Data Sheet
February 16, 2009
QSW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with lead
solder exemption (non-Z versions)
High efficiency – 95% at 12V full load
Delivers up to 25A output current
Low output ripple and noise
Industry standard Quarter brick:
RoHS Compliant
Applications
Distributed power architectures
Intermediate bus voltage applications
Servers and storage applications
Networking equipment including Power over
Ethernet (PoE)
57.9 mm x 36.8 mm x 10.6 mm
(2.28 in x 1.45 in x 0.42 in)
Constant switching frequency
Positive Remote On/Off logic
Output over current/voltage protection
Over temperature protection
Wide operating temperature range (-40°C to 85°C)
UL*Recognized to UL60950-1, CAN/CSA C22.2
No.60950-1,
and EN60950-1(
VDE
‡
0805-1) Licensed
CE mark meets 2006/95/EC directive
§
†
Options
Negative Remote On/Off logic
Active load sharing (Parallel Operation)
Baseplate option (-H)
Auto restart after fault shutdown
Case ground pin
Meets the voltage and current requirements for ETSI
300-132-2 and complies with and licensed for Basic
insulation rating per EN60950-1
2250 Vdc Isolation tested in compliance with IEEE
¤
802.3 PoE standards
ISO** 9001 certified manufacturing facilities
Description
The QSW025A0B series of dc-dc converters are a new generation of DC/DC power modules designed to support
12Vdc intermediate bus applications where multiple low voltages are subsequently generated using point of load
(POL) converters. The QSW025A0B series are enhanced from their predecessor QBW025A0B series, with
improvements to the internal shutdown control, improved response to input voltage transients, and inclusion of output
reverse current protection during startup. The QSW025A0B series operate from an input voltage range of 36 to
75Vdc and provide up to 25A output current at 12V in an industry standard quarter brick. The converter incorporates
synchronous rectification technology and innovative packaging techniques to achieve efficiency reaching 95% at 12V
full load. This leads to lower power dissipations such that for many applications a heat sink is not required.
The output is fully isolated from the input, allowing versatile polarity configurations and grounding connections. Built-
in filtering for both input and output minimizes the need for external filtering.
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
‡
§
CSA
is a registered trademark of Canadian Standards Association.
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
This product is intended for integration into end-user equipment . All of the required procedures of end-use equipment should be followed.
Document No: DS08-008 ver 1.1
PDF Name: QSW025A0B_ds.pdf
Data Sheet
February 16, 2009
QSW025A0B Series Power Modules; DC-DC Converters
36 – 75Vdc Input; 12Vdc Output; 25A Output Current
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are
absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in
excess of those given in the operations sections of the Data Sheet. Exposure to absolute maximum ratings for
extended periods can adversely affect device reliability.
Parameter
Input Voltage*
Continuous
Operating transient
≤
100mS
Non- operating continuous
Operating Ambient Temperature
(See Thermal Considerations section)
Storage Temperature
All
T
stg
-55
125
°C
V
dc
I/O Isolation Voltage (100% factory Hi-Pot tested)
All
2250
⎯
⎯
* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.
All
V
IN
T
A
-0.3
-40
V
IN
-0.3
75
100
100
85
V
dc
V
dc
V
dc
°C
Device
Symbol
Min
Max
Unit
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter
Operating Input Voltage
Maximum Input Current
(V
IN
=0V to 75V, I
O
=I
O, max
)
Inrush Transient
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
IN
= 48V,
I
O
= I
Omax
; see Figure 9)
Input Ripple Rejection (120Hz)
All
All
It
2
Device
Symbol
V
IN
I
IN,max
Min
36
-
Typ
48
-
Max
75
10
Unit
V
dc
A
dc
2
-
-
-
24
1
-
As
mA
p-p
All
50
-
dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to an
integrated part of sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included,
however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies
require a fast-acting fuse with a maximum rating of 30 A (see Safety Considerations section). Based on the
information provided in this Data Sheet on inrush energy and maximum dc input current, the same type of fuse with a
lower rating can be used. Refer to the fuse manufacturer’s Data Sheet for further information.
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Data Sheet
February 16, 2009
QSW025A0B Series Power Modules; DC-DC Converters
36 – 75Vdc Input; 12Vdc Output; 25A Output Current
Electrical Specifications
(continued)
Parameter
Output Voltage Set-point
(V
IN
=V
IN,nom
, I
O
=15A, T
a
=25°C)
Device
All
Symbol
V
O, set
Min
Typ
12
Max
Unit
V
dc
Output Voltage
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Output Regulation
Line (V
IN
=V
IN, min
to V
IN, max
)
Load (I
O
=I
O, min
to I
O, max
)
Temperature (T
A
= -40ºC to +85ºC)
Output Ripple and Noise on nominal output
(V
IN
=V
IN, nom
and I
O
=I
O, min
to I
O, max
)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Capacitance
Output Current
Output Current Limit Inception
Efficiency
V
IN
=V
IN, nom
, T
A
=25°C
I
O
=I
O, max ,
V
O
= V
O,set
Switching Frequency (input ripple is ½ f
sw
)
Dynamic Load Response
(dIo/dt=1A/10μs; V
in
=V
in
,nom; T
A
=25°C; Tested
with a 10
μF
aluminum and a 1.0
μF
tantalum
capacitor across the load.)
Load Change from Io= 50% to 75% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
Load Change from Io= 75% to 50% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
All
All
All
All
All
All
All
All
All
All
V
O
11.4
⎯
12.6
V
dc
⎯
⎯
⎯
24
360
⎯
36
600
250
mV
mV
mV
⎯
⎯
C
O, max
I
o
I
O, lim
η
f
sw
0
0
⎯
⎯
⎯
33
100
⎯
65
200
20,000
25
mV
rms
mV
pk-pk
μF
A
dc
A
dc
%
kHz
30
95
300
⎯
⎯
⎯
V
pk
t
s
V
pk
t
s
⎯
__
550
500
⎯
__
mV
pk
μs
mV
pk
μs
__
__
550
500
__
Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Symbol
C
iso
R
iso
Min
⎯
10
Typ
1000
⎯
Max
⎯
⎯
Unit
pF
MΩ
General Specifications
Parameter
Calculated Reliability Based upon Telcordia SR-
332 Issue 2: Method
I,
Case 1, (I
O
=80%I
O, max
,
T
A
=40°C, Airflow = 200 lfm), 90% confidence
Weight – Open Frame
Weight – with Baseplate option
MTBF
FIT
Device
All
All
⎯
⎯
Min
Typ
2,651,917
337.1
49 (1.73)
64 (2.24)
⎯
⎯
Max
Unit
Hours
10 /Hours
g (oz.)
g (oz.)
9
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Data Sheet
February 16, 2009
Feature Specifications
QSW025A0B Series Power Modules; DC-DC Converters
36 – 75Vdc Input; 12Vdc Output; 25A Output Current
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter
Remote On/Off Signal Interface
(V
IN
=V
IN, min
to V
IN, max
, Signal referenced to V
IN-
terminal)
Negative Logic: device code suffix “1”
Logic Low = module On, Logic High = module
Off
Positive Logic: No device code suffix required
Logic Low = module Off, Logic High = module
On
Logic Low Specification
On/Off Thresholds:
Remote On/Off Current – Logic Low
Logic Low Voltage
Logic High Voltage – (Typ = Open Collector)
Logic High maximum allowable leakage
current
(V
on/off
= 2.0V)
Maximum voltage allowed on On/Off pin
Turn-On Delay and Rise Times
(I
O
=I
O, max
)
T
delay
= Time until V
O
= 10% of V
O,set
from either
application of Vin with Remote On/Off set to On
or operation of Remote On/Off from Off to On
with Vin already applied for at least one
second.
T
rise
= Time for V
O
to rise from 10% of V
O,set
to
90% of V
O,set
.
Output Overvoltage Protection (Clamp)
Overtemperature Protection
(See Feature Descriptions)
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Overvoltage Lockout
Turn-off Threshold
Turn-on Threshold
⎯
78
81
79
82
⎯
V
dc
V
dc
⎯
32
35
34
36
⎯
V
dc
V
dc
T
delay,
All
Enable with Vin
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
All
I
on/off
V
on/off
V
on/off
I
on/off
V
on/off
5
-0.3
2.0
⎯
⎯
10
⎯
⎯
⎯
⎯
15
0.8
3.5
4.0
13.5
μA
V
dc
V
dc
μA
V
dc
⎯
50
⎯
ms
T
delay
,
Enable with
All
All
All
on/off
⎯
40
13
⎯
20
65
⎯
125
⎯
75
15
⎯
ms
ms
V
dc
°C
T
rise
T
ref
4
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Data Sheet
February 16, 2009
Characteristic Curves
QSW025A0B Series Power Modules; DC-DC Converters
36 – 75Vdc Input; 12Vdc Output; 25A Output Current
The following figures provide typical characteristics for the QSW025A0B (12V, 25A) at 25ºC. The figures are identical
for either positive or negative Remote On/Off logic.
V
ON/OFF
(V) (2V/div)
V
O
(V) (5V/div)
9
INPUT CURRENT, I
i
(A)
8
7
6
5
4
3
2
1
0
30
35
40
45
50
55
60
65
70
75
Iout=0A
Iout=25A
Iout=12.5A
INPUT VOLTAGE, V
O
(V)
OUTPUT VOLTAGE
On/Off VOLTAGE
10
TIME, t (20 ms/div)
Figure 1. Typical Input Characteristic at Room
Temperature.
100
95
EFFCIENCY,
η
(%)
Figure 4. Typical Start-Up Using Remote On/Off,
negative logic version shown.
V
O
(V) (500mV/div)
I
O
(A) (10A/div)
90
85
80
75
0
Vin=36V
Vin=75V
Vin=48V
5
10
15
20
OUTPUT CURRENT, I
O
(A)
25
OUTPUT CURRENT OUTPUT VOLTAGE
TIME, t (500
μs/div)
Figure 2. Typical Converter Efficiency Vs. Output
current at Room Temperature.
Figure 5. Typical Transient Response to Step change
in Load from 25% to 50% to 25% of Full Load at Room
Temperature and 48 Vdc Input.
OUTPUT CURRENT OUTPUT VOLTAGE
36 Vin
OUTPUT VOLTAGE,
V
O
(V) (50mV/div)
48 Vin
60 Vin
I
O
(A) (10A/div)
V
O
(V) (500mV/div)
TIME, t (1μs/div)
TIME, t (500
μs/div)
Figure 3. Typical Output Ripple and Noise at Room
Temperature and I
o
= I
o,max
.
Figure 6. Typical Transient Response to Step Change
in Load from 50% to 75% to 50% of Full Load at Room
Temperature and 48 Vdc Input.
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