Data Sheet
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A Output Current
BARRACUDA SERIES™
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
High and flat efficiency profile >95.5% at 12V
dc
,
30% load to 100% output
Wide Input voltage range: 36-75V
dc
Delivers up to 33A
dc
output current
Fully very tightly regulated output voltage
Low output ripple and noise
Industry standard, DOSA Compliant Quarter Brick:
58.4 mm x 36.8 mm x 11.7 mm
(2.30 in x 1.45 in x 0.46 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* 60950-1, 2nd Ed. Recognized, CSA† C22.2 No.
60950-1-07 Certified, and VDE‡ (EN60950-1, 2nd
Ed.) Licensed
§
CE mark to 2006/96/EC directive
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 and other systems requiring a
tightly regulated output voltage
Options
Negative Remote On/Off logic (1=option code,
factory preferred)
Auto-restart after fault shutdown (4=option code,
factory preferred)
Remote Sense and Output Voltage Trim (9=option
code)
Base plate option (-H=option code)
Passive Droop Load Sharing (-P=option code)
Description
The QBVW033A0B series of dc-dc converters are a new generation of fully regulated DC/DC power modules
designed to support 12Vdc 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
QBVW033A0B series operate from an input voltage range of 36 to 75Vdc and provide up to 33A output current at
output voltages of 12V
dc
in an industry standard, DOSA compliant quarter brick. The converter incorporates digital
control, synchronous rectification technology, a fully regulated control topology, and innovative packaging techniques
to achieve efficiency exceeding 96% at 12V output. This leads to lower power dissipations such that for many
applications a heat sink is not required. Standard features include on/off control, output overcurrent and over voltage
protection, over temperature protection, input under and over voltage lockout.
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: ds10-018 ver 1.0
PDF Name: QBVW033A0B.pdf
Data Sheet
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A 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
80
-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
)
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 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)
All
Device
Symbol
V
IN
I
IN,max
I
IN,No load
I
IN,stand-by
100
It
2
Min
36
-
Typ
48
-
80
Max
75
12
Unit
V
dc
A
dc
mA
All
All
All
22
-
-
-
1
mA
μF
As
2
-
All
-
40
-
mA
p-p
All
-
25
-
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 in the ungrounded input lead of the power supply (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
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A Output Current
Electrical Specifications
(continued)
Parameter
Output Voltage Set-point
(V
IN
=V
IN,nom
, I
O
=16.5A, T
A
=25°C)
Output Voltage
(Over all operating input voltage (40V to 75V), resistive
load, and temperature conditions until end of life)
Output Regulation [V
IN, min
= 40V]
Line (V
IN
= V
IN, min
to V
IN, max
)
Load (I
O
=I
O, min
to I
O, max
)
Load (I
O
=I
O, min
to I
O, max
), 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
)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Output Capacitance
For C
O
>5000uF, I
O
must be < 50% I
O, max
during T
rise
.
Output Current
Output Current Limit Inception
Efficiency
V
IN
=V
IN, nom
, T
A
=25°C
I
O
=100% I
O, max,
V
O
= V
O,set
I
O
=40% I
O, max
to 75% I
O, max ,
V
O
= V
O,set
Switching Frequency
Dynamic Load Response
dI
O
/d
t
=1A/10s; V
in
=V
in
,
nom
; T
A
=25°C;
(Tested with a 1.0μF ceramic, a 10μF tantalum, and
470μF capacitor and across the load.)
Load Change from I
O
= 50% to 75% of I
O,max
:
Peak Deviation
Settling Time (V
O
<10% peak deviation)
Load Change from I
O
= 75% to 50% of I
O,max
:
Peak Deviation
Settling Time (V
O
<10% peak deviation)
All
V
pk
t
s
V
pk
t
s
__
500
700
__
mV
pk
s
mV
pk
s
All
All
All
All
All
C
O, max
I
O
I
O,lim
0
0
40
70
200
10,000
33
mV
rms
mV
pk-pk
μF
A
dc
A
dc
All
All w/o -P
-P Option
All
0.2
0.2
0.50
2
% V
O, set
% V
O, set
V
dc
% V
O, set
Device
All
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
All
All
η
f
sw
95.5
96.0
150
%
kHz
All
__
__
500
700
__
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 3, (I
O
=80%I
O, max
, T
A
=40°C,
Airflow = 200 LFM), 90% confidence
Weight – Open Frame
Weight – with Base plate option
Symbol
MTBF
FIT
Device
All
All
Typ
3,108,685
321.7
47.4 (1.67)
66.4 (2.34)
Unit
Hours
10 /Hours
g (oz.)
g (oz.)
9
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Data Sheet
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A Output Current
Feature Specifications
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 (Vin =100V)
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
(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 pre-bias Vo exists at startup for
parallel modules.
Remote Sense Range
Output Voltage Adjustment range
Output Overvoltage Protection
Overtemperature Protection
(See Feature Descriptions)
Input Undervoltage Lockout
Turn-on Threshold (Default)
Turn-off Threshold (Default)
Input Overvoltage Lockout
Turn-off Threshold (Default)
Turn-on Threshold (Default)
76
86
79
V
dc
V
dc
33
31
35
33
36
34
V
dc
V
dc
All w/o “P’
option
All w/o “P”
option
All w/ “P’
option
All w/ “P”
option
All w/o “P”
option
All w/ “P’
option
All w/ ”9”
option
All w/ ”9”
option
All w/o “9”
option
All w/ ”9”
option
All
T
delay Enable
,
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
280
-0.3
2.0
310
0.8
14.5
10
14.5
μA
V
dc
V
dc
μA
V
dc
with Vin
8.1
14.5
V
O,set
+2.5V
150
10
180*
40*
15
300*
0.5
13.2
17.0
V
O,set
+5.0V
ms
ms
ms
ms
ms
ms
V
dc
V
dc
V
dc
V
dc
°C
T
delay, Enable
with on/off
T
delay
,
Enable
with Vin
T
delay, Enable
with on/off
T
rise
T
rise
V
Sense
V
O, set
V
O,limit
V
O,limit
T
ref
140
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Data Sheet
September 23, 2011
QBVW033A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 33A Output Current
Characteristic Curves, 12V
dc
Output
The following figures provide typical characteristics for the QBVW033A0B (12V, 33A) at 25ºC. The figures are identical for
either positive or negative Remote On/Off logic.
INPUT CURRENT, I
i
(A)
INPUT VOLTAGE, V
O
(V)
EFFCIENCY,
η
(%)
OUTPUT CURRENT, I
O
(A)
Figure 1. Typical Input Characteristic.
Figure 2. Typical Converter Efficiency vs. Output
Current.
OUTPUT CURRENT OUTPUT VOLTAGE
I
O
(A) (10A/div
)
V
O
(V) (200mV/div)
OUTPUT VOLTAGE,
V
O
(V) (50mV/div)
TIME, t (2s/div)
TIME, t (500
μs/div)
Figure 3. Typical Output Ripple and Noise, I
o
= I
o,max
.
Figure 4. Typical Transient Response to 0.1A/µs
Step Change in Load from 50% to 75% to 50% of
Full Load, Co=470µF and 48 Vdc Input.
On/Off VOLTAGE
V
ON/OFF
(V)(2V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
V
IN
(V) (20V/div)
V
O
(V) (5V/div)
TIME, t (20 ms/div)
OUTPUT VOLTAGE
V
O
(V) (5V/div)
TIME, t (5 ms/div)
Figure 5. Typical Start-Up Using Vin with Remote
On/Off enabled, negative logic version shown.
Figure 6. Typical Start-Up Using Remote On/Off
with Vin applied, negative logic version shown.
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