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
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
