UEI25-120 Datasheet, PDF (1/11 Pages) Murata Manufacturing Co., Ltd. – Single Output Isolated 25-Watt DC/DC Converters

www.murata-ps.com
UEI25-120 Series
Single Output Isolated 25-Watt DC/DC Converters
Typical unit
FEATURES
„ Small footprint DC/DC converter, ideal for
high current applications
„ Industry standard 0.96" x 1.1" x 0.32" open
frame package and pinout
„ Input voltage range of 36-75 Vdc
„ 12Vdc fixed output
„ Assembly and attachment for RoHS standards
„ Isolation up to 2250 VDC (basic)
„ Up to 25 Watts total output power with over-
temperature shutdown
„ High efficiency synchronous rectifier forward
topology
„ Stable operation with no required external
components
„ Usable -40 to 85°C temperature range (with
derating)
„ Certified to UL/EN 60950-1, CSA-C22.2 No.
60950-1, 2nd edition safety approvals
(certification is pending)
„ Extensive self-protection shut down features
PRODUCT OVERVIEW
Featuring a full 25 Watt output in one square inch
of board area, the UEI25 series isolated DC/DC
converter family offers efficient regulated DC power
for printed circuit board mounting. The 0.96" x 1.1"
x 0.32" (24.38 x 27.94 x 8.13 mm) converter ac-
cepts a 2:1 input voltage range of 36 to 75 Volts DC,
ideal for telecom equipment. The industry-standard
pinout fits larger 1" x 2" converters. The fixed out-
put voltage is tightly regulated. Applications include
small instruments, area-limited microcontrollers,
data communications equipment, remote sensor
systems, telephone equipment, vehicle and portable
electronics.
The UEI25 series includes full magnetic and opti-
cal isolation with Basic protection up to 2250 Volts
DC. For powering digital systems, the outputs offer
fast settling to step transients and will accept higher
capacitive loads. Excellent ripple and noise speci-
fications assure compatibility to noise-susceptible
circuits. For systems requiring controlled startup/
shutdown, an external remote On/Off control may
use a switch, transistor or digital logic.
A wealth of self-protection features avoid both
converter and external circuit faults. These include
input undervoltage lockout and overtemperature
shutdown. The outputs current limit using the
“hiccup” autorestart technique and the outputs are
short-circuit protected. Additional features include
output overvoltage and reverse conduction elimina-
tion. The high efficiency offers minimal heat buildup
and “no fan” operation.
Contents
Page
Description, Photograph, Connection Diagram
1
Ordering Guide, Model Numbering
2
Mechanical Specifications, Input/Output Pinout
3
UEI25-120-D48 Specifications and Performance Data
4
Application Notes
8
F1
+Vin (1)
External
DC
Power
Source
On/Off
Control
(6)
Open = On
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polarity)
*TPMBUJPO
Barrier
Controller
and Power
5SBOTGFS
t
4XJUDIJOH
t
'JMUFST
t
$VSSFOU
4FOTF
Reference and
Error Amplifier
-Vin (2)
Ḥ
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
For full details go to
www.murata-ps.com/rohs
(certification is pending)
www.murata-ps.com
+Vout (3)
Trim (4)
-Vout (5)
email: [e-mail]
17 Aug 2010 MDC_UEI25-120.A02 Page 1 of 11