ULS Series
www.murata-ps.com
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
FEATURES
ꢀSmall footprint DC/DC converter, ideal for
high current applications
ꢀTiny 0.9" x 1.3" x 0.40" open frame package
Typical unit
ꢀIndustry standard DOSA "brick" format
and pinout
PRODUCT OVERVIEW
ꢀ36-75 Volts DC input range
The world of “brick” DC/DC converters has seen
a steady size reduction. The ULS series makes
another dramatic size shrink down to a “sixteenth- On/Off control may use a switch, transistor or digital
brick” width (0.9 inches) while still retaining a
66 Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
minimum load is required. For systems requiring
controlled startup/shutdown, an external remote
ꢀ2250 Volt Basic input/output isolation
(48V models)
ꢀUp to 66 Watts total output power with
overtemperature shutdown
logic. Remote Sense inputs compensate for resis-
tive line drops at high currents.
Many self-protection features on the ULS series
ꢀHigh efficiency synchronous rectifier forward
topology
36 to 75 Volts DC inputs and delivers fixed outputs avoid both converter and external circuit hazards.
regulated to within 0.2ꢀ. 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 10ꢀ of
nominal output while delivering fast settling to
current step loads and no adverse effects from
higher capacitive loads. Excellent ripple and noise
specifications assure compatibility to circuits using
CPU’s, ASIC’s, programmable logic and FPGA’s. No
These include input undervoltage lockout and
overtemperature shutdown. The outputs current
limit using the “hiccup” autorestart technique and
the outputs may be short-circuited indefinitely.
Additional features include output overvoltage and
reverse conduction elimination.
The synchronous rectifier forward topology yields
high efficiency for minimal heat buildup and “no
fan” operation.
ꢀStable no-load operation with no required
external components
ꢀOperating temperature range -40 to +85°C
with derating
ꢀUL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition
(pending)
ꢀExtensive self-protection shut down features
SIMPLIFIED BLOCK DIAGRAM
+SENSE
(7)
+Vin
(1)
+Vout
(8)
SWITCH
CONTROL
-Vout
(4)
-Vin
(3)
PULSE
TRANSFORMER
-SENSE
(5)
INPUT
UNDER VOLTAGE,
OVER TEMPERATURE,
AND OUTPUT
OVER VOLTAGE
COMPARATORS
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE
ERROR AMP
Vout
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
email: sales@murata-ps.com
19 Jul 2010 MDC_ULS Series.B16 Page 1 of 12