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UEI30 Series
30W Isolated Wide-Range DC-DC Converters
MDC_UEI Series 30W.B02 Page 1 of 18
Featuring a full 30 Watt output in 1.8 square inches of board area, the UEI
series isolated DC/DC converter family offers efficient regulated DC
power for printed circuit board mounting.
SIMPLIFIED SCHEMATIC
GATE
DRIVE
OPTO
ISOLATION
Control
Reference, trim &
Error Amplifier
+V
IN
+V
OUT
–V
OUT
–V
IN
On/Off
Control
TRIM
ISOLATION
BARRIER
Typical topology is shown.
Typical unit
Wide range 4:1 inputs on the 0.92" x 1.92" x 0.35"
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 tightly
regulated and may be trimmed within ±10%
of nominal output. Applications include small
instruments, computer-based systems, data com-
munications equipment, remote sensor systems,
vehicle and portable electronics.
The UEI 30W Series includes full magnetic
and optical isolation up to 2250 Volts DC (basic
insulation), Q48 models. 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 compatibility to circuits using CPU’s, ASIC’s,
programmable logic and FPGA’s. No minimum
load is required. For systems requiring controlled
startup/shutdown, an external switch, transistor
or digital logic may be used to activate the remote
On/Off control.
A wealth of self-protection features avoid both
converter and external circuit problems. These
include input undervoltage lockout and overtem-
perature 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 OVERVIEWFEATURES
Small footprint DC/DC converter, ideal for high
current applications
0.92" x 1.92" x 0.35" open frame package
Wide range input voltages 9-36 and 18-75Vdc
Assembly and attachment for RoHS-6 hazardous
substance compliance
Isolation up to 2250 VDC (basic), Q48 models
Up to 30W 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; see derating
Certifi ed to UL60950-1, CSA-C22.2 No. 234
safety approvals, and CE marking on 48V input
only
Extensive self-protection shut down features
RoHS-6 hazardous substance compliant
Typical uni
(48V input only)
