SQ24S03150-NS0S [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid;
| 型号： | SQ24S03150-NS0S |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid |
| 文件： | 总15页 (文件大小：473K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SQ24T/S03150
Data Sheet
19-36 Vdc Input, 3.3 A, 15 Vdc Output
The new SemiQ™ Family of DC/DC converters from di/dt
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, the thermal performance
of SemiQ™ converters exceeds that of most competitors'
quarter bricks. This is accomplished through the use of pat-
ent pending circuit, packaging and processing techniques to
achieve ultra-high efficiency, excellent thermal management
and a very low body profile.
SQ24T03150 and SQ24S03150 Converters
Low body profile and the preclusion of heatsinks minimize
airflow shadowing, thus enhancing cooling for downstream
devices. The use of 100% automation for assembly, coupled
with di/dt’s advanced electrical and thermal design, results in
a product with extremely high reliability.
Features
•
•
•
Delivers up to 3.3 A @ 15 V
Industry-standard quarter brick pinout
Extremely small footprint: 0.896” x 2.30” (2.06 in2),
40% smaller than conventional quarter bricks
Higher current capability at elevated temperatures
than most competitors' quarter bricks
On-board input differential LC-filter
High efficiency – no heatsink required
Start up into pre-biased output
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 de-
signs 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 improve-
ment over other available converters because of the SQ24
Series’ optimized thermal efficiency.
No minimum load required
Available in through-hole and SM packages
Lowest profile in industry: 0.274” (6.96 mm)
Lowest weight in industry: 0.53 oz (15 g)
Meets Basic Insulation requirements of EN60950
Fixed frequency operation
Fully protected
Remote output sense
Output voltage trim range: +10%/−20% 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
UL 60950 recognized in US and Canada and DEMKO
certified per IEC/EN 60950
Applications
•
•
•
•
Telecommunications
Datacommunications
Wireless
•
Servers
•
•
•
•
Meets conducted emissions requirements of FCC
Class B and EN 55022 Class B with external filter
All materials meet UL94, V-0 flammability rating
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Electrical Specifications
Conditions: TA=25ºC, 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
-55
40
85
125
Vdc
°C
°C
Operating Ambient Temperature
Storage Temperature
INPUT CHARACTERISTICS
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
19
24
36
Vdc
Non-latching
16
15
17
16
17.5
16.5
Vdc
Vdc
Turn-off Threshold
ISOLATION CHARACTERISTICS
I/O Isolation
2000
10
Vdc
pF
Isolation Capacitance:
Isolation Resistance
230
415
MΩ
FEATURE CHARACTERISTICS
Switching Frequency
kHz
%
%
%
ms
ms
Output Voltage Trim Range1
Remote Sense Compensation1
Output Over-Voltage Protection
Auto-Restart Period
Industry-std. equations
Percent of VOUT(NOM)
Non-latching
-20
+10
+10
140
117
125
100
4
Applies to all protection features
Turn-On Time
ON/OFF Control (Positive Logic)
Converter Off
-20
2.4
0.8
20
Vdc
Vdc
Converter On
ON/OFF Control (Negative Logic)
Converter Off
2.4
-20
20
0.8
Vdc
Vdc
Converter On
Additional Notes:
1. Vout can be increased up to 10% via the sense leads or up to 10% via the trim function for Vin > 21 V, however total output voltage trim from
all sources should not exceed 10% of VOUT(NOM), in order to insure specified operation of over-voltage protection circuitry. Vout can be increased
up to 5% for Vin > 20V.
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Electrical Specifications (continued)
Conditions: TA=25ºC, Airflow=300 LFM (1.5 m/s), Vin=24 Vdc, Vout=15 Vdc unless otherwise specified.
PARAMETER
NOTES
MIN
TYP
MAX UNITS
INPUT CHARACTERISTICS
Maximum Input Current
3.3 Adc, 15 Vdc Out @ 19 Vdc In
Vin = 24 V, converter disabled
Vin = 24 V, converter enabled
25MHz bandwidth
3.2
Adc
mAdc
mAdc
mAPK-PK
dB
Input Stand-by Current
3
105
7
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
120Hz
TBD
OUTPUT CHARACTERISTICS
Output Voltage Set Point (no load)
Output Regulation
14.850
15.000
15.150
Vdc
Over Line
±4
±4
±10
±10
15.225
140
1000
3.3
mV
mV
Vdc
mVPK-PK
µF
Over Load
Output Voltage Range
Output Ripple and Noise - 25MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
Plus full load (resistive)
14.775
0
110
Adc
Adc
A
Non-latching
Non-latching. Short=10mꢀ
Non-latching
4
12
0.75
4.5
15
Arms
DYNAMIC RESPONSE
Load Change 25% of Iout Max, di/dt = 0.1 A/µS
di/dt = 5 A/µS
Co = 1 µF ceramic
200
150
mV
mV
Co = 47 µF tant. + 1 µF ceramic
Setting Time to 1%
Load Change (25%-75%-25%), di/dt = 5 A/µS
Co = 47 µF tant. + 1 µF ceramic
150
µs
EFFICIENCY
100% Load
89
88
%
%
50% Load
Additional Notes: 2.
-40ºC to 85ºC
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
age of ≤ 0.8 V. An external voltage source of ±20 V max.
may be connected directly to the ON/OFF input, in which
case it should be capable of sourcing or sinking up to 1 mA
depending on the signal polarity. See the Start-up Informa-
tion section for system timing waveforms associated with
use of the ON/OFF pin.
Operation
Input and Output Impedance
These power converters have been designed to be stable
with no external capacitors when used in low inductance in-
put and output circuits.
Remote Sense (Pins 5 and 7)
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 addi-
tion of a 100 µF electrolytic capacitor with an ESR < 1 Ω
across the input helps ensure stability of the converter. In
many applications, the user has to use decoupling capaci-
tance at the load. The power converter will exhibit stable op-
eration with external load capacitance up to 1000 µF.
The remote sense feature of the converter compensates for
voltage drops occurring between the output pins of the con-
verter 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).
TM
Rw
Family
Semi
Q
Vout (+)
100
Vin (+)
ON/OFF
Vin (-)
Converter
ON/OFF (Pin 2)
SENSE (+)
(Top View)
Rload
TRIM
Vin
The ON/OFF pin is used to turn the power converter on or
off remotely via a system signal. There are two remote con-
trol options available, positive logic and negative logic and
both are referenced to Vin(-). Typical connections are shown
in Fig. A.
SENSE (-)
10
Vout (-)
Rw
Fig. B: Remote sense circuit configuration.
TM
Family
SemCoiQnverter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
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.
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
CONTROL
INPUT
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.
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 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.
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.
When utilizing the remote sense feature, care must be taken
not to exceed the maximum allowable output power capabil-
ity of the converter, equal to the product of the nominal out-
put voltage and the allowable output current for the given
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 0.2 mA at a low level volt-
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
conditions.
TM
Family
SemCoiQnverter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
When using remote sense, the output voltage at the con-
verter can be increased by as much as 10% above the
SENSE (+)
TRIM
(Top View)
R T-INCR
Rload
nominal rating in order to maintain the required voltage
Vin
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 con-
verter’s actual output power remains at or below the maxi-
mum allowable output power.
SENSE (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
Output Voltage Adjust /TRIM (Pin 6)
To decrease the output voltage (Fig. D), a trim resistor,
RT-DECR, should be connected between the TRIM (Pin 6) and
SENSE(-) (Pin 5), with a value of:
The converter’s output voltage can be adjusted up 10% or
down 20% relative to the rated output voltage by the addition
of an externally connected resistor. Trim up to 10% is guar-
anteed only at Vin ≥ 21 V, and to 5% is guaranteed only at
Vin ≥ 20 V.
511
RT−DECR
=
−10.22 [kΩ]
| ∆ |
The TRIM pin should be left open if trimming is not being
used. To minimize noise pickup, a 0.1 µF capacitor is con-
nected internally between the TRIM and SENSE(-) pins.
where,
RT−DECR = Required value of trim-down resistor [kΩ]
and ∆ is as defined above.
To increase the output voltage, refer to Fig. C. A trim resis-
tor, RT-INCR, should be connected between the TRIM (Pin 6)
and SENSE(+) (Pin 7), with a value of:
Note: The above equations for calculation of trim resistor
values match those typically used in conventional industry-
standard quarter bricks and one-eighth brick. For more in-
formation, see Application Note 103.
5.11(100 + ∆)VO−NOM − 626
RT−INCR
=
− 10.22 [kΩ]
1.225∆
where,
TM
Family
SemCoiQnverter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
RT−INCR = Required value of trim-up resistor kΩ]
VO−NOM = Nominal value of output voltage [V]
(Top View)
Rload
Vin
RT-DECR
SENSE (-)
Vout (-)
(VO-REQ − VO-NOM)
∆ =
X 100 [%]
VO -NOM
VO−REQ = Desired (trimmed) output voltage [V].
Fig. D: Configuration for decreasing output voltage.
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.
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 protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 10% of VOUT(NOM),
or:
[VOUT(+) − VOUT(−)]−[VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10% [V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Safety Requirements
Protection Features
Input Under-Voltage Lockout
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
Input under-voltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. A 6-A fuse is
recommended for use with this product.
The input voltage must be at least 17.5 V for the converter to
turn on. Once the converter has been turned on, it will shut
off when the input voltage drops below 15 V. This feature is
beneficial in preventing deep discharging of batteries used in
telecom applications.
If one input fuse is used for a group of modules, the maxi-
mum fuse rating should not exceed 15-A (SQ modules are
UL approved with up to a 15-A fuse).
Electromagnetic Compatibility (EMC)
Output Over-Current Protection (OCP)
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC character-
istics of board mounted component dc-dc converters exist.
However, di/dt tests its converters to several system level
standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio disturbance char-
acteristics - Limits and methods of measurement.
The converter is protected against over-current or short cir-
cuit conditions. Upon sensing an over-current 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 volt-
age, 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.
With the addition of a simple external filter (see application
notes), all versions of the SQ Series of converters pass the
requirements of Class B conducted emissions per EN55022
and FCC, and meet at a minimum, Class A radiated emis-
sions per EN 55022 and Class B per FCC Title 47CFR, Part
15-J. Please contact di/dt Applications Engineering for de-
tails of this testing.
Output Over-Voltage 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 refer-
ence, 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.
Over-Temperature Protection (OTP)
The converter will shut down under an over-temperature
condition to protect itself from overheating caused by opera-
tion outside the thermal derating curves, or operation in ab-
normal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
85°C, with airflow rates from 30 to 500 LFM (0.15 to 2.5
Characterization
General Information
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 either any FET junction tem-
perature did not exceed a maximum specified temperature
(120°C) as indicated by the thermographic image, or
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.
(ii) The nominal rating of the converter (3.3 A).
During normal operation, derating curves with maximum FET
temperature less than or equal to 120°C should not be ex-
ceeded. Temperature on the PCB at the thermocouple loca-
tion shown in Fig. H should not exceed 118°C in order to
operate inside the derating curves.
The following pages contain specific plots or waveforms as-
sociated with the converter. Additional comments for specific
data are provided below.
Efficiency
Test Conditions
Fig. 5 shows the efficiency vs. load current plot for ambient
temperature of 25ºC, 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. 6.
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 cop-
per, were used to provide traces for connectivity to the con-
verter.
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 pur-
poses.
Power Dissipation
Fig. 7 shows the power dissipation vs. load current plot for
Ta = 25ºC, 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. 8.
All measurements requiring airflow were made in di/dt’s ver-
tical 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 an-
ticipates 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. Thermo-
graphic imaging is preferable; if this capability is not avail-
able, then thermocouples may be used. di/dt recommends
the use of AWG #40 gauge thermocouples to ensure meas-
urement accuracy. Careful routing of the thermocouple leads
will further minimize measurement error. Refer to Figure H
for optimum measuring thermocouple location.
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. 9 and Fig. 10, respectively.
Ripple and Noise
Fig. 13 shows the output voltage ripple waveform, measured
at full rated load current with a 10 µF tantalum and 1 µF ce-
ramic capacitor across the output. Note that all output volt-
age waveforms are measured across a 1 µF ceramic capaci-
tor.
The input reflected ripple current waveforms are obtained
using the test setup shown in Fig 14. The corresponding
waveforms are shown in Fig. 15 and Fig. 16.
Thermal Derating
Load current vs. ambient temperature and airflow rates are
given in Fig. 1 to Fig. 4 for through-hole and surface mount
version. Ambient temperature was varied between 25°C and
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
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 VIN.
See Figure E.
Time
Comments
ON/OFF
STATE
t0
ON/OFF pin is ON; system front end power is toggled
on, VIN to converter begins to rise.
OFF
ON
t1
t2
t3
VIN crosses Under-Voltage Lockout protection circuit
threshold; converter enabled.
Converter begins to respond to turn-on command (con-
verter turn-on delay).
VOUT
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
t
t0
t1 t2
t3
Fig. E: Start-up scenario #1
Scenario #2: Initial Start-up Using ON/OFF Pin
With VIN previously powered, converter started via ON/OFF pin.
See Figure F.
VIN
Time
Comments
t0
t1
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled (converter
enabled).
ON/OFF
STATE
OFF
ON
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
For this example, the total converter start-up time (t3- t1) is typically
4 ms.
VOUT
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and then en-
abled via ON/OFF pin. See Figure G.
t
t0
t1 t2
t3
Time
Comments
Fig. F: Start-up scenario #2.
t0
t1
VIN and VOUT are 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 ON/OFF pin action is internally inhibited.
ON/OFF pin is externally re-enabled.
VIN
t2
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.
100 ms
ON/OFF
STATE
OFF
ON
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.
t4
t5
End of converter turn-on delay.
VOUT
Converter VOUT reaches 100% of nominal value.
For 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.
t
t0
t1
t2
t3 t4
t5
Fig. G: Start-up scenario #3.
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SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
4
3
2
1
0
4
3
2
1
0
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)
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)
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 2: Available load current vs. ambient air temperature and
airflow rates for SQ24T03150 converter with B height pins
mounted horizontally with Vin = 24 V, air flowing from pin 3 to
pin 1 and maximum FET temperature ≤ 120°C.
Fig. 1: Available load current vs. ambient air temperature and
airflow rates for SQ24T03150 converter with B height pins
mounted vertically with Vin = 24 V, air flowing from pin 3 to pin
1 and maximum FET temperature ≤ 120°C.
4
3
2
4
3
2
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)
200 LFM (1.0 m/s)
1
1
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
100 LFM (0.5 m/s)
30 LFM (0.15 m/s)
0
0
20
30
40
50
60
70
80
90
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 4: Available load current vs. ambient temperature and air-
flow rates for SQ24S03150 converter mounted horizontally with
Vin = 24 V, air flowing from pin 3 to pin 1 and maximum FET
temperature ≤ 120°C.
Fig. 3: Available load current vs. ambient temperature and air-
flow rates for SQ24S03150 converter mounted vertically with
Vin = 24 V, air flowing from pin 3 to pin 1 and maximum FET
temperature ≤ 120°C.
SQ24x03150 FDS Ver 4 01-21-04
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Page 9 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.95
0.90
0.85
0.80
0.75
0.70
0.65
36 V
24 V
18 V
70 C
55 C
40 C
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Load Current [Adc]
Load Current [Adc]
Fig. 5: Efficiency vs. load current and input voltage for
SQ24T/S03150 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. 6: Efficiency vs. load current and ambient temperature for
SQ24T/S03150 converter mounted vertically with Vin = 24 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0
m/s).
8.00
6.00
4.00
8.00
6.00
4.00
70 C
55 C
40 C
36 V
24 V
18 V
2.00
2.00
0.00
0.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Load Current [Adc]
Load Current [Adc]
Fig. 8: Power dissipation vs. load current and ambient tem-
perature for SQ24T/S03150 converter mounted vertically with
Vin = 24 V and air flowing from pin 3 to pin 1 at a rate of 200
LFM (1.0 m/s).
Fig. 7: Power dissipation vs. load current and input voltage for
SQ24T/S03150 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.
SQ24x03150 FDS Ver 4 01-21-04
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Page 10 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Fig. 9: Turn-on transient at full rated load current (resistive)
with no output capacitor at Vin = 24 V, 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. 10: Turn-on transient at full rated load current (resistive)
plus 1,000 µF at Vin = 24 V, triggered via ON/OFF pin. Top
trace: ON/OFF signal (5 V/div.). Bottom trace: output voltage
(5 V/div.). Time scale: 5 ms/div.
Fig. 11: Output voltage response to load current step-change
(0.825 A – 1.65 A – 0.825 A) at Vin = 24 V. Top trace: output
voltage (200 mV/div.). Bottom trace: load current (1 A/div.).
Current slew rate: 0.1 A/µs. Co = 1 µF ceramic. Time scale: 0.5
ms/div.
Fig. 12: Output voltage response to load current step-change
(0.825 A – 1.65 A – 0.825 A) at Vin = 24 V. Top trace: output
voltage (200 mV/div.). Bottom trace: load current (1 A/div.).
Current slew rate: 5 A/µs. Co = 47 µF tantalum + 1 µF ceramic.
Time scale: 0.5 ms/div.
SQ24x03150 FDS Ver 4 01-21-04
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Page 11 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
iS
iC
10 µH
source
TM
33 µF
1 µF
Family
Semi
Q
inductance
Ω
ESR <1
ceramic
DC/DC
Vout
electrolytic
capacitor
capacitor
Converter
Vsource
Fig. 13: Output voltage ripple (100 mV/div.) at full rated load
current into a resistive load with Co = 10 µF tantalum + 1uF ce-
ramic and Vin = 24 V. Time scale: 1 µs/div.
Fig. 14: Test Set-up for measuring input reflected ripple cur-
rents, ic and is.
Fig. 15: Input reflected ripple current, ic (100 mA/div.), meas-
ured at input terminals at full rated load current and Vin = 24 V.
Refer to Fig. 14 for test setup. Time scale: 1 µs/div.
Fig. 16: Input reflected ripple current, is (10 mA/div.), measured
through 10 µH at the source at full rated load current and Vin =
24 V. Refer to Fig. 14 for test setup. Time scale: 1µs/div.
SQ24x03150 FDS Ver 4 01-21-04
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Page 12 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
20
15
10
5
0
4
0
1
2
3
Iout [Adc]
Fig. 17: Output voltage vs. load current showing current limit
point and converter shutdown point. Input voltage has almost
no effect on current limit characteristic.
Fig. 18: Load current (top trace, 5 A/div., 20 ms/div.) into a 10
mΩ short circuit during restart, at Vin = 24 V. Bottom trace (5
A/div., 1 ms/div.) is an expansion of the on-time portion of the
top trace.
SQ24x03150 FDS Ver 4 01-21-04
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Page 13 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Physical Information
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:
Min. 0.080” X 0.112” [2.03 x 2.84]
1
2
3
8
7
6
5
4
TOP VIEW
SIDE VIEW
Pad/Pin Connections
Pad/Pin #
Function
Vin (+)
1
2
3
4
5
6
7
8
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
SQ24S Pinout (Surface Mount)
HT
CL
(Max. Height)
(Min. Clearance)
Height
Option
+0.000 [+0.00]
-0.038 [- 0.97]
0.319 [8.10]
0.352 [8.94]
0.516 [13.11]
0.416 [10.57]
0.298 [7.57]
+0.016 [+0.41]
-0.000 [- 0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
0.009 [0.23]
A
B
C
D
E
1
2
3
8
7
6
5
4
TOP VIEW
SIDE VIEW
PL
Pin Length
Pin
Option
±0.005 [±0.13]
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
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
Pins 4 and 8 are Ø 0.062” [1.57]
without shoulder
•
SQ24T Pinout (Through-hole)
•
•
•
Pin material: Brass
Pin Finish: Tin/Lead over Nickel
Converter Weight: 0.53 oz [15 g]
SQ24x03150 FDS Ver 4 01-21-04
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Page 14 of 15
SQ24T/S03150 19-36 Vdc Input, 3.3 A, 15 Vdc Output
Data Sheet
Converter Part Numbering Scheme
Product
Series
Input
Voltage
Mounting
Scheme
Rated Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT]
Pin
Length [PL]
Special
Features
SQ
24
T
03
150
-
N
B
A
0
SMT
S ⇒ 0.289”
SMT
0 ⇒ 0.00”
S ⇒
Surface
Mount
N ⇒
0 ⇒ STD
Negative
Through hole
A ⇒ 0.319”
B ⇒ 0.352”
C ⇒ 0.516”
D ⇒ 0.416”
E ⇒ 0.298”
One-Eighth
Brick
Through hole
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
S ⇒ SMC
Tin/Lead
over Nickel
19-36 V
3.3 A
150 ⇒ 15 V
Format
T⇒
Through-
hole
P ⇒
Positive
The example above describes P/N SQ24T03150-NBA0: 19-36 V input, through-hole mounting, 3.3 A @ 15 V output, negative ON/OFF logic, a
maximum height of 0.352”, and a through the board pin length of 0.188”. Please consult factory regarding availability of a specific version.
Fig. H: Location of the thermocouple for thermal testing.
For more information please contact
di/dt, a Power-One company
1822 Aston Avenue •• Carlsbad, CA •• 92008 •• USA
USA Toll Free 866-WOW-didt (969-3438)
www.didt.com •• support@didt.com
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as critical components in life support systems, equipment used in hazardous
environments, or nuclear control systems without the express written consent of the respective divisional president of Power-One, Inc.
The information and specifications contained in this data sheet are believed to be accurate and reliable at the time of publication. However, Power-One, Inc. assumes no responsibility for its use
or for any infringements of patents or other rights of third parties, which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Power-One,
Inc. Specifications are subject to change without notice. ©Copyright Power-One, Inc. 2004
SQ24x03150 FDS Ver 4 01-21-04
USA Toll Free 866 WOW-didt
Page 15 of 15
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