
UCE Series
Isolated, High-Density, Eighth-Brick
Low Prole DC/DC Converters
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
email: sales@murata-ps.com
Figure 1. Simplied Block Diagram
04 May 2010
MDC_UCE.A27 Page 1 of 16
FEATURES
■ RoHS-6 or RoHS-5 compliant
■ Industry standard eighth-brick pinout
and package
■ Outputs from 1.5V to 12V up to 120W
■ Low prole 0.4" height with 0.9" x 2.3"
outline dimensions
■ 36 to 75 Vdc input range (48V nominal)
■ Fully isolated, 2250 Vdc (BASIC)
insulation
■ Outstanding thermal performance
and derating
■ Extensive self-protection and short
circuit features with no output reverse
conduction
■ On/Off control, trim and sense functions
■ Interleaved synchronous rectication
yields high efciency over 90%
■ Fully protected against temperature and
voltage limits
■ Certied to UL/EN/IEC 60950-1 and
CAN/CSA C22.2 No. 60950-1, 2nd Edition
safety approvals
Units are offered with xed output voltages from
1.5 to 12 Volts and currents up to 30 Amps. UCEs
operate over a wide temperature range (up to +85
degrees Celsius at moderate airow) with full rated
power. Interleaved synchronous rectier topology
yields excellent efciency over 90% and no reverse
output conduction.
UCEs achieve these impressive mechanical and
environmental specs while delivering excellent
electrical performance in a through-hole package.
Overall noise is typically 50 mV pk-pk (low voltage
models) with fast step response. These converters
offer tight output regulation and high stability even
with no load. The unit is fully protected against
input undervoltage, output overcurrent and short
circuit. An on-board temperature sensor shuts
down the converter if thermal limits are reached.
“Hiccup” output protection automatically restarts
the converter when the fault is removed.
A convenient remote On/Off control input enables
phased startup and shutdown in multi-voltage ap-
plications. To compensate for longer wiring and to
retain output voltage accuracy at the load, UCEs em-
ploy a Sense input to dynamically correct for ohmic
losses. A trim input may be connected to a user’s
adjustment potentiometer or trim resistors for output
voltage calibration. The UCE will tolerate substantial
capacitive loading for bypass-cap applications.
UCEs include industry-standard safety certica-
tions and BASIC I/O insulation provides input/output
isolation to 2250V. Radiation emission testing is
performed to widely-accepted EMC standards.
PRODUCT OVERVIEW
Typical unit
Typical topology is shown.
For efcient, fully isolated DC power in the smallest space, the UCE
open frame DC/DC converter series t in industry-standard “eighth
brick” outline dimensions and mounting pins (on quarter-brick pinout).
+VIN
(2)
(8)
(3)
(1)
(7)
–VIN
OPTO
ISOLATION
REFERENCE &
ERROR AMP
PULSE
TRANSFORMER
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
REMOTE
ON/OFF
CONTROL
+VOUT
(4)
VOUT
(6)
VOUT TRIM
+SENSE
(5)
SENSE
SWITCH
CONTROL
PWM
CONTROLLER
SIMPLIFIED BLOCK DIAGRAM