LAST TIME BUY: AUGUST 31, 2014. CLICK HERE FOR OBSOLESCENCE NOTICE OF FEBRUARY 2014.
UCE Series
www.murata-ps.com
Isolated, High-Density, Eighth-Brick
Low Profile DC-DC Converters
FEATURES
Industry standard eighth-brick pinout
and package
Typical unit
Low profile 0.4" height with 0.9" x 2.3"
outline dimensions
For efficient, fully isolated DC power in the smallest space, the UCE
open frame DC-DC converter series fit in industry-standard “eighth
brick” outline dimensions and mounting pins (on quarter-brick pinout).
36 to 75 Vdc input range (48V nominal)
NOT RECOMMENDED
Fully isolated, 2250 Vdc (BASIC)
insulation
PRODUCT OVERVIEW
Outstanding thermal performance
and derating
FOR NEW DESIGNS
Units are offered with fixed 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 airflow) with full rated
power. Interleaved synchronous rectifier topology
yields excellent efficiency 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.
Extensive self-protection and short
circuit features with no output reverse
conduction
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 certifica-
tions and BASIC I/O insulation provides input/output
isolation to 2250V. Radiation emission testing is
performed to widely-accepted EMC standards.
On/Off control, trim and sense functions
Interleaved synchronous rectification
yields high efficiency over 90%
Fully protected against temperature and
voltage limits
RoHS-6 or RoHS-5 compliant
Certified to UL/EN/IEC 60950-1 and
CAN/CSA C22.2 No. 60950-1, 2nd Edition
safety approvals
SIMPLIFIED BLOCK DIAGRAM
+SENSE
(7)
+VIN
(1)
+VOUT
(8)
SWITCH
CONTROL
−VOUT
(4)
–VIN
(3)
−SENSE
(5)
INPUT UNDERVOLTAGE, INPUT
OVERVOLTAGE, AND OUTPUT
OVERVOLTAGE COMPARATORS
PULSE
TRANSFORMER
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
V
OUT TRIM
(6)
REMOTE
ON/OFF
CONTROL
(2)
Typical topology is shown.
Figure 1. Simplified Block Diagram
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
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