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QBK025A0B1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Data Sheet
March 27, 2008
QBK025A0B Series DC-DC Converter Power Modules:
36- 55Vdc Input, 12Vdc Output and 25A Output Current
* 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.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS03-096 ver. 1.46
PDF name:
qbus_qbk025a0b_ds.pdf
Applications
Distributed power architectures
Servers and storage applications
Optical and Access Network Equipment
Enterprise Networks
Options
Negative logic, Remote On/Off
Active load sharing (Parallel Operation)
Baseplate option (-H)
Auto restart after fault shutdown
Case ground pin
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)
Delivers up to 25A Output current
High efficiency – 94% at 12V full load
Industry standard Quarter brick footprint
57.9mm x 36.8mm x 10.6mm
(2.28in x 1.45in x 0.42in)
Low output ripple and noise
Cost efficient open frame design
Intermediate input voltage range
Output overcurrent/voltage protection
Over-temperature protection
Single optimal regulated output
Wide operating temperature range (-40
0
C to 85
0
C)
Positive logic, Remote On/Off
Complies with and is licensed for Basic Insulation
rating per EN60950-1
CE mark meets 73/23/EEC and 93/68/EEC
directives
§
UL* 60950-1Recognized, CSA
†
C22.2 No. 60950-1-
03 Certified, and VDE
‡
0805:2001-12 (EN60950-1)
Licensed
ISO** 9001 and ISO 14001 certified manufacturing
facilities
Description
The QBK025A0B series of DC-DC converters are an expansion of a new generation of DC/DC power modules
designed to support 12Vdc intermediate bus applications where multiple low voltages are subsequently generated
using discrete/modular point of load (POL) converters. The QBK025A0B series provide up to 25A output current in
an industry standard quarter brick, which makes it an ideal choice for small space, high current and 12V
intermediate bus voltage applications. The converter incorporates synchronous rectification technology and
innovative packaging techniques to achieve efficiency reaching 94% 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.
RoHS Compliant
Data Sheet
March 27, 2008
QBK025A0B DC-DC Power Modules:
36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
LINEAGE POWER 2
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 the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage*
Continuous V
IN
-0.3 55 Vdc
Non- operating continuous V
IN
-0.3 75 Vdc
Operating Ambient Temperature All T
A
-40 85 °C
(See Thermal Considerations section)
Storage Temperature All T
stg
-55 125 °C
I/O Isolation Voltage (100% factory Hi-Pot tested) All
⎯ ⎯
1500 Vdc
* Input over voltage protection will shutdown 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 Device Symbol Min Typ Max Unit
Operating Input Voltage V
IN
36 48 55 Vdc
Maximum Input Current I
IN,max
- - 9.5 Adc
(V
IN
=0V to 55V, I
O
=I
O, max
)
Inrush Transient All I
2
t - - 1 A
2
s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
IN
=
48V, I
O
= I
Omax
; see Figure 9)
All - 24 - mAp-p
Input Ripple Rejection (120Hz) 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 a 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 15A (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.
Data Sheet
March 27, 2008
QBK025A0B DC-DC Power Modules:
36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point 12 V
O, set
12 V
dc
(V
IN
=V
IN,nom
, I
O
=15A, T
a
=25°C)
Output Voltage
V
O
11.4
⎯
12.6 V
dc
(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
) All
⎯
0.2
⎯
%V
o
Load (I
O
= I
O, min
to I
O, max
) All
⎯
3
⎯
%V
o
Temperature (T
ref
=T
A, min
to T
A, max
) All
⎯
150
⎯
mV
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) All
⎯
70
⎯
mV
rms
Peak-to-Peak (5Hz to 20MHz bandwidth) All
⎯
200
⎯
mV
pk-pk
External Capacitance All C
O, max
⎯ ⎯
10,000 μF
Output Current 12V I
o
0 25 Adc
Output Current Limit Inception (Hiccup Mode)
(V
o
= 90% V
o, set
)
12V I
O, lim
⎯
28.5
⎯
Adc
Efficiency 12V η __
94
⎯
%
V
IN
= 48V, T
A
=25°C, I
O
= I
O
,
max
Switching Frequency
f
sw
⎯
300
⎯
KHz
Dynamic Load Response
(dI
O
/dt=0.1A/μs; V
IN
=V
IN
,
nom
; T
A
=25°C)
Load change from I
O
= 50% to 75% of I
O, max
Peak Deviation
12V
V
pk
⎯
2
⎯
% V
O
Settling Time (V
O
<10% peak deviation)
t
s
⎯
200
⎯
μs
Load change from I
O
= 50% to 25% of I
O, max
,
Peak Deviation
12V
V
pk
⎯
2
⎯
% V
O
Settling Time (V
O
<10% peak deviation)
t
s
⎯
200
⎯
μs
Isolation Specifications
Parameter Symbol Min Typ Max Unit
Isolation Capacitance
C
iso
⎯
2000
⎯
pF
Isolation Resistance R
iso
10
⎯ ⎯
MΩ
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (I
O
=80% of I
O, max
, T
A
=25°C,
airflow=1m/s(200LFM))
2,600,000 Hours
Weight
⎯
44 (1.55) g (oz.)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

QBK025A0B1

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DC DC CONVERTER 12V 300W
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