SQE48T30012-NDA0 [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, PACKAGE-8;
| 型号： | SQE48T30012-NDA0 |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, PACKAGE-8 电源电路 |
| 文件： | 总29页 (文件大小：532K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Features
• RoHS lead-free solder and lead-solder-exempted
products are available
• Delivers up to 30 A
• Industry-standard quarter-brick pinout
• Outputs available: 3.3, 2.5, 1.8, 1.5, and 1.2 VDC
• On-board input differential LC-filter
• Start-up into pre-biased load
• No minimum load required
• Weight: 0.72 oz [20.6 g]
• Meets Basic Insulation requirements of EN60950
• Withstands 100 V input transient for 100 ms
• Fixed-frequency operation
Applications
• Fully protected
• Telecommunications
• Data communications
• Wireless communications
• Servers, workstations
• Remote output sense
• Positive or negative logic ON/OFF option
• Latching and non-latching protection available
• Output voltage trim range: +10%/−20% with
industry-standard trim equations (except 1.2 Vout)
• High reliability: MTBF = 15.75 million hours,
calculated per Telcordia TR-332, Method I Case 1
Benefits
• UL60950 recognized in US and Canada and certified
per IEC/EN60950
• High efficiency – no heat sink required
• Higher current capability at elevated temperatures
• Designed to meet Class B conducted emissions per
than competitors’ 30 A quarter-bricks
FCC and EN55022 when used with external filter
• Industry standard 1/8th brick footprint: 0.896” x
2.30” (2.06 in2), 38% smaller than conventional
quarter-bricks
• All materials meet UL94, V-0 flammability rating
Description
The high temperature 30A SQE48 Series of DC-DC converters provides a high efficiency single output, in a 1/8th
brick package that is only 62% the size of the industry-standard quarter-brick. Specifically designed for operation
in systems that have limited airflow and increased ambient temperatures, the SQE48T30 converters utilize the
same pinout and functionality of the industry-standard quarter-bricks.
The 30 A SQE48 Series converters provide thermal performance in high temperature environments that exceeds
most competitors' 30A quarter-bricks. This performance is accomplished through the use of patented/patent-
pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal
management, and a low-body profile.
Low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling
for both upstream and downstream devices. The use of 100% automation for assembly, coupled with advanced
electronic circuits and thermal design, results in a product with extremely high reliability.
Operating from a 36-75 V input, the SQE48T30 converters provide any standard output voltage from 3.3 V down
to 1.2 V that can be trimmed from –20% to +10% of the nominal output voltage (±10% for output voltage 1.2 V),
thus providing outstanding design flexibility.
With standard pinout and trim equations, the SQE48 Series converters are perfect drop-in replacements for
existing 30 A quarter-brick designs. Inclusion of this converter in a new design can result in significant board space
and cost savings. The designer can expect reliability improvement over other available converters because of the
SQE48 Series’ optimized thermal efficiency.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 1 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Notes
Min
Typ
Max Units
Absolute Maximum Ratings
Input Voltage
Continuous
0
80
85
VDC
°C
Operating Ambient Temperature
Storage Temperature
Isolation Characteristics
I/O Isolation
-40
-55
125
°C
2250
10
VDC
pF
Isolation Capacitance
Isolation Resistance
200
440
MΩ
Feature Characteristics
Switching Frequency
Output Voltage Trim Range1
kHz
%
Industry-std. equations (3.3 - 1.5 V)
Use trim equation on Page 6 (1.2 V)
Percent of VOUT(NOM)
-20
-10
+10
+10
+10
%
%
Remote Sense Compensation1
Output Overvoltage Protection
Latching or Non-latching (3.3 - 1.8 V)
Latching or Non-latching (1.5 - 1.2 V)
Non-latching
117
122
122
128
125
130
140
%
%
Overtemperature Shutdown (PCB)
Peak Back-drive Output Current
(Sinking current from external source)
during startup into pre-biased output
Back-drive Output Current (Sinking Current
from external source)
°C
Peak amplitude
1
ADC
µs
Peak duration
Converter Off;
external voltage 5 VDC
50
10
200
3
30
mADC
ms
Auto-Restart Period
Applies to all protection features
See Figs. E, F, and G
Turn-On Time
ms
ON/OFF Control (Positive Logic)
Converter Off (logic low)
Converter On (logic high)
ON/OFF Control (Negative Logic)
Converter Off (logic high)
Converter On (logic low)
-20
2.4
0.8
20
VDC
VDC
2.4
-20
20
VDC
VDC
0.8
Additional Notes:
1
Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources
should not exceed 10% of VOUT(NOM), in order to ensure specified operation of overvoltage protection circuitry.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 2 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications (continued)
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Input Characteristics
Notes
Min
Typ
Max Units
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
36
48
75
VDC
33
31
34
32
35
33
VDC
VDC
VDC
Turn-off Threshold
Input Voltage Transient
Maximum Input Current
100 ms
100
30 ADC Out @ 36 VDC In
VOUT = 3.3 VDC
3.1
2.4
1.7
1.5
1.2
ADC
ADC
ADC
ADC
ADC
mA
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
Input Stand-by Current
Vin = 48V, converter disabled
Vin = 48V, converter enabled
VOUT = 3.3 VDC
2
Input No Load Current (0 load on the output)
42
34
30
28
27
mA
mA
mA
mA
mA
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
Input Reflected-Ripple Current, is
Vin = 48V, 25 MHz bandwidth
VOUT = 3.3 VDC
8
6
6
6
6
mAPK-PK
mAPK-PK
mAPK-PK
mAPK-PK
mAPK-PK
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
Input Voltage Ripple Rejection
120 Hz
VOUT = 3.3 VDC
91
60
70
65
65
dB
dB
dB
dB
dB
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 3 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Electrical Specifications (continued)
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, Cin=33 µF, unless otherwise specified.
Parameter
Notes
Min
Typ
Max Units
Output Characteristics
External Load Capacitance
Output Current Range
Plus full load (resistive)
30,000
30
µF
ADC
ADC
A
0
Current Limit Inception
Non-latching
31.5
36.5
6
42
Peak Short-Circuit Current
RMS Short-Circuit Current
Output Voltage Set Point (no load)2
Output Regulation Over Line
Over Line
Non-latching, Short = 10 mΩ
Non-latching
46
8
Arms
%Vout
-1
+1
±2
±2
±5
±5
mV
mV
Over Load
Output Voltage Range
Over line, load and temperature2
Full load + 10 µF tantalum + 1 µF ceramic
VOUT = 3.3 VDC
-1.5
+1.5 %Vout
Output Ripple and Noise – 25 MHz bandwidth
40
35
30
25
20
75
60
50
45
40
mVPK-PK
mVPK-PK
mVPK-PK
mVPK-PK
mVPK-PK
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
Dynamic Response
Load Change 10A-20A-10A
di/dt = 0.1 A/μs
Co = 1 µF ceramic (Fig. 3.3V.9)
Co = 470 µF POS + 1 µF ceramic
303
150
15
mV
mV
µs
di/dt = 5 A/μs
Settling Time to 1% of Vout
Efficiency
%
%
%
%
%
%
%
%
%
%
100% Load
VOUT = 3.3 VDC
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
VOUT = 3.3 VDC
VOUT = 2.5 VDC
VOUT = 1.8 VDC
VOUT = 1.5 VDC
VOUT = 1.2 VDC
90.5
89.0
86.5
85.0
83.0
92.0
90.5
88.5
87.0
85.0
50% Load
Additional Notes:
2
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
See waveforms for dynamic response and settling time for different output voltages.
3
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 4 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
source (±20 V maximum) may be connected directly
to the ON/OFF input, in which case it must be
capable of sourcing or sinking up to 1 mA depending
on the signal polarity. See the Startup Information
section for system timing waveforms associated with
use of the ON/OFF pin.
Operations
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.
Remote Sense (Pins 5 and 7)
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 33 µF electrolytic capacitor with an
ESR < 1 Ω across the input helps to 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 30,000 µF on
3.3 to 1.2 V outputs.
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).
Rw
SQE48 Converter
Vout (+)
100
Vin (+)
ON/OFF
Vin (-)
(Top View)
SENSE (+)
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
Rload
TRIM
Vin
SENSE (-)
10
Vout (-)
Rw
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 and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
Fig. B: Remote sense circuit configuration.
CAUTION
If remote sensing is not utilized, 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 data
sheet value.
SQE48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
Rload
Vin
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
system noise and ensure optimum performance.
SENSE (-)
Vout (-)
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
The converter’s output overvoltage 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 positive logic version turns on when the ON/OFF
pin is at a logic high and turns off when at a logic
low. The converter is on when the ON/OFF pin is left
open. See the Electrical Specifications for logic
high/low definitions.
The negative logic version turns on when the pin is
at a logic low and turns off when the pin is at a 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 capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
The ON/OFF pin is internally pulled up to 5 V
through
a
resistor.
A
properly de-bounced
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
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 voltage of ≤ 0.8 V. An external voltage
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 5 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
current (originally obtained from the derating curves)
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:
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
511
R
T−DECR
=
=
− 10.22
− 15
[kΩ]
[kΩ]
(3.3 – 1.5 V)
(1.2 V)
Output Voltage Adjust /TRIM (Pin 6)
| Δ |
The output voltage can be adjusted up 10% or down
20% for Vout ≥ 1.5 V, and ±10% for Vout = 1.2 V
relative to the rated output voltage by the addition of
an externally connected resistor. For output voltage
3.3 V, trim up to 10% is guaranteed only at Vin≥
40 V, and it is marginal (8% to 10%) at Vin = 36 V.
700
RT−DECR
| Δ |
where,
R
T−DECR
=
Required value of trim-down resistor [kΩ]
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.
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 (except for 1.2 V output).
To increase the output voltage, refer to Fig. C. A trim
resistor, RT-INCR, should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
Converters with output voltages 1.2 V is available with alternative
trim feature to provide the customers with the flexibility of second
sourcing has a character “T” in the part number. The trim
equations of “T” version of converters and more information can
be found in Application Note for Output Voltage Trim Function
Operation.
5.11(100 + Δ)VO−NOM − 626
[kΩ],
RT−INCR
=
− 10.22
1.225Δ
for 3.3 – 1.5 V.
84.6
R
T−INCR
=
− 7.2
[kΩ]
(1.2 V)
SQE48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Δ
(Top View)
where,
Rload
Vin
RT-DECR
SENSE (-)
Vout (-)
R
T−INCR
=
=
Required value of trim-up resistor kΩ]
V
O−NOM
Nominal value of output voltage [V]
Fig. D: Configuration for decreasing output voltage.
(VO-REQ − VO-NOM
)
Δ =
X 100
[%]
VO -NOM
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 overvoltage 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 VOUT(NOM), or:
V
O−REQ
=
Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See the previous section for a complete discussion
of this requirement.
[V]
[VOUT(+) − VOUT(−)] − [VSENSE(+) − VSENSE(−)] ≤ VO - NOM X10%
SQE48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
This equation is applicable for any condition of output
sensing and/or output trim.
RT-INCR
Rload
Vin
SENSE (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 6 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Overtemperature Protection (OTP)
Protection Features
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. The converter with the
non-latching option will automatically restart after it
has cooled to a safe operating temperature.
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 typically 34 V for the
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops typically below 32 V. This feature is beneficial
in preventing deep discharging of batteries used in
telecom applications.
Safety Requirements
The converters meet North American and
International safety regulatory requirements per
UL60950 and EN60950. Basic Insulation is provided
between input and output.
Output Overcurrent Protection (OCP)
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.
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 60%
of the nominal value of output voltage, the converter
will shut down (Fig x.15).
Output Voltage
3.3 V
Fuse Rating
5 A
4 A
Once the converter has shut down, it will attempt to
restart nominally every 200 ms with a typical 3-5%
duty cycle (Fig. x.16). The attempted restart will
continue indefinitely until the overload or short circuit
conditions are removed or the output voltage rises
above 40-50% of its nominal value.
2.5 V
1.8 V, 1.5 V
1.2 V
3 A
2.5 A
All SQE converters are UL approved for maximum
fuse rating of 15A. To protect a group of converters
with a single fuse, the rating can be increased from
the recommended value above.
Once the output current is brought back into its
specified range, the converter automatically exits the
hiccup mode and continues normal operation.
For implementations where latching is required, a
“Latching” option (L) is available for short circuit and
OVP protections. Converters with the latching
feature will latch off if either event occurs. The
converter will attempt to restart after either the input
voltage is removed and reapplied OR the ON/OFF
pin is cycled
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, Power-One tests its
converters to several system level standards,
primary of which is the more stringent EN55022,
Information
technology
equipment
-
Radio
Output Overvoltage Protection (OVP)
disturbance characteristics-Limits and methods of
measurement.
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 200 ms until the
OVP condition is removed.
An effective internal LC differential filter significantly
reduces input reflected ripple current, and improves
EMC. With the addition of a simple external filter, all
versions of the SQE48-Series of converters pass the
requirements of Class B conducted emissions per
EN55022 and FCC requirements. Contact Power-
One Applications Engineering for details of this
testing.
For implementations where latching is required, a
“Latching” option (L) is available for short circuit and
OVP protections. Converters with the latching
feature will latch off if either event occurs. The
converter will attempt to restart after either the input
voltage is removed and reapplied OR the ON/OFF
pin is cycled.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 7 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
VIN
Startup Information (using negative ON/OFF)
Scenario #1: Initial Startup From Bulk Supply
ON/OFF function enabled, converter started via application
of VIN. See Figure E.
ON/OFF
STATE
OFF
ON
Time
t0
Comments
ON/OFF pin is ON; system front-end power is
toggled on, VIN to converter begins to rise.
VIN crosses undervoltage Lockout protection
circuit threshold; converter enabled.
Converter begins to respond to turn-on
command (converter turn-on delay).
t1
t2
t3
VOUT
Converter VOUT reaches 100% of nominal value.
For this example, the total converter startup time (t3- t1) is
typically 3 ms.
t
t
0
t
1
t
2
t3
Fig. E: Startup scenario #1.
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via
ON/OFF pin. See Figure F.
VIN
Time
t0
t1
Comments
VINPUT at nominal value.
Arbitrary time when ON/OFF pin is enabled
(converter enabled).
ON/OFF
STATE
t2
t3
End of converter turn-on delay.
Converter VOUT reaches 100% of nominal value.
OFF
ON
For this example, the total converter startup time (t3- t1) is
typically 3 ms.
V
OUT
Scenario #3: Turn-off and Restart Using ON/OFF Pin
With VIN previously powered, converter is disabled and
then enabled via ON/OFF pin. See Figure G.
t
Time
Comments
t
0
t
1
t
2
t3
t0
VIN and VOUT are at nominal values; ON/OFF pin
ON.
Fig. F: Startup scenario #2.
t1
ON/OFF pin arbitrarily disabled; converter
output falls to zero; turn-on inhibit delay period
(200 ms typical) is initiated, and ON/OFF pin
action is internally inhibited.
IN
V
t2
ON/OFF pin is externally re-enabled.
If (t2- t1) ≤ 200 ms, external action of
ON/OFF pin is locked out by startup inhibit
timer.
200 ms
ON/OFF
STATE
OFF
ON
If (t2- t1) > 200 ms, ON/OFF pin action is
internally enabled.
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.
End of converter turn-on delay.
OUT
V
t4
t5
Converter VOUT reaches 100% of nominal value.
For the condition, (t2- t1) ≤ 200 ms, the total converter
startup time (t5- t2) is typically 203 ms. For (t2- t1) > 200 ms,
startup will be typically 3 ms after release of ON/OFF pin.
t
0
1
2
3
4
5
t
t
t
t
t
t
Fig. G: Startup scenario #3.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 8 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
temperature of 120 °C as indicated by the
thermographic image, or
(ii) The temperature of the transformer does not
Characterization
General Information
exceed 120 °C, or
(iii) The nominal rating of the converter (30 A on
3.3 to 1.2 V).
During normal operation, derating curves with
maximum FET temperature less or equal to 120 °C
should not be exceeded. Temperature at both
thermocouple locations shown in Fig. H should not
exceed 120 °C in order to operate inside the derating
curves.
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, startup and shutdown
parameters, output ripple and noise, transient
response to load step-change, overload, and short
circuit.
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, comprised of 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.
Fig. H: Locations of the thermocouple for thermal testing.
Efficiency
Fig. x.3 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
36 V, 48 V, and 72 V. Also, a plot of efficiency vs. load
current, as a function of ambient temperature with
Vin = 48 V, airflow rate of 200 LFM (1 m/s) with
vertical mounting is shown in Fig. x.4.
All measurements requiring airflow were made in the
vertical and horizontal wind tunnel 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
Power Dissipation
Fig. x.5 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 36 V, 48
V, and 72 V. Also, a plot of power dissipation vs. load
current, as a function of ambient temperature with
Vin = 48 V, airflow rate of 200 LFM (1 m/s) with
vertical mounting is shown in Fig. x.6.
operating
temperatures
in
the
application.
Thermographic imaging is preferable; if this
capability is not available, then thermocouples may
be used. The use of AWG #40 gauge thermocouples
is recommended to ensure measurement accuracy.
Careful routing of the thermocouple leads will further
minimize measurement error. Refer to Fig. H for the
optimum measuring thermocouple locations.
Startup
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 Figs. x.7-8, respectively.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Fig. x.1 and Fig. x.2 for vertical
and horizontal converter mounting. 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).
Ripple and Noise
Fig. x.11 show 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 µF ceramic capacitor.
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 does not exceed a maximum specified
The input reflected-ripple current waveforms are
obtained using the test setup shown in Fig x.12. The
corresponding waveforms are shown in Figs. x.13-14.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 9 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
SQE48T30033 Characterization Curves
35
30
25
20
35
30
25
20
500 LFM (2.5 m/s)
15
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 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. 3.3V.2: Available load current vs. ambient air temperature
and airflow rates for SQE48T30033 converter mounted
horizontally with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120 °C, Vin = 48 V.
Fig. 3.3V.1: Available load current vs. ambient air temperature
and airflow rates for SQE48T30033 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120
°C, Vin = 48 V.
Note: NC – Natural convection
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
70 C
55 C
40 C
72 V
48 V
36 V
0.75
0.75
0.70
0.70
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.4: Efficiency vs. load current and ambient temperature
for SQE48T30033 converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 3.3V.3: Efficiency vs. load current and input voltage for
SQE48T30033 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 10 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
15.00
12.00
9.00
6.00
3.00
0.00
15.00
12.00
9.00
6.00
72 V
48 V
36 V
70 C
55 C
40 C
3.00
0.00
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 3.3V.5: Power dissipation vs. load current and input voltage
for SQE48T30033 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. 3.3V.6: Power dissipation vs. load current and ambient
temperature for SQE48T30033 converter mounted vertically
with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
Fig. 3.3V.8: Turn-on transient at full rated load current
(resistive) plus 10,000 µF at Vin = 48 V, 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. 3.3V.7:
Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, 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. 3.3V.9: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/µs. Co = 1 µF ceramic.
Time scale: 0.2 ms/div.
Fig. 3.3V.10: Output voltage response to load current step-change
(10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output voltage (100
mV/div.). Bottom trace: load current (10 A/div.). Current slew rate: 5
A/µs. Co = 470 µF POS + 1 µF ceramic. Time scale: 0.2 ms/div.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 11 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
iS
iC
10 µH
source
inductance
SQE48
33 µF
ESR < 1
electrolytic
capacitor
1 µF
ceramic
capacitor
Ω
DC-DC
Converter
Vout
Vsource
Fig. 3.3V.12: Test setup for measuring input reflected ripple
currents, ic and is.
Fig. 3.3V.11: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum + 1
µF ceramic and Vin = 48 V. Time scale: 1 µs/div..
Fig. 3.3V.13: Input reflected-ripple current, ic (50 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 3.3V.12 for test setup. Time scale: 1 µs/div.
Fig. 3.3V.14: Input reflected-ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 3.3V.12 for test setup. Time scale:
1 µs/div.
4.0
3.0
2.0
1.0
0
0
10
20
30
40
Iout [Adc]
Fig. 3.3V.15: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
Fig. 3.3V.16: Load current (top trace, 20 A/div.,
50 ms/div.) into a 10 mΩ short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 1 ms/div.) is an expansion
of the on-time portion of the top trace.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 12 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
SQE48T30025 Characterization Curves
35
30
25
20
35
30
25
20
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
5
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
0
20
30
40
50
60
70
80
90
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Ambient Temperature [°C]
Fig. 2.5V.2: Available load current vs. ambient air temperature
and airflow rates for SQE48T30025 converter mounted
horizontally with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120 °C, Vin = 48 V.
Fig. 2.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQE48T30025 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120
°C, Vin = 48 V.
Note: NC – Natural convection
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
70 C
55 C
40 C
72 V
48 V
0.75
36 V
0.75
0.70
0
5
10
15
20
25
30
35
0.70
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 2.5V.4: Efficiency vs. load current and ambient temperature
for SQE48T30025 converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 2.5V.3: Efficiency vs. load current and input voltage for
SQE48T30025 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 13 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
12.00
10.00
8.00
6.00
4.00
2.00
0.00
12.00
10.00
8.00
6.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
2.00
0.00
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 2.5V.5: Power dissipation vs. load current and input voltage
for SQE48T30025 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.6: Power dissipation vs. load current and ambient
temperature for SQE48T30025 converter mounted vertically
with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
Fig. 2.5V.8: Turn-on transient at full rated load current
(resistive) plus 10,000 µF at Vin = 48 V, 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. 2.5V.7:
Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 14 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 2.5V.9: Output voltage response to load current step-
Fig. 2.5V.10: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 5A/µs.Co = 470 µF POS + 1 µF ceramic.
Time scale: 0.2 ms/div.
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/µs. Co = 1 µF ceramic.
Time scale: 0.2 ms/div.
iS
iC
10 µH
source
inductance
SQE48
33 µF
ESR < 1
electrolytic
capacitor
1 µF
ceramic
capacitor
Ω
DC-DC
Converter
Vout
Vsource
Fig. 2.5V.12: Test setup for measuring input reflected ripple
currents, ic and is.
Fig. 2.5V.11: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum + 1
µF ceramic and Vin = 48 V. Time scale: 1 µs/div.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 15 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 2.5V.13: Input reflected-ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 2.5V.12 for test setup. Time scale: 1 µs/div.
Fig. 2.5V.14: Input reflected-ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 2.5V.12 for test setup. Time scale:
1 µs/div.
4.0
3.0
2.0
1.0
0
0
10
20
30
40
Iout [Adc]
Fig. 2.5V.16: Load current (top trace, 20 A/div.,
50 ms/div.) into a 10 mΩ short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion
of the on-time portion of the top trace.
Fig. 2.5V.15: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 16 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
SQE48T30018 Characterization Curves
35
30
25
20
35
30
25
20
500 LFM (2.5 m/s)
15
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 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. 1.8V.2: Available load current vs. ambient air temperature
and airflow rates for SQE48T30018 converter mounted
horizontally with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120 °C, Vin = 48 V.
Fig. 1.8V.1: Available load current vs. ambient air temperature
and airflow rates for SQE48T30018 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120
°C, Vin = 48 V.
Note: NC – Natural convection
0.95
0.90
0.85
0.80
0.95
0.90
0.85
0.80
70 C
55 C
40 C
0.75
72 V
48 V
36 V
0.75
0.70
0.65
0.70
0.65
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.4: Efficiency vs. load current and ambient temperature
for SQE48T30018 converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.8V.3: Efficiency vs. load current and input voltage for
SQE48T30018 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 17 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
12.00
10.00
8.00
6.00
4.00
2.00
0.00
12.00
10.00
8.00
6.00
72 V
48 V
36 V
70 C
55 C
40 C
4.00
2.00
0.00
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.8V.5: Power dissipation vs. load current and input voltage
for SQE48T30018 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.6: Power dissipation vs. load current and ambient
temperature for SQE48T30018 converter mounted vertically with
Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM
(1.0 m/s).
Fig. 1.8V.8: Turn-on transient at full rated load current
(resistive) plus 10,000 µF at Vin = 48 V, 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. 1.8V.7:
Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 18 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.8V.9: Output voltage response to load current step-
Fig. 1.8V.10: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 5 A/µs. Co = 470 µF POS + 1 µF ceramic.
Time scale: 0.2 ms/div.
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/µs. Co = 1 µF ceramic.
Time scale: 0.2 ms/div.
iS
iC
10 µH
source
inductance
SQE48
33 µF
ESR < 1
electrolytic
capacitor
1 µF
ceramic
capacitor
Ω
DC-DC
Converter
Vout
Vsource
Fig. 1.8V.11: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum + 1
µF ceramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 1.8V.12: Test setup for measuring input reflected ripple
currents, ic and is.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 19 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.8V.13: Input reflected-ripple current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.8V.12 for test setup. Time scale: 1 µs/div.
Fig. 1.8V.14: Input reflected-ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 1.8V.12 for test setup. Time scale:
1 µs/div.
2.4
1.8
1.2
0.6
0
0
10
20
30
40
Iout [Adc]
Fig. 1.8V.16: Load current (top trace, 20 A/div.,
50 ms/div.) into a 10 mΩ short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion
of the on-time portion of the top trace.
Fig. 1.8V.15: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 20 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
SQE48T30015 Characterization Curves
35
30
25
20
35
30
25
20
500 LFM (2.5 m/s)
15
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 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. 1.5V.2: Available load current vs. ambient air temperature
and airflow rates for SQE48T30015 converter mounted
horizontally with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120 °C, Vin = 48 V.
Fig. 1.5V.1: Available load current vs. ambient air temperature
and airflow rates for SQE48T30015 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120
°C, Vin = 48 V.
Note: NC – Natural convection
0.90
0.85
0.80
0.75
0.90
0.85
0.80
0.75
70 C
55 C
40 C
72 V
48 V
36 V
0.70
0.70
0.65
0.60
0.65
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.5V.4: Efficiency vs. load current and ambient temperature
for SQE48T30015 converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.5V.3: Efficiency vs. load current and input voltage for
SQE48T30015 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 21 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
10.00
8.00
6.00
4.00
2.00
0.00
10.00
8.00
6.00
4.00
72 V
48 V
36 V
70 C
55 C
40 C
2.00
0.00
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.5V.5: Power dissipation vs. load current and input voltage
for SQE48T30015 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.6: Power dissipation vs. load current and ambient
temperature for SQE48T30015 converter mounted vertically with
Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of 200 LFM
(1.0 m/s).
Fig. 1.5V.8: Turn-on transient at full rated load current
(resistive) plus 10,000 µF at Vin = 48 V, 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. 1.5V.7:
Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 22 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.5V.9: Output voltage response to load current step-
Fig. 1.5V.10: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 5A/µs. Co = 470 µF POS + 1 µF ceramic.
Time scale: 0.2 ms/div.
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/µs. Co = 1 µF ceramic.
Time scale: 0.2 ms/div.
iS
iC
10 µH
source
inductance
SQE48
33 µF
ESR < 1
electrolytic
capacitor
1 µF
ceramic
capacitor
Ω
DC-DC
Converter
Vout
Vsource
Fig. 1.5V.11: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum + 1
µF ceramic and Vin = 48 V. Time scale: 1 µs/div.
Fig. 1.5V.12: Test setup for measuring input reflected ripple
currents, ic and is.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 23 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.5V.13: Input reflected ripple-current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.5V.12 for test setup. Time scale: 1 µs/div.
Fig. 1.5V.14: Input reflected-ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 1.5V.12 for test setup. Time scale:
1 µs/div.
2.0
1.5
1.0
0.5
0
0
10
20
30
40
Iout [Adc]
Fig. 1.5V.16: Load current (top trace, 20 A/div.,
50 ms/div.) into a 10 mΩ short circuit during restart, at
Vin = 48 V. Bottom trace (20 A/div., 2 ms/div.) is an expansion
of the on-time portion of the top trace.
Fig. 1.5V.15: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 24 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
SQE48T30012 Characterization Curves
35
30
25
20
35
30
25
20
500 LFM (2.5 m/s)
15
500 LFM (2.5 m/s)
15
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
400 LFM (2.0 m/s)
300 LFM (1.5 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 30 LFM (0.15 m/s)
10
5
200 LFM (1.0 m/s)
100 LFM (0.5 m/s)
NC - 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. 1.2V.2: Available load current vs. ambient air temperature
and airflow rates for SQE48T30012 converter mounted
horizontally with air flowing from pin 3 to pin 1, MOSFET
temperature ≤ 120 °C, Vin = 48 V.
Fig. 1.2V.1: Available load current vs. ambient air temperature
and airflow rates for SQE48T30012 converter mounted vertically
with air flowing from pin 3 to pin 1, MOSFET temperature ≤ 120
°C, Vin = 48 V.
Note: NC – Natural convection
0.90
0.85
0.80
0.75
0.90
0.85
0.80
0.75
0.70
0.70
70 C
55 C
40 C
72 V
48 V
36 V
0.65
0.60
0.55
0.65
0.60
0.55
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.4: Efficiency vs. load current and ambient temperature
for SQE48T30012 converter mounted vertically with Vin = 48 V
and air flowing from pin 3 to pin 1 at a rate of 200 LFM (1.0 m/s).
Fig. 1.2V.3: Efficiency vs. load current and input voltage for
SQE48T30012 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 25 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
10.00
8.00
6.00
4.00
2.00
0.00
10.00
8.00
6.00
4.00
72 V
48 V
36 V
70 C
55 C
40 C
2.00
0.00
0
5
10
15
20
25
30
35
0
5
10
15
20
25
30
35
Load Current [Adc]
Load Current [Adc]
Fig. 1.2V.5: Power dissipation vs. load current and input voltage
for SQE48T30012 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.6: Power dissipation vs. load current and ambient
temperature for SQE48T30012 converter mounted vertically
with Vin = 48 V and air flowing from pin 3 to pin 1 at a rate of
200 LFM (1.0 m/s).
Fig. 1.2V.8: Turn-on transient at full rated load current
(resistive) plus 10,000 µF at Vin = 48 V, 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. 1.2V.7:
Turn-on transient at full rated load current
(resistive) with no output capacitor at Vin = 48 V, 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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 26 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.2V.9: Output voltage response to load current step-
Fig. 1.2V.10: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current (10 A/div.).
Current slew rate: 5 A/µs. Co = 470 µF POS + 1 µF ceramic.
Time scale: 0.2 ms/div.
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (100 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/µs. Co = 1 µF ceramic.
Time scale: 0.2 ms/div.
iS
iC
10 µH
source
inductance
SQE48
33 µF
ESR < 1
electrolytic
capacitor
1 µF
ceramic
capacitor
Ω
DC-DC
Converter
Vout
Vsource
Fig. 1.2V.12: Test setup for measuring input reflected ripple
currents, ic and is.
Fig. 1.2V.11: Output voltage ripple (20 mV/div.) at full rated
load current into a resistive load with Co = 10 µF tantalum + 1
µF ceramic and Vin = 48 V. Time scale: 1 µs/div.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 27 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Fig. 1.2V.13: Input reflected ripple-current, ic (100 mA/div.),
measured at input terminals at full rated load current and Vin =
48 V. Refer to Fig. 1.2V.12 for test setup. Time scale: 1 µs/div.
Fig. 1.2V.14: Input reflected-ripple current, is (10 mA/div.),
measured through 10 µH at the source at full rated load current
and Vin = 48 V. Refer to Fig. 1.2V.12 for test setup. Time scale:
1 µs/div.
1.6
1.2
0.8
0.4
0
0
10
20
30
40
Iout [Adc]
Fig. 1.2V.16: Load current (top trace, 20 A/div., 50 ms/div.) into
a 10 mΩ short circuit during restart, at Vin = 48 V. Bottom trace
(20 A/div., 5 ms/div.) is an expansion of the on-time portion of
the top trace.
Fig. 1.2V.15: Output voltage vs. load current showing current
limit point and converter shutdown point. Input voltage has
almost no effect on current limit characteristic.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 28 of 29
SQE48T30 DC-DC Series Data Sheet
36-75 VDC Input; 1.2-3.3 VDC @ 30 A Output
Physical Information (For standard and latching option)
SQE48T Pinout (Through-hole)
Pad/Pin Connections
Pad/Pin #
Function
1
2
3
8
7
6
5
4
1
2
3
4
5
6
7
8
Vin (+)
TOP VIEW
SIDE VIEW
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
SQE48T 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
Pin Material & Finish: Brass Alloy 360
with Matte Tin over Nickel
Converter Weight: 0.72 oz [20.6 g]
HT
CL
PL
Height
(Max. Height) (Min. Clearance)
Option +0.000 [+0.00]
Pin Length
±0.005
[±0.13]
Pin
Option
+0.016 [+0.41]
-0.000 [- 0.00]
•
•
•
-0.038 [- 0.97]
D
G
0.374 [9.5]
0.035 [0.89]
0.035 [0.89]
A
B
C
0.188 [4.78]
0.145 [3.68]
0.110 [2.794]
0.407 [10.34]
Converter Part Numbering/Ordering Information
Rated
Product Input
Series1 Voltage
Mounting
Scheme
Output
ON/OFF Maximum
Pin
Special
Features
Load
RoHS
Voltage
Logic
Height [HT] Length [PL]
Current
SQE
48
T
30
033
-
N
G
B
0
0 ⇒ STD
No Suffix ⇒
RoHS
lead-solder-
exemption
compliant
N ⇒
L ⇒
Latching
Option
012 ⇒ 1.2 V
015 ⇒ 1.5 V
018 ⇒ 1.8 V
025 ⇒ 2.5 V
033 ⇒ 3.3 V
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
One-
Eighth
Brick
Negative
D2⇒ 0.374”
G ⇒ 0.407”
T ⇒
Through-
hole
36-75 V
30 ADC
Format
G ⇒ RoHS
compliant for
all six
P ⇒
Positive
T ⇒
Alternative
Trim Option
(1.2 V only)
substances
The example above describes p/n SQE48T30033-NGB0: 36-75V input, through-hole, 30A @ 3.3 V output, negative ON/OFF logic, a 0.145”
pin length, maximum height of 0.407”, standard (non-latching) protection, and RoHS lead-solder-exemption compliance.
1
All possible option combinations are not necessarily available for every model. Contact Customer Service to confirm
availability.
2
Maximum Height option D is only available on model SQE48T30033-NDA0
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.
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.
ZD-01961 Rev. 2.1, 17-Mar-11
www.power-one.com
Page 29 of 29
相关型号：
SQE48T30012-NDALG
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8
BEL
SQE48T30012-NDB0G
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8
BEL
SQE48T30012-NDBLG
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8
BEL
SQE48T30012-NDBTG
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8
BEL
©2020 ICPDF网 联系我们和版权申明