UEI25-120-D48PM-C【PDF 1/24 页】36-75VIN 12VOUT 25W POS LOG SMD

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www.murata-ps.com

UEI25 Series

Single Output Isolated 25-Watt DC/DC Converters

Output (V)

Current (A)

Nominal Input (V)

Typical unit

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 ?xed output voltages

? Isolation up to 2250 VDC (basic)

? ? to 25 Watts total output power with exten-

sive self-protection shutdown features

? High ef?ciency synchronous recti?er forward

topology up to 91%

? Stable operation with no required external

components

3.3

PRODUCT OVERVIEW

Featuring a full 25 Watt output in one square inch

of board area, the UEI25 series isolated DC/DC

converter family offers ef?cient 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 ?ts larger 1" x 2" converters. The ?xed 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

7.5

2.1

offer fast settling to step transients and will accept

higher capacitive loads. Excellent ripple and noise

speci?cations 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 ef?ciency offers minimal heat buildup

and “no fan” operation.

? Usable -40 to 85°C temperature range (with

derating)

? Certi ?ed to UL 60950-1, CAN/CSA-C22.2 No.

60950-1, IEC60950-1, EN60950-1 safety

approvals, 2nd edition

External

Power

Source

+Vin (1)

On/Off

Control

(6)

Open = On

-Vin (2)

Controller

and Power

Barrier

Reference and

Error Ampli ?er

+Vout (3)

Trim (4)

-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

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