UEI25 Series
www.murata-ps.com
Single Output Isolated 25-Watt DC/DC Converters
Output (V)
Current (A)
Nominal Input (V)
3.3
5
7.5
5
48
48
48
Typical unit
12
2.1
FEATURES
PRODUCT OVERVIEW
Featuring a full 25 Watt output in one square inch
of board area, the UEI25 series isolated DC/DC
offer fast settling to step transients and will accept
higher capacitive loads. Excellent ripple and noise
Cost effective small footprint DC/DC converter,
ideal for high current applications
converter family offers efficient regulated DC power specifications assure compatibility to noise-sus-
Industry standard 0.96" x 1.1" x 0.32" open
frame package and pinout
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
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
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
systems, telephone equipment, vehicle and portable short-circuit protected. Additional features include
High efficiency synchronous rectifier forward
topology up to 91%
electronics.
output overvoltage and reverse conduction elimina-
tion. The high efficiency offers minimal heat buildup
and “no fan” operation.
The UEI25 series includes full magnetic and
optical isolation with Basic protection up to 2250
Volts DC. For powering digital systems, the outputs
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
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F1
+Vin (1)
+Vout (3)
Barrier
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External
DC
Power
Source
On/Off
Control
(6)
Controller
and Power
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Open = On
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Reference and
Error Amplifier
Trim (4)
-Vin (2)
-Vout (5)
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
REG.-Nr. D806
www.murata-ps.com/support
MDC_UEI25W.B09 Page 1 of 24