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ULS 30-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FEATURES
?
? Small footprint DC/DC converter, ideal for
embedded applications
?
?
? 1.30" x 0.90" x 0.36" open frame package
? Industry standard DOSA "brick" format
and pinout with surface mount option
Typical units
?
?
? 2:1 Input Voltage Range (36V-75V, D48)
? 2250 Volt Basic input/output isolation
(48V models)
Up
? ? to 30 Watts total output power with
overtemperature shutdown
?
? High ef?ciency synchronous recti?er forward
topology
?
? Stable no-load operation with no required
external components
?
? Operating temperature range -40 to +85 ° C
with derating
?
? Certi ?ed to UL/EN/IEC 60950-1, CAN/CSA
C22.2 No. 60950-1, EN60950-1 safety
approvals, 2nd Edition
?
? Extensive self-protection shut down features
PRODUCT OVERVIEW
The world of “brick” DC/DC converters has seen
a steady size reduction. The ULS series makes an-
other dramatic size shrink down to a “sixteenth-
brick” width (0.91 inches) while still retaining up
to 30?Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
36?to 75 Volts DC inputs and delivers ?xed outputs
regulated to within ±0.125%. The ULS converters
are ideal for datacom and telecom applications,
cell phone towers, data centers, server farms and
network repeaters.
ULS outputs may be trimmed within -20% to
+10% of nominal output while delivering fast set-
tling to current step loads and no adverse effects
from higher capacitive loads. Excellent ripple and
noise speci?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
remote On/Off control may use a switch, transistor
or digital logic.
Many self-protection features on the ULS series
avoid both converter and external circuit hazards.
These include input undervoltage lockout and
overtemperature shutdown. The outputs current
limit using the “hiccup” autorestart technique and
the outputs may be short-circuited inde?nitely.
Additional features include output overvoltage and
reverse conduction elimination.
The synchronous recti?er forward topology
yields high ef?ciency for minimal heat buildup and
“no fan” operation.
F1
External
DC
Power
Source
+Vin (1)
On/Off
Control
(2)
Open = On
-Vin (3)
Controller
and Power
Barrier
Reference and
Error Ampli ?er
+Vout (8)
Trim (6)
-Vout (4)
*Sense is included on the ULS-3.3/8-D48 and ULS-5/6-D48 only .
Figure 1. Simpli?ed Block Diagram
Typical topology is shown
　
For full details go to
www.murata-ps.com/rohs
REG.-Nr. D216
www.murata-ps.com/support
MDC_ULS-30W_C06 Page 1 of 30
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