GE
QSDW035A0B Series Power Modules; DC-DC Converters
36Vdc –75Vdc Input; 12Vdc Output; 35A Output Current
Features
Data Sheet
Compliant to RoHS EU Directive 2002/95/EC (-Z versions)
Compatible with reflow pin/paste soldering process
High efficiency – 95.5% at 12V
dc
, 50% load to 100% load
Wide Input voltage range: 36-75V
dc
Delivers up to 35A
dc
output current
Output Voltage adjust: 5.0V
dc
to 13.2V
dc
Tightly regulated output voltage
Low output ripple and noise
Industry standard, DOSA compliant, Quarter brick:
58.4mm x 36.8 mm x 10.7 mm
(2.30in x 1.45 in x 0.42 in)
Constant switching frequency
Digital interface with PMBus™ Rev.1.2 compliance
Positive Remote On/Off logic
Output over current/voltage protection
Over temperature protection
Wide operating temperature range (-40°C to 85°C)
UL* 60950-1, 2nd Ed. Recognized, CSA
†
C22.2 No.
60950-1-07 Certified, and VDE
‡
(EN60950-1, 2nd
Ed.) Licensed
CE mark 2006/96/EC directives
§
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 and ISO14001 certified manufacturing facilities
RoHS Compliant
Applications
Distributed power architectures
Intermediate bus voltage applications
Servers and storage applications
Networking equipment including Power over Ethernet
(PoE)
Fan assemblies other systems requiring a tightly
regulated output voltage
Options
Negative Remote On/Off logic (1=option code, factory
preferred)
PMBus communication option
Auto-restart after fault shutdown (4=option code,
factory preferred)
Base plate option (-H=option code)
Passive Droop Load Sharing (-P=option code)
Description
The QSDW035A0B series of dc-dc converters are a new generation of DC/DC power modules designed to support 9.6 -12V
dc
intermediate bus applications where multiple low voltages are subsequently generated using point of load (POL) converters, as
well as other application requiring a tightly regulated output voltage. The QSDW035A0B series operate from an input voltage
range of 36 to 75V
dc
, and provide up to 35A output current
at output voltages from 5.0V
dc
to 12.0V
dc
. The 12V output is well
regulated for the entire input voltage range. The QSDW035A0B has improved line transient performance as compared to earlier
generation modules.
The converter incorporates digital control, synchronous rectification technology, and innovative packaging
techniques to achieve efficiency reaching 96% peak at 12V
dc
output. This leads to lower power dissipation, such that, for many
applications a heat sink is not required.
Standard features include output voltage trim, remote sense, on/off control, output
overcurrent and over voltage protection, over temperature protection, input under and over voltage lockout, power good signal
and PMBus interface.
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.
January 23, 2015
©2012 General Electric Company. All rights reserved.
Page 1
GE
QSDW035A0B Series Power Modules; DC-DC Converters
36Vdc –75Vdc Input; 12Vdc Output; 35A Output Current
Absolute Maximum Ratings
Data Sheet
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
Operating Input transient slew rate, 50V
IN
to 75V
IN
(Output may exceed regulation limits, no protective
shutdowns shall activate, C
O
=220μF to C
O, max
)
Non- operating continuous
Operating Ambient Temperature
(See Thermal Considerations section)
Storage Temperature
All
All
V
IN
-0.3
75
100
-
V
IN
T
A
T
stg
-
80
-40
-55
5
100
85
125
V
dc
V
dc
V/µs
V
dc
°C
°C
V
dc
Device
Symbol
Min
Max
Unit
I/O Isolation Voltage (100% factory Hi-Pot tested)
All
2250
* Input over voltage protection will shut down the output voltage when the input voltage exceeds threshold level.
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
)
Input No Load Current
(V
IN
= V
IN, nom
, I
O
= 0, module enabled)
Input Stand-by Current
(V
IN
= V
IN, nom
, module disabled)
External Input Capacitance
Inrush Transient
Input Terminal Ripple Current
(Measured at module input pin with maximum specified
input capacitance and
<
500uH inductance between
voltage source and input capacitance C
IN
=220uF, 5Hz to
20MHz, V
IN
= 48V, I
O
= I
Omax
)
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
IN
= 48V, I
O
=
I
Omax
; see Figure 11)
Input Ripple Rejection (120Hz)
Device
Symbol
V
IN
I
IN,max
All
All
All
All
I
2
t
I
IN,No load
I
IN,stand-by
100
-
-
-
Min
36
-
Typ
48
-
87
30
-
1
Max
75
13.5
Unit
V
dc
A
dc
mA
mA
μF
A
2
s
All
-
450
-
mA
rms
All
All
-
-
50
50
-
-
mA
p-p
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 25A (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.
January 23, 2015
©2012 General Electric Company. All rights reserved.
Page 2
GE
QSDW035A0B Series Power Modules; DC-DC Converters
36Vdc –75Vdc Input; 12Vdc Output; 35A Output Current
Electrical Specifications
(continued)
Data Sheet
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter
Output Voltage Set-point (Default)
(V
IN
=V
IN,nom
, I
O
=17.5A, T
A
=25°C)
(Adjustable via PMBus)
Output Voltage
(Over all operating input voltage, resistive load, and
temperature conditions until end of life)
Output Regulation
Line
Load
Line
Load, Intentional Droop
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
, tested with a 1.0
μF
ceramic, 10
μF
aluminum and 220μF polymer
capacitor across the load.)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Output Capacitance
(For Co >5000µF, Io must be < 50% Io,max during Trise)
Output Current
VOUT_OC_FAULT_LIMIT (Default)
(Adjustable via PMBus)
Efficiency (V
IN
=V
IN, nom
, V
O
= V
O,set
, T
A
=25°C)
I
O
= 100% I
O, max
I
O
= 55% - 90% I
O, max
Switching Frequency (primary MOSFETs)
(Output Ripple 2X switching frequency)
Dynamic Load Response
(dIo/dt=1A/10µs; V
in
=V
in
,nom; T
A
=25°C; tested with a
10
μF
ceramic and 470μF polymer 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 except -Q
-Q Option
All
All
All
All
220
6000
0
70
200
42
95.5
95.7
150
10,000
15,000
35
mV
rms
mV
pk-pk
μF
A
dc
A
dc
%
%
kHz
All w/o -P
All w/o -P
-P Option
-P Option
All
0.2
0.2
0.5
0.50
2
% V
O, set
% V
O, set
% V
O, set
V
dc
% V
O, set
Device
Standard
All w/o -P
-P Option
Symbol
V
O, set
V
O
V
O
Min
11.97
11.76
11.63
Typ
12.00
Max
12.03
12.24
12.37
Unit
V
dc
V
dc
V
dc
C
O
I
o
I
O,lim
η
η
f
sw
All
V
pk
t
s
V
pk
t
s
__
__
__
750
800
750
800
__
__
mV
pk
µs
mV
pk
µs
January 23, 2015
©2012 General Electric Company. All rights reserved.
Page 3
GE
QSDW035A0B Series Power Modules; DC-DC Converters
36Vdc –75Vdc Input; 12Vdc Output; 35A Output Current
General Specifications
Parameter
Calculated Reliability Based upon Telcordia SR-332 Issue
2: Method I, Case 3, (I
O
=80%I
O, max
, T
A
=40°C, Airflow = 200
LFM), 90% confidence
Weight – Open Frame
Weight – with Base plate option
Device
All
All
Symbol
MTBF
FIT
Data Sheet
Typ
2704374
369.8
49.6 (1.75)
69.2 (2.44)
Unit
Hours
10
9
/Hours
g (oz.)
g (oz.)
Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
Symbol
C
iso
R
iso
Min
10
Typ
2000
Max
Unit
pF
MΩ
January 23, 2015
©2012 General Electric Company. All rights reserved.
Page 4
GE
QSDW035A0B Series Power Modules; DC-DC Converters
36Vdc –75Vdc Input; 12Vdc Output; 35A Output Current
Feature Specifications
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 Time (I
O
=I
O, max,
Adjustable via
PMBus)
T
delay
=Time until V
O
= 10% of V
O,set
from either
application of Vin with Remote On/Off set to On
(Enable with Vin); or operation of Remote On/Off from
Off to On with Vin already applied for at least 150 milli-
seconds (Enable with on/off).
* Increased T
delay
due to startup for parallel modules.
T
rise
=Time for V
O
to rise from 10% to 90% of V
O,set
, For
C
O
>5000uF, I
O
must be < 50% I
O, max
during T
rise
.
* Increased T
rise
when Vo exists at startup for parallel
modules.
Load Sharing Current Balance
(difference in output current across all modules with
outputs in parallel, no load to full load)
Remote Sense Range
Output Voltage Adjustment range (Adjustable via PMBus)
Output Overvoltage Protection
Overtemperature Protection
(See Feature Descriptions)
Input Undervoltage Lockout
(Adjustable via PMBus)
Turn-on Threshold
Turn-off Threshold
Input Overvoltage Lockout
Turn-off Threshold
Turn-on Threshold
Pull down resistance of PGOOD pin
Sink current capability into PGOOD pin (V
PG
=2.2V)
Data Sheet
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See
Feature Descriptions for additional information.
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
T
delay, Enable with
Vin
280
-0.3
2.0
310
0.8
14.5
10
14.5
μA
V
dc
V
dc
μA
V
dc
All w/o -P
All w/o-P
w/ -P
w/ -P
All w/o -
P
w/ -P
-P
Option
All
All
All
All
150
10
180*
40*
25
50*
3
ms
ms
ms
ms
ms
ms
A
V
dc
V
dc
V
dc
°C
T
delay
,
Enable with
T
delay
,
Enable with
Vin
on/off
T
delay
,
Enable with
on/off
T
rise
T
rise
I
diff
V
Sense
V
O, set
V
O,limit
T
ref
5.0
V
O,SET
+2.5V
0.5
13.2
V
O,SET
+5.0V
135
31
All
All
35
33
85
80
36
150
15
V
dc
V
dc
V
dc
V
dc
Ω
mA
January 23, 2015
©2012 General Electric Company. All rights reserved.
Page 5
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