UEI25 Datasheet, PDF (1/23 Pages) Murata Manufacturing Co., Ltd. – Single Output Isolated 25-Watt DC/DC Converters

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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
Typical unit
Output (V)
3.3
5
12
Current (A)
7.5
5
2.1
Nominal Input (V)
48
48
48
FEATURES
„ Cost effective 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
„ 3.3V, 5V, or 12Vdc fixed output voltages
„ Isolation up to 2250 VDC (basic)
„ Up to 25 Watts total output power with exten-
sive self-protection shutdown features
„ High efficiency synchronous rectifier forward
topology up to 91%
„ _{Stable operation} with no required external
components
„ Usable -40 to 85°C temperature range (with
derating)
„ Certified to UL 60950-1, CAN/CSA-C22.2 No.
60950-1, IEC60950-1, EN60950-1 safety
approvals, 2nd edition
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" (24.4 x 27.9 x 8.1 mm) converter accepts a
2:1 input voltage range of 36 to 75 Volts DC, ideal
for telecom equipment. The industry-standard pin-
out fits larger 1" x 2" converters. The fixed output
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
optical 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
specifications assure compatibility to noise-sus-
ceptible 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.
F1
+Vin (1)
External
DC
Power
Source
On/Off
Control
(6)
Open = On
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polarity)
-Vin (2)
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For full details go to
www.murata-ps.com/rohs
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Barrier
Controller
and Power
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Reference and
Error Amplifier
Figure 1. Connection Diagram
Typical topology is shown. Murata Power Solutions
recommends an external fuse.
+Vout (3)
Trim (4)
-Vout (5)
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MDC_UEI25W.B03 Page 1 of 23