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UEI Series
50-60W Isolated Wide-Range DC/DC Converters
MDC_UEI Series 50-60W.C10 Page 1 of 14
SIMPLIFIED SCHEMATIC
Featuring a full 50-60 Watt output in 2.9 square inches of board area,
the UEI series isolated DC/DC converter family offers efficient
regulated DC power for printed circuit board mounting.
GATE
DRIVE
OPTO
ISOLATION
Control
Reference, trim &
Error Amplifier
+V
IN
+V
OUT
–V
OUT
–V
IN
On/Off
Control
TRIM
–SENSE
+SENSE
ISOLATION
BARRIER
Typical topology is shown.
Typical unit
Wide range 4:1 inputs on the 1.50" x 1.90" x
0.38" converter are either 9 to 36 Volts DC (Q12
models) or 18 to 75 Volts DC (Q48 models), ideal
for battery-powered and telecom equipment.
Fixed output voltages from 3.3 VDC to 15 VDC are
regulated to within ±0.05% and may be trimmed
within ±10% of nominal output. Applications
include small instruments, computer-based
systems, data communications equipment, remote
sensor systems, vehicle and portable electronics.
The UEI 50-60W Series includes full magnetic
and optical isolation up to 2250 Volts DC (basic
insulation). For connection to digital systems, the
outputs offer fast settling to current step loads
and tolerance of higher capacitive loads. Excellent
ripple and noise specifi cations assure compatibil-
ity to circuits using CPU’s, ASIC’s, programmable
logic and FPGA’s. No minimum load is required.
For systems requiring controlled startup/shut-
down, an external switch, transistor or digital logic
may be used to activate the remote On/Off control.
Remote Sense inputs compensate for resistive line
drops at high currents.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout, input overvolt-
age and overtemperature shutdown. The outputs
current limit using the “hiccup” autorestart
technique and the outputs may be short-circuited
indefi nitely. Additional features include output
overvoltage and reverse conduction elimination.
The synchronous rectifi er forward topology offers
high effi ciency for minimal heat buildup and “no
fan” operation.
PRODUCT OVERVIEW
FEATURES
Small footprint DC/DC converter, ideal for high
current applications
Industry standard 1.50˝ x 1.90˝ x 0.38˝ open
frame package and pinout
Wide range input voltages 9-36 and 18-75Vdc
Assembly and attachment for RoHS standards
Isolation up to 2250 VDC (basic)
Up to 50-60W total output power with
overtemperature shutdown
High effi ciency synchronous rectifi er forward
topology
Stable no-load operation with no required
external components
–40 to +85°C temperature range with derating
Certifi ed to UL60950-1, CSA-C22.2 No. 234,
EN60950-1, 2nd Edition safety approvals
Extensive self-protection shut down features
RoHS-6 compliant
Figure 1. Simplifi ed block diagram
