SSQ48T20025-NBA0G [BEL]
DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8;
| 型号： | SSQ48T20025-NBA0G |
| 厂家： | 
BEL FUSE INC. |
| 描述： | DC-DC Regulated Power Supply Module, 1 Output, Hybrid, ROHS COMPLIANT PACKAGE-8 |
| 文件： | 总13页 (文件大小：446K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Features
• RoHS lead free for all six substances
• Delivers 18.9 A output current at 70 °C, 200 LFM
• Industry-standard DOSA footprint
• Weight: 0.422 oz (11.95 g)
• 0.40” (10.16 mm) height profile
• On-board input differential LC-filter
• Start-up into pre-biased load
• No minimum load required
• Meets Basic Insulation requirements of EN60950
• Withstands 100 V input transient for 100 ms
• Operating ambient temperature: -40 °C to 85 °C
• Fixed-frequency operation
Applications
• Hiccup overcurrent protection
• Fully protected (OTP, OCP, OVP, UVLO)
• Remote Sense
• Intermediate Bus Architectures
• Telecommunications
• Remote ON/OFF (Positive or negative logic)
• Data communications
• Output voltage trim range: +10%/−20% with
• Wireless communications
• Servers, workstations
industry-standard trim equations
• UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950 (pending)
Benefits
• Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
• High efficiency – no heat sink required
• Cost-effective, single board design
• Small size and low-profile
• All materials meet UL94, V-0 flammability rating
Description
The SSQ48T20025 power module is an open frame sixteenth-brick dc-dc converter that conforms to the
Distributed Open Standards Architecture (DOSA) specifications. The module operates over an input voltage range
of 36 to 75 VDC, and provides a regulated output voltage of 2.5 VDC with an output current up to 20 A for today’s
Distributed Power Architecture. The output is fully isolated from the input; the module meets Basic Insulation
requirements and permits a positive or negative output configuration.
The module is constructed using a single-board approach with both planar and discrete magnetics. The standard
feature set includes remote On/Off (positive or negative logic), input undervoltage lockout, output
overvoltage shutdown, output overcurrent shutdown, output voltage trim, and overtemperature shutdown with
hysteresis.
The SSQ48 Series of converters is available in both surface-mount (SSQ48S-) and through-hole (SSQ48T-)
versions.
MAY 16, 2006 revised to JUN 16, 2006
Page 1 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Electrical Specifications
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max
Units
Absolute Maximum Ratings
Input Voltage
Continuous
0
100
85
VDC
°C
Operating Ambient Temperature
Storage Temperature
Input Characteristics
Operating Input Voltage Range
Input Undervoltage Lockout
Turn-on Threshold
-40
-55
125
°C
36
48
75
VDC
Non-latching
100 ms
33
29
33.7
31.2
35
33
VDC
VDC
VDC
Turn-off Threshold
Input Voltage Transient
Isolation Characteristics
I/O Isolation
100
1500
VDC
Feature Characteristics
Switching Frequency
Output Voltage Trim Range1
Remote Sense Compensation1
375
kHz
%
Industry-std. equations
Percent of VOUT(NOM)
-20
+10
+10
%
Output Overvoltage Protection
Overtemperature Shutdown (PCB)
Auto-Restart Period
Latching (Auto Recovery optional)2
120
127
125
200
30
134
%
Non-latching
°C
ms
ms
Applies to all protection features
See Fig. F and Fig. G
Turn-On Time
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 up to 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.
2
Please consult factory for details.
MAY 16, 2006 revised to JUN 16, 2006
Page 2 of 13
www.power-one.com
SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Electrical Specifications (continued)
Conditions: TA = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Notes
Min
Typ
Max Units
Input Characteristics
Maximum Input Current
20 ADC, 2.5 VDC Out @ 36 VDC In
Vin = 48 VDC, converter disabled
Vin = 48 VDC, converter enabled
20 MHz bandwidth
2
ADC
mADC
mADC
mAPK-PK
dB
Input Stand-by Current
4
60
10
-
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
120 Hz
2.44
2.479 2.517
VDC
±2
±2
Over Line
±5
±5
mV
mV
Over Load
Output Voltage Range
Output Ripple and Noise – 25 MHz
bandwidth
Over line, load and temperature3
2.433 2.479 2.535
VDC
Full load + 10 μF tantalum + 1 μF ceramic
20
50
10,000
20
mVPK-PK
μF
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Dynamic Response
Plus full load (resistive)
0
ADC
ADC
A
Non-latching
22
26
28
3
30
Non-latching. Short = 10 mΩ.
Non-latching. Short = 10 mΩ.
Arms
Load Change 10A-20A-10A, di/dt = 0.1 A/μs Co = 1 μF ceramic
300
500
150
mV
mV
di/dt = 1 A/μs
Co = 270 μF OSCON + 1 μF ceramic
Settling Time to 1%
µs
Efficiency
100% Load
50% Load
88.6
87.5
%
%
Additional Notes:
3
-40 ºC to 85 ºC.
MAY 16, 2006 revised to JUN 16, 2006
Page 3 of 13
www.power-one.com
SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
to the ON/OFF input, in which case it must be
capable of sinking up to 2 mA.
Operations
Input and Output Impedance
Remote Sense (Pins 5 and 7)
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
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).
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 10,000 µF on 2.5 V
output.
Rw
SSQ48 Converter
Vout (+)
100
Vin (+)
ON/OFF
Vin (-)
(Top View)
SENSE (+)
Rload
TRIM
Vin
SENSE (-)
10
Vout (-)
Rw
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
Fig. B: Remote sense circuit configuration.
ON/OFF (Pin 2)
CAUTION
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.
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.
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.
SSQ48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
Rload
Vin
SENSE (-)
Vout (-)
When using the remote sense 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.
CONTROL
INPUT
Fig. A: Circuit configuration for ON/OFF function.
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 Specification section for
logic high/low definitions.
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 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 hardwired directly to
Vin(-) to enable automatic power up of the converter
without the need of an external control signal.
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
The ON/OFF pin is internally pulled up to 5 V
through
a
resistor.
A
properly de-bounced
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 0.5 mA
at a low level voltage of ≤ 0.8 V. An external voltage
source (±20 V maximum) may be connected directly
MAY 16, 2006 revised to JUN 16, 2006
Page 4 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
actual output power remains at or below the
Note:
maximum allowable output power.
The above equations for calculation of trim resistor values
match those typically used in conventional industry-standard
quarter-bricks, eighth-bricks and sixteenth-bricks.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
addition of an externally connected resistor.
SSQ48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
(Top View)
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.
Rload
Vin
RT-DECR
SENSE (-)
Vout (-)
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:
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 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:
5.11× VO−NOM × (100 + Δ) 511
⎡
⎤
RT−INCR
=
−
−10.22 [kꢀ]
⎢
⎥
1.225Δ
Δ
⎣
⎦
where,
RT−INCR = Required value of trim-up resistor [kꢀ]
VO−NOM = Nominal value of output voltage [V]
[V]
[VOUT(+)−VOUT(−)]−[VSENSE(+)−VSENSE(−)] ≤ VO- NOMX10%
(VO-REQ − VO-NOM)
Δ =
X 100 [%]
VO -NOM
This equation is applicable for any condition of
output sensing and/or output trim.
VO−REQ = Desired (trimmed) output voltage [V].
Protection Features
SSQ48 Converter
Vin (+)
ON/OFF
Vin (-)
Vout (+)
SENSE (+)
TRIM
Input Undervoltage Lockout
(Top View)
RT-INCR
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage.
Rload
Vin
SENSE (-)
Vout (-)
The input voltage must be typically 33.7 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 29 V. This feature is beneficial
in preventing deep discharging of batteries used in
telecom applications.
Fig. C: Configuration for increasing output voltage.
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.
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. Typically, when the output voltage drops
below 40% of the nominal output voltage, the
converter will shut down.
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:
511
⎡
⎤
RT−DECR
=
− 10.22
[kꢀ]
⎢
⎥
Δ
⎣
⎦
where,
Once the converter has shut down, it will attempt to
restart nominally every 200 ms with a typical 3-5%
duty cycle. The attempted restart will continue
indefinitely until the overload or short circuit
conditions are removed.
RT−DECR = Required value of trim-down resistor [kꢀ]
and Δ is defined above.
MAY 16, 2006 revised to JUN 16, 2006
Page 5 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Once the output current is brought back into its
specified range, the converter automatically exits the
hiccup mode and continues normal operation.
The robustness of the unit to system generated
noise can be improved by adding common mode
capacitance around the unit. Such capacitors (rated
to withstand the appropriate isolation voltage) can be
added between Vin(+) to Vout(+), and/or Vin(-) to
Vout(-) for rejecting any common mode noise.
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. The converter can be
restarted by toggling the ENABLE input or by
subjecting the unit to a power cycle.
Characterization
General Information
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 or horizontal
mounting, efficiency, startup and shutdown
parameters, output ripple and noise, transient
response to load step-change, overload, and short
circuit.
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.
The following pages contain specific plots or
waveforms associated with the converter. Additional
comments for specific data are provided below.
Safety Requirements
Test Conditions
The converter meets North American and
International safety regulatory requirements per
UL60950 and EN60950 (pending). Basic Insulation is
provided between input and output.
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.
To comply with safety agencies’ requirements, an
input line fuse must be used external to the
converter. A 4 A fuse is recommended for use with
this product.
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.
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,
All measurements requiring airflow were made in the
vertical and horizontal wind tunnels 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
Information
technology
equipment
-
Radio
disturbance characteristics-Limits and methods of
measurement.
An effective internal LC differential filter significantly
reduces input reflected ripple current, and improves
EMC.
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. E for the
optimum measuring thermocouple locations.
With the addition of a simple external filter, all
versions of the SSQ48 Series of converters pass the
requirements of Class B conducted emissions per
EN55022 and FCC requirements. Please contact
Power-One Applications Engineering for details of
this testing.
MAY 16, 2006 revised to JUN 16, 2006
Page 6 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Efficiency
Efficiency vs. load current plot is shown in Fig. 2
for ambient temperature of 25 ºC, airflow rate of
200 LFM (1.5 m/s), vertical converter mounting, and
input voltages of 36 V, 48 V, and 75 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. 3.
Power Dissipation
Fig. 4 shows the power dissipation vs. load current
plot for Ta = 25 ºC, airflow rate of 200 LFM (1.5 m/s)
with horizontal mounting and input voltages of 36 V,
48 V, and 75 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
Fig. E: Locations of the thermocouple for thermal testing.
Thermal Derating
Load current vs. ambient temperature and airflow
rates are given in Fig. 1. Ambient temperature was
varied between 25 °C and 85 °C, with airflow rates
from 30 to 400 LFM (0.15 to 2.0 m/s), and vertical
converter mounting.
vertical mounting is shown in Fig. 5.
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 Fig. 6 and Fig. 7,
respectively.
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
specified temperature of 125 °C s indicated by the
thermographic image, or
a
maximum
Ripple and Noise
Fig. 10 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 µF ceramic capacitor.
(ii) The temperature of the transformer does not
exceed 125 °C, or
(iii) The nominal rating of the converter (20 A).
During normal operation, derating curves should not
be exceeded. The temperature at thermocouple
locations shown in Fig. E should not exceed 125 °C
in order to operate inside the derating curves.
The input reflected-ripple current waveforms are
obtained using the test setup shown in Fig. 11. The
corresponding waveforms are shown in Fig. 12 and
Fig. 13, respectively.
MAY 16, 2006 revised to JUN 16, 2006
Page 7 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 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. F.
ON/OFF
STATE
Time
Comments
OFF
ON
t0
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 30 ms.
t
t0
t1 t2
t3
Fig. F: Startup scenario #1.
VIN
Scenario #2: Initial Startup Using ON/OFF Pin
With VIN previously powered, converter started via
ON/OFF pin. See Figure. G.
Time
t0
t1
Comments
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.
VOUT
For this example, the total converter startup time (t3 - t1) is
typically 25 ms.
t
t0
t1 t2
t3
Fig. G: Startup scenario #2.
MAY 16, 2006 revised to JUN 16, 2006
Page 8 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
25
20
15
10
5
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)
0
20
30
40
50
60
70
80
90
Ambient Temperature [°C]
Fig. 1 : Available load current vs. ambient air temperature and
airflow rates for converter with height pins mounted
B
vertically with air flowing from pin 3 to pin 1 and maximum
FET temperature ≤ 125 °C, Vin = 48 V.
Note: NC – Natural convection
0.95
0.85
0.75
0.65
0.55
0.45
0.95
0.85
0.75
75 V
48 V
36 V
70 C
55 C
40 C
0.65
0.55
0
4
8
12
16
20
24
0
4
8
12
16
20
24
Load Current [Adc]
Load Current [Adc]
Fig. 3: Efficiency vs. load current and ambient temperature
for 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: Efficiency vs. load current and input voltage for
converter mounted vertically with air flowing from pin 3 to
pin 1 at a rate of 200 LFM (1.5 m/s), and Ta = 25 °C.
MAY 16, 2006 revised to JUN 16, 2006
Page 9 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
10.00
8.00
6.00
4.00
2.00
0.00
8.00
6.00
4.00
75 V
48 V
36 V
70 C
55 C
40 C
2.00
0.00
0
4
8
12
16
20
24
0
4
8
12
16
20
24
Load Current [Adc]
Load Current [Adc]
Fig. 4: Power dissipation vs. load current and input voltage
for converter mounted vertically with air flowing from pin 3 to
pin 1 at a rate of 200 LFM (1.5 m/s), and Ta = 25 °C.
Fig. 5: Power dissipation vs. load current and ambient
temperature for 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. 7: 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: 5 ms/div.
Fig. 6: 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: 5 ms/div.
MAY 16, 2006 revised to JUN 16, 2006
Page 10 of 13
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SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Fig. 8: Output voltage response to load current step-
Fig. 9: Output voltage response to load current step-
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (200 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 1 A/μs. Co = 270 μF OSCON +
1 μF ceramic. Time scale: 0.2 ms/div.
change (10 A – 20 A – 10 A) at Vin = 48 V. Top trace: output
voltage (200 mV/div.). Bottom trace: load current
(10 A/div.). Current slew rate: 0.1 A/μs. Co = 10 μF tantalum
+ 1 μF ceramic. Time scale: 0.2 ms/div.
iS
iC
10 μH
source
inductance
SSQ48
33 μF
1 μF
ceramic
capacitor
ESR < 1
electrolytic
capacitor
DC-DC
Converter
Vout
Vsource
Fig. 11: Test Setup for measuring input reflected ripple
Fig. 10: 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.
currents, ic and is.
MAY 16, 2006 revised to JUN 16, 2006
Page 11 of 13
www.power-one.com
SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Fig. 12: Input reflected ripple current, ic (200 mA/div.),
Fig. 13: Input reflected ripple current, is (10 mA/div.),
measured through 10 μH at the source at full rated load
current and Vin = 48 V. Time scale: 1 μs/div. Refer to
Fig. 11 for test setup.
measured at input terminals at full rated load current and
Vin = 48 V. Time scale: 1 μs/div. Refer to Fig. 11 for test
setup.
3
Vout
2.5
2
1.5
1
0.5
0
0
5
10
15
20
25
30
35
Iout [Adc]
Fig. 15: Load current (top trace, 10 A/div., 50 ms/div.) into a
10 mΩ short circuit during restart, at Vin = 48 V. Bottom
trace (10 A/div., 1 ms/div.) is an expansion of the on-time
portion of the top trace.
Fig. 14: Output voltage vs. load current showing current
limit point and converter shutdown point.
MAY 16, 2006 revised to JUN 16, 2006
Page 12 of 13
www.power-one.com
SSQ48T20025 DC-DC Converter Data Sheet
36-75 VDC Input, 2.5 VDC @ 20 A Output
Physical Information
Pad/Pin Connections
Pad/Pin #
Function
1
2
3
4
5
6
7
8
Vin (+)
ON/OFF
Vin (-)
Vout (-)
Sense(-)
Trim
Sense(+)
Vout (+)
SSQ48T Platform Notes
HT
CL
PL
•
•
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: Brass
Pin Finish: Matte Tin over Nickel
Converter Weight: 0.422 oz [11.95 g]
Pin
Option
Height
(Max. Height) (Min. Clearance)
Option +0.000 [+0.00]
Pin Length
+0.010 [+0.25]
-0.000 [- 0.00]
±0.005 [±0.13]
•
-0.035 [- 0.89]
A
B
C
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
B
0.400 [10.16]
0.036 [0.914]
•
•
•
Converter Part Numbering/Ordering Information
Rated
Load
Current
Product
Series
Input
Voltage
Mounting
Scheme
Output
Voltage
ON/OFF
Logic
Maximum
Height [HT] Length [PL] Features
Pin
Special
Environmental
G
SSQ
48
T
20
025
-
N
B
A
0
Through
hole
N ⇒
Through
hole
Negative
1/16th
Brick
Format
T⇒
Through-
hole
G ⇒ RoHS
compliant for all six
substances
20 ⇒ 20 A 025 ⇒ 2.5 V
0 ⇒ STD
36-75 V
A ⇒ 0.188”
B ⇒ 0.145”
C ⇒ 0.110”
B ⇒ 0.400”
P ⇒
Positive
The example above describes P/N SSQ48T20025-NBA0G: 36-75 VDC input, through-hole mounting, 20 A @ 2.5 VDC output, negative
ON/OFF logic, a maximum height of 0.400”, a through the board pin length of 0.188”, standard trim equations, and RoHS compliant. Please
consult factory for the complete list of available options.
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.
MAY 16, 2006 revised to JUN 16, 2006
Page 13 of 13
www.power-one.com
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