-latching. Short=10mΩ.

Non-latching

1

Arms

Dynamic Response

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

160

400

mV

µs

Co = 94 μF tant. + 1 μF ceramic

Setting Time to 1%

Efficiency

100% Load

50% Load

85.5

87

%

6

5

4

3

0.95

0.90

0.85

0.80

0.75

0.70

0.65

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

36 V

24 V

18 V

2

1

0

20

30

40

50

60

70

80

90

0

1

2

3

4

5

6

Ambient Temperature [°C]

Load Current [Adc]

Fig. 8.0V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T05080 converter with D height pins

mounted vertically with Vin = 24 V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 8.0V.2: Efficiency vs. load current and input voltage for

SQ24T/S05080 converter mounted vertically with air flowing from

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

14

SQ24T/S08060 (6.0 V_OUT

)

SQ24 Series

7

ELECTRICAL SPECIFICATIONS: SQ24T/S08060 (6.0 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 6.0 VDC unless otherwise specified.

Input Characteristics

Maximum Input Current

8 ADC, 6.0 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

3.1

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

2.6

88

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

6

120 Hz

TBD

Output Voltage Set Point (no load)

5.940

5.910

0

6.000

±2

6.060

±5

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

6.090

60

VDC

mV_PK-PK

μF

45

10,000

8

ADC

A

Non-latching

10

15

11.5

25

Non-latching. Short=10mΩ.

Non-latching

2.5

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

100

80

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

200

Efficiency

100% Load

89

%

50% Load

tech.support@psbel.com

15

SQ24T/S08060 (6.0 V_OUT

)

SQ24 Series

10

8

6

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

4

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

2

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 6.0V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T08060 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 6.0V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T08060 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

10

8

6

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

4

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

2

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 6.0V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S08060 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 6.0V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S08060 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

0

2

4

6

8

10

Load Current [Adc]

Fig. 6.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S08060 converter mounted vertically with air flowing from

Fig. 6.0V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S08060 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

16

SQ24T/S08060 (6.0 V_OUT

)

SQ24 Series

10.00

8.00

6.00

4.00

2.00

0.00

8.00

6.00

4.00

2.00

0.00

72 V

48 V

36 V

70 C

55 C

40 C

0

2

4

6

8

10

0

2

4

6

8

10

Load Current [Adc]

Fig. 6.0V.7: Power dissipation vs. load current and ambient

Fig. 6.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S08060 converter mounted vertically with

air flowing from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and

Ta = 25C.

temperature for SQ24T/S08060 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 6.0V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(2 V/div.). Time scale: 1 ms/div.

Fig. 6.0V.10: Turn-on transient at full rated load current (resistive)

plus 10,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (2 V/div.).

Time scale: 2 ms/div.

Fig. 6.0V.11: Output voltage response to load current step-change

(2A – 4A – 2A) at Vin = 24V. Top trace: output voltage

(100mV/div.). Bottom trace: load current (2A/div.). Current slew

Fig. 6.0V.12: Output voltage response to load current step-change

(2A – 4A – 2A) at Vin = 24V. Top trace: output voltage

(100mV/div.). Bottom trace: load current (2A/div.). Current slew

rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic. Time scale:

0.2 ms/div.

rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

tech.support@psbel.com

SQ24T/S08060 (6.0 V_OUT

)

17

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 6.0V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 6.0V.13: Output voltage ripple (50 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 6.0V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 6.0V.14 for test setup. Time scale: 1 s/div.

Fig. 6.0V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 6.0V.14 for test setup. Time scale:

1s/div.

8

6

4

2

0

12

0

3

6

9

Iout [Adc]

Fig. 6.0V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 6.0V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

18

SQ24T/S08060 (5.0 V_OUT

)

SQ24 Series

8

ELECTRICAL SPECIFICATIONS: SQ24T/S10050 (5.0 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow=300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 5.0 VDC unless otherwise specified.

Input Characteristics

Maximum Input Current

10 ADC, 5.0 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

3.3

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

3

93

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

120 Hz

TBD

Output Voltage Set Point (no load)

4.950

4.925

0

5.000

±2

5.050

±5

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

5.075

80

VDC

mV_PK-PK

μF

45

10,000

10

ADC

A

Non-latching

12.5

20

14

Non-latching. Short=10 mΩ.

Non-latching

30

3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

140

90

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

200

Efficiency

100% Load

86

87

%

50% Load

tech.support@psbel.com

19

SQ24T/S08060 (5.0 V_OUT

)

SQ24 Series

Ambient Temperature [°C]

Fig. 5.0V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T10050 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 5.0V.2: Available load current vs. ambient air temperature

and airflow rates for SQ24T10050 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Ambient Temperature [°C]

Fig. 5.0V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S10050 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Ambient Temperature [°C]

Fig. 5.0V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S10050 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C..

0.95

0.90

0.85

0.80

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

0

2

4

6

8

10

12

Load Current [Adc]

Fig. 5.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S10050 converter mounted vertically with air flowing from

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 5.0V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S10050 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

20

SQ24T/S08060 (5.0 V_OUT

)

SQ24 Series

10.00

8.00

6.00

4.00

2.00

0.00

10.00

8.00

6.00

4.00

2.00

0.00

70 C

55 C

40 C

36 V

24 V

18 V

0

2

4

6

8

10

12

Load Current [Adc]

0

2

4

6

8

10

12

Fig. 5.0V.8: Power dissipation vs. load current and ambient

Load Current [Adc]

temperature for SQ24T/S10050 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 5.0V.7: Power dissipation vs. load current and input voltage

for SQ24T/S10050 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C..

Fig. 5.0V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(2 V/div.). Time scale: 2 ms/div.

Fig. 5.0V.10: Turn-on transient at full rated load current (resistive)

plus 10,000 F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (2 V/div.).

Time scale: 2 ms/div.

Fig. 5.0V.11: Output voltage response to load current step-change

(2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (2 A/div.). Current slew rate:

0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 5.0V.12: Output voltage response to load current step-change

(2.5A – 5A – 2.5A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (2 A/div.). Current slew rate: 5

A/s. Co = 450 F tantalum + 1 F ceramic. Time scale: 0.2

ms/div.

tech.support@psbel.com

21

SQ24T/S08060 (5.0 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 5.0V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 5.0V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 5.0V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 5.0V.14 for test setup. Time scale: 1 s/div.

Fig. 5.0V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 5.0V.14 for test setup. Time scale:

1s/div.

6.0

5.0

4.0

3.0

2.0

1.0

0

5

10

15

Iout [Adc]

Fig. 5.0V.18: Load current (top trace, 10 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (10

A/div., 1 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 5.0V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

22

SQ24T/S15033 (3.3 V_OUT

)

SQ24 Series

9

ELECTRICAL SPECIFICATIONS: SQ24T/S15033 (3.3 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 3.3 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 3.3 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

3.2

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

3

100

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

120 Hz

TBD

Output Voltage Set Point (no load)

3.267

3.250

0

3.300

±2

3.333

±5

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

3.350

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short=10mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

100

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

Efficiency

100% Load

88

%

50% Load

tech.support@psbel.com

23

SQ24T/S15033 (3.3 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 3.3V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15033 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 3.3V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15033 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 3.3V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15033 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 3.3V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15033 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 3.3V.5: Efficiency vs. load current and input voltage for

SQ24T/S15033 converter mounted vertically with air flowing from

Fig. 3.3V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15033 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

24

SQ24T/S15033 (3.3 V_OUT

)

SQ24 Series

8.00

6.00

4.00

2.00

0.00

8.00

6.00

4.00

2.00

0.00

70 C

55 C

40 C

36 V

24 V

18 V

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 3.3V.8: Power dissipation vs. load current and ambient

Fig. 3.3V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15033 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

temperature for SQ24T/S15033 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 3.3V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(1 V/div.). Time scale: 2 ms/div.

Fig. 3.3V.10: Turn-on transient at full rated load current (resistive)

plus 10,000 F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.).

Time scale: 2 ms/div.

Fig. 3.3V.11: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate:

0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 3.3V.12: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate: 5

A/s. Co = 450 F tantalum + 1 F ceramic. Time scale: 0.2

ms/div.

tech.support@psbel.com

25

SQ24T/S15033 (3.3 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 3.3V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 3.3V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 3.3V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 3.3V.14 for test setup. Time scale: 1 s/div.

Fig. 3.3V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 3.3V.14 for test setup. Time scale:

1s/div.

4

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 3.3V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 1 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 3.3V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

26

SQ24T/S15025 (2.5 V_OUT

)

SQ24 Series

10 ELECTRICAL SPECIFICATIONS: SQ24T/S15025 (2.5 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 2.5 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 2.5 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

2.5

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

3

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

67

6

120 Hz

TBD

Output Voltage Set Point (no load)

2.475

2.500

±2

2.525

±5

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature(-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

2.462

2.538

50

VDC

mV_PK-PK

μF

30

15,000

15

0

ADC

A

Non-latching

18

30

20

Non-latching. Short = 10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic)

110

120

150

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

Efficiency

100% Load

86.5

87

%

50% Load

tech.support@psbel.com

27

SQ24T/S15025 (2.5 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.5V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15025 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 2.5V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15025 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

5

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.5V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15025 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 2.5V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15025 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.5V.5: Efficiency vs. load current and input voltage for

SQ24T/S15025 converter mounted vertically with air flowing from

Fig. 2.5V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15025 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

28

SQ24T/S15025 (2.5 V_OUT

)

SQ24 Series

8.00

6.00

4.00

2.00

0.00

8.00

6.00

4.00

2.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.5V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15025 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 2.5V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15025 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 2.5V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(1 V/div.). Time scale: 1 ms/div.

Fig. 2.5V.10: Turn-on transient at full rated load current (resistive)

plus 10,000 F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.).

Time scale: 1 ms/div.

Fig. 2.5V.11: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 2.5V.12: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic. Time scale:

0.2 ms/div.

tech.support@psbel.com

SQ24T/S15025 (2.5 V_OUT

)

29

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 2.5V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 2.5V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 2.5V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 2.5V.14 for test setup. Time scale: 1 s/div.

Fig. 2.5V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 2.5V.14 for test setup. Time scale:

1s/div.

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 2.5V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 1 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 2.5V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

30

SQ24T/S15020 (2.0 V_OUT

)

SQ24 Series

11 ELECTRICAL SPECIFICATIONS: SQ24T/S15020 (2.0 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 2.0 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 2.0 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

2

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

3

57

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

120 Hz

TBD

Output Voltage Set Point (no load)

1.98

1.970

0

2.000

±2

2.02

±5

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

2.030

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short = 10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

100

120

150

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

Efficiency

100% Load

85

%

50% Load

tech.support@psbel.com

31

SQ24T/S15020 (2.0 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.0V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15020 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 2.0V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15020 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 2.0V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15020 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 2.0V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15020 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S15020 converter mounted vertically with air flowing from

Fig. 2.0V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15020 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

32

SQ24T/S15020 (2.0 V_OUT

)

SQ24 Series

6.00

5.00

4.00

3.00

2.00

1.00

0.00

6.00

5.00

4.00

3.00

2.00

1.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 2.0V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15020 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 2.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15020 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 2.0V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(1 V/div.). Time scale: 1 ms/div.

Fig. 2.0V.10: Turn-on transient at full rated load current (resistive)

plus 10,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.).

Time scale: 1 ms/div.

Fig. 2.0V.11: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate:

0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 2.0V.12: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate: 5

A/s. Co = 450 F tantalum + 1 F ceramic.

Time scale: 0.2 ms/div.

tech.support@psbel.com

33

SQ24T/S15020 (2.0 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 2.0V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 2.0V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 2.0V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and

Vin = 24V. Refer to Fig. 2.0V.14 for test setup.

Time scale: 1 s/div.

Fig. 2.0V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 2.0V.14 for test setup.

Time scale: 1s/div.

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 2.0V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 2.0V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

34

SQ24T/S15018 (1.8 V_OUT

)

SQ24 Series

12 ELECTRICAL SPECIFICATIONS: SQ24T/S15018 (1.8 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 1.8 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 1.8 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

1.8

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

3

53

6

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

120 Hz

TBD

Output Voltage Set Point (no load)

1.782

1.773

0

1.800

±2

1.818

±4

VDC

mV

Over Line

Output Regulation

Over Load

±2

±5

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

1.827

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short = 10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

100

120

150

mV

µs

Co = 450 μF tant. + 1 μF ceramic

Setting Time to 1%

Efficiency

100% Load

84.5

84

%

50% Load

tech.support@psbel.com

35

SQ24T/S15018 (1.8 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.8V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15018 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 1.8V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15018 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.8V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15018 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 1.8V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15018 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.8V.5: Efficiency vs. load current and input voltage for

SQ24T/S15018 converter mounted vertically with air flowing from

Fig. 1.8V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15018 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

36

SQ24T/S15018 (1.8 V_OUT

)

SQ24 Series

6.00

5.00

4.00

3.00

2.00

1.00

0.00

6.00

5.00

4.00

3.00

2.00

1.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.8V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15018 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 1.8V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15018 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 1.8V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(1 V/div.). Time scale: 1 ms/div.

Fig. 1.8V.10: Turn-on transient at full rated load current (resistive)

plus 10,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (1 V/div.).

Time scale: 1 ms/div.

Fig. 1.8V.11: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate:

0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 1.8V.12: Output voltage response to load current step-change

(3.75A – 7.5A – 3.75A) at Vin = 24V. Top trace: output voltage (100

mV/div.). Bottom trace: load current (5 A/div.). Current slew rate: 5

A/s. Co = 450 F tantalum + 1 F ceramic. Time scale: 0.2

ms/div.

tech.support@psbel.com

37

SQ24T/S15018 (1.8 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 1.8V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 1.8V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 1.8V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.8V.14 for test setup. Time scale: 1 s/div.

Fig. 1.8V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.8V.14 for test setup. Time scale:

1s/div.

3

2

1

0

20

0

5

10

15

Iout [Adc]

Fig. 1.8V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 1.8V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

38

SQ24T/S15015 (1.5 V_OUT

)

SQ24 Series

13 ELECTRICAL SPECIFICATIONS: SQ24T/S15015 (1.5 VOLTS OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 1.5 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 1.5 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

1.6

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

2.6

48

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

6

120 Hz

TBD

Output Voltage Set Point (no load)

1.485

1.477

0

1.500

±2

1.515

±4

VDC

mV

Over Line

Output Regulation

Over Load

±2

±4

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

1.523

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short = 10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

80

mV

µs

Co = 450 μF tant. + 1 μF ceramic

120

170

Setting Time to 1%

Efficiency

100% Load

83

%

50% Load

tech.support@psbel.com

39

SQ24T/S15015 (1.5 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.5V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15015 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 1.5V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15015 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.5V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15015 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 1.5V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15015 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.5V.5: Efficiency vs. load current and input voltage for

SQ24T/S15015 converter mounted vertically with air flowing from

Fig. 1.5V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15015 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

40

SQ24T/S15015 (1.5 V_OUT

)

SQ24 Series

6.00

5.00

4.00

3.00

2.00

1.00

0.00

6.00

5.00

4.00

3.00

2.00

1.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.5V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15015 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 1.5V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15015 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 1.5V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.5V.10: Turn-on transient at full rated load current (resistive)

plus 10,000 F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (0.5

V/div.). Time scale: 1 ms/div.

Fig. 1.5V.11: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 1.5V.12: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic. Time scale:

0.2 ms/div.

tech.support@psbel.com

41

SQ24T/S15015 (1.5 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 1.5V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 1.5V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 1.5V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.5V.14 for test setup. Time scale: 1 s/div.

Fig. 1.5V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.5V.14 for test setup. Time scale:

1s/div.

2.0

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.5V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 1.5V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

42

SQ24T/S15012 (1.2 V_OUT

)

SQ24 Series

14 ELECTRICAL SPECIFICATIONS: SQ24T/S15012 (1.2 VOLTS OUT)

Conditions: T_A= 25ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 1.2 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 1.2 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

1.25

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

2.6

43

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

6

120 Hz

TBD

Output Voltage Set Point (no load)

1.188

1.182

0

1.200

±1

1.212

±3

VDC

mV

Over Line

Output Regulation

Over Load

±1

±3

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC)

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

1.218

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short=10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

90

mV

µs

Co = 450 μF tant. + 1 μF ceramic

120

200

Setting Time to 1%

Efficiency

100% Load

81

%

50% Load

tech.support@psbel.com

43

SQ24T/S15012 (1.2 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.2V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15012 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 1.2V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15012 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.2V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15012 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 1.2V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15012 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.2V.5: Efficiency vs. load current and input voltage for

SQ24T/S15012 converter mounted vertically with air flowing from

Fig. 1.2V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15012 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

44

SQ24T/S15012 (1.2 V_OUT

)

SQ24 Series

6.00

5.00

4.00

3.00

2.00

1.00

0.00

6.00

5.00

4.00

3.00

2.00

1.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.2V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15012 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 1.2V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15012 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 1.2V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.2V.10: Turn-on transient at full rated load current (resistive)

plus 10,000 F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (0.5 V/div.).

Time scale: 1 ms/div.

Fig. 1.2V.11: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 0.1 A/s. Co = 1 F ceramic. Time scale: 0.2 ms/div.

Fig. 1.2V.12: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic. Time scale:

0.2 ms/div.

tech.support@psbel.com

45

SQ24T/S15012 (1.2 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 1.2V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 1.2V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 1.2V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.2V.14 for test setup. Time scale: 1 s/div.

Fig. 1.2V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.2V.14 for test setup. Time scale:

1s/div.

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.2V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 1.2V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

46

SQ24T/S15010 (1.0 V_OUT

)

SQ24 Series

15 ELECTRICAL SPECIFICATIONS: SQ24T/S15010 (1.0 VOLT OUT)

Conditions: T_A= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24 VDC, Vout = 1.0 VDC unless otherwise specified.

PARAMETER

NOTES

MIN

TYP

MAX

UNITS

Input Characteristics

Maximum Input Current

15 ADC, 1.0 VDC Out @ 18 VDC In

Vin = 24 V, converter disabled

Vin = 24 V, converter enabled

25 MHz bandwidth

1.1

ADC

mADC

mA_PK-PK

dB

Input Stand-by Current

2.6

43

Input No Load Current (0 load on the output)

Input Reflected-Ripple Current

Input Voltage Ripple Rejection

Output Characteristics

7.5

120 Hz

TBD

Output Voltage Set Point (no load)

0.990

0.985

0

1.000

±1

1.010

±2

VDC

mV

Over Line

Output Regulation

Over Load

±1

±3

mV

Output Voltage Range

Output Ripple and Noise - 25 MHz bandwidth

External Load Capacitance

Output Current Range

Current Limit Inception

Peak Short-Circuit Current

RMS Short-Circuit Current

Dynamic Response

Over line, load and temperature (-40ºC to 85ºC )

Full load + 10 μF tantalum + 1 μF ceramic

Plus full load (resistive)

1.015

50

VDC

mV_PK-PK

μF

30

15,000

15

ADC

A

Non-latching

18

30

20

Non-latching. Short = 10 mΩ.

Non-latching

40

5.3

Arms

Load Change 25% of Iout Max, di/dt = 0.1 A/μs

di/dt = 5 A/μs

Co = 1 μF ceramic

80

mV

µs

Co = 450 μF tant. + 1 μF ceramic

140

180

Setting Time to 1%

Efficiency

100% Load

79

%

50% Load

tech.support@psbel.com

47

SQ24T/S15010 (1.0 V_OUT

)

SQ24 Series

20

15

10

20

15

10

5

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

30 LFM (0.15 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.0V.1: Available load current vs. ambient air temperature and

airflow rates for SQ24T15010 converter with B height pins

mounted vertically with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

Fig. 1.0V.2: Available load current vs. ambient air temperature and

airflow rates for SQ24T15010 converter with B height pins

mounted horizontally with Vin = 24V, air flowing from pin 3 to pin 1

and maximum FET temperature  120C.

20

15

10

20

15

10

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

500 LFM (2.5 m/s)

400 LFM (2.0 m/s)

300 LFM (1.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

200 LFM (1.0 m/s)

100 LFM (0.5 m/s)

5

30 LFM (0.15 m/s)

0

20

30

40

50

60

70

80

90

20

30

40

50

60

70

80

90

Ambient Temperature [°C]

Fig. 1.0V.3: Available load current vs. ambient temperature and

airflow rates for SQ24S15010 converter mounted vertically with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

Fig. 1.0V.4: Available load current vs. ambient temperature and

airflow rates for SQ24S15010 converter mounted horizontally with

Vin = 24V, air flowing from pin 3 to pin 1 and maximum FET

temperature  120C.

0.95

0.90

0.85

0.80

0.95

0.90

0.85

0.80

36 V

24 V

18 V

70 C

55 C

40 C

0.75

0.70

0.65

0.70

0.65

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.0V.5: Efficiency vs. load current and input voltage for

SQ24T/S15010 converter mounted vertically with air flowing from

Fig. 1.0V.6: Efficiency vs. load current and ambient temperature

for SQ24T/S15010 converter mounted vertically with Vin = 24V

and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).

pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

48

SQ24T/S15010 (1.0 V_OUT

)

SQ24 Series

6.00

5.00

4.00

3.00

2.00

1.00

0.00

6.00

5.00

4.00

3.00

2.00

1.00

0.00

36 V

24 V

18 V

70 C

55 C

40 C

0

2

4

6

8

10

12

14

16

0

2

4

6

8

10

12

14

16

Load Current [Adc]

Fig. 1.0V.7: Power dissipation vs. load current and input voltage

for SQ24T/S15010 converter mounted vertically with air flowing

from pin 3 to pin 1 at a rate of 300 LFM (1.5 m/s) and Ta = 25C.

Fig. 1.0V.8: Power dissipation vs. load current and ambient

temperature for SQ24T/S15010 converter mounted vertically with

Vin = 24V and air flowing from pin 3 to pin 1 at a rate of 200 LFM

(1.0 m/s).

Fig. 1.0V.9: Turn-on transient at full rated load current (resistive)

with no output capacitor at Vin = 24V, triggered via ON/OFF pin.

Top trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage

(0.5 V/div.). Time scale: 1 ms/div.

Fig. 1.0V.10: Turn-on transient at full rated load current (resistive)

plus 10,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (0.5

V/div.). Time scale: 1 ms/div.

Fig. 1.0V.10: Turn-on transient at full rated load current (resistive)

plus 10,000F at Vin = 24V, triggered via ON/OFF pin. Top trace:

ON/OFF signal (5 V/div.). Bottom trace: output voltage (0.5 V/div.).

Time scale: 1 ms/div.

Fig. 1.0V.12: Output voltage response to load current step-change

(3.75 A – 7.5 A – 3.75 A) at Vin = 24V. Top trace: output voltage

(100 mV/div.). Bottom trace: load current (5 A/div.). Current slew

rate: 5 A/s. Co = 450 F tantalum + 1 F ceramic. Time scale:

0.2 ms/div.

tech.support@psbel.com

49

SQ24T/S15010 (1.0 V_OUT

)

SQ24 Series

i_S

i_C

10 H

source

inductance

TM

33 F

ESR <1

electrolytic

capacitor

1 F

ceramic

capacitor

Family

SemiQ

DC/DC

Converter



Vout

Vsource

Fig. 1.0V.14: Test setup for measuring input reflected ripple

currents, ic and is.

Fig. 1.0V.13: Output voltage ripple (20 mV/div.) at full rated load

current into a resistive load with Co = 10 F tantalum + 1uF

ceramic and Vin = 24 V. Time scale: 1 s/div.

Fig. 1.0V.15: Input reflected ripple current, ic (100 mA/div.),

measured at input terminals at full rated load current and Vin =

24V. Refer to Fig. 1.0V.14 for test setup. Time scale: 1 s/div.

Fig. 1.0V.16: Input reflected ripple current, is (10 mA/div.),

measured through 10 H at the source at full rated load current

and Vin = 24V. Refer to Fig. 1.0V.14 for test setup. Time scale:

1s/div.

1.5

1.0

0.5

0

20

0

5

10

15

Iout [Adc]

Fig. 1.0V.18: Load current (top trace, 20 A/div., 20 ms/div.) into a

10 m short circuit during restart, at Vin = 24V. Bottom trace (20

A/div., 2 ms/div.) is an expansion of the on-time portion of the top

trace.

Fig. 1.0V.17: Output voltage vs. load current showing current limit

point and converter shutdown point. Input voltage has almost no

effect on current limit characteristic.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB

50

SQ24 Series

16 MECHANICAL SPECIFICATIONS

SQ24S Platform Notes

•

All dimensions are in inches [mm]

Connector Material: Copper

Connector Finish: Gold over Nickel

Optional: Tin/Lead over Nickel

Converter Weight: 0.53 oz [15 g]

Recommended Surface-Mount Pads:

o

Min. 0.080” X 0.112” [2.03 x 2.84]

Max. 0.092” X 0.124” [2.34 x 3.15]

PAD / PIN CONNECTIONS

Pad/Pin #

Function

Vin (+)

1

2

3

4

5

6

7

8

ON/OFF

Vin (-)

Vout (-)

SENSE(-)

TRIM

SQ24S Pinout (Surface Mount)

SENSE(+)

Vout (+)

HT

CL

(Max. Height)

+0.000 [+0.00] -

0.038 [- 0.97]

(Min. Clearance)

+0.016 [+0.41] -

0.000 [- 0.00]

Height

Option

A

B

C

D

E

0.319 [8.10]

0.352 [8.94]

0.516 [13.11]

0.416 [10.57]

0.298 [7.57]

0.030 [0.77]

0.063 [1.60]

0.227 [5.77]

0.127 [3.23]

0.009 [0.23]

PL Pin Length

Pin Option

±0.005 [±0.13]

0.188 [4.77]

0.145 [3.68]

0.110 [2.79]

A

B

C

SQ24T Platform Notes

•

All dimensions are in inches [mm]

Pins 1-3 and 5-7 are Ø 0.040” [1.02] with Ø

0.078” [1.98] shoulder

SQ24T Pinout (Through-hole)

•

Pins 4 and 8 are Ø 0.062” [1.57] without

shoulder

Pin Material and Finish: CDA 360 (brass) with

200-300 u" matte SN over 100-150 u" N

Converter Weight: 0.53 oz [15 g]

tech.support@psbel.com

51

SQ24 Series

17 CONVERTER PART NUMBERING / ORDERING INFORMATION

Maximum

Height

[HT]

Length

[PL]

Product

Series

Input

Voltage

Mounting

Scheme

Rated Load

Current

Output

Voltage

ON/OFF

Logic

Special

Features

RoHS

SQ

24

S

05

080

-

N

S

0

15  15 A

(1.0 – 3.3 V)

S 

010  1.0 V

012  1.2 V

015  1.5 V

018  1.8 V

020  2.0 V

025  2.5 V

033  3.3 V

050  5.0 V

060  6.0 V

080  8.0 V

120  12.0 V

No Suffix 

RoHS

lead-solder-

exemption

compliant

Optional

Connector

Finish:

Tin/Lead

over Nickel

10  10 A

(5.0 V)

N 

Negative

1/8^th

Brick

Format

S 

Surface

Mount

SMT

S  0.289”

SMT

0  0.00”

18-36 V

08  8 A

(6.0 V)

0  STD

P 

Positive

G  RoHS

compliant

for all six

05  5.3 A

(8.0 V)

T  Special

Trim²

(For 1.2V &

1.0V only)

substances

04  4 A

(12.0 V)

Product

Series³

Input

Voltage

Mounting

Scheme

Rated Load

Current

Output

Voltage

ON/OFF

Logic

Maximum

Height [HT]

Length [PL]

Special

Features

RoHS

SQ

24

T

05

080

-

N

B

A

0

0  STD

15  15 A

(1.0 – 3.3 V)

010  1.0 V

012  1.2 V

015  1.5 V

018  1.8 V

020  2.0 V

025  2.5 V

033  3.3 V

050  5.0 V

060  6.0 V

080  8.0 V

120  12.0 V

No Suffix 

RoHS

T 

Special

Trim²

lead-solder-

exemption

compliant

10  10 A

(5.0 V)

Through hole

N 

Negative

(For 1.2V &

1.0V only)

1/8^th

Brick

Format

A  0.319”

B  0.352”

C  0.516”

D  0.416”

E  0.298”

T

Through-

hole

A  0.188”

B  0.145”

C  0.110”

18-36 V

08  8 A

(6.0 V)

P 

Positive

H 

Flexible

termination

of C406

(max height

2.5 mm)

G  RoHS

compliant

for all six

05  5.3 A

(8.0 V)

substances

04  4 A

(12.0 V)

1

The example above describes P/N SQ24T05080-NBA0: 18-36 V input, through-hole mounting, 5.3 A @ 8.0 V output, negative ON/OFF logic,

a maximum height of 0.352”, a through the board pin length of 0.188”, and RoHS lead-solder-exemption compliancy. Please consult factory

regarding availability of a specific version.

For definitions, operation, and associated trim equations for all trim options please refer to Application Note 103, Trim Feature for Isolated

DC-DC converters.

2

3

All possible option combinations are not necessarily available for every model. Contact Customer Service to confirm availability.

Model numbers highlighted in yellow or shaded are not recommended for new designs.

NUCLEAR AND MEDICAL APPLICATIONS - Products are not designed or intended for use as critical components in life support systems,

equipment used in hazardous environments, or nuclear control systems.

TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on

the date manufactured. Specifications are subject to change without notice.

North America

+1 408 785 5200

Asia-Pacific

+86 755 298 85888

Europe, Middle East

+353 61 225 977

BCD.00706_AB


型号：	SQ24T10050-NEC0G
厂家：	BEL FUSE INC.
描述：	DC-DC Regulated Power Supply Module, 1 Output, 50W, Hybrid, EIGHTH BRICK PACKAGE-8 输入元件输出元件
文件：	总51页 (文件大小：2437K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SQ24T10050-NEC0G [BEL]

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