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ULS 60-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC/DC Converters
MDC_ULS Series.C02 Page 1 of 24
FEATURES
nSmall footprint DC/DC converter, ideal for
high current applications
nTiny 0.9" x 1.3" x 0.40" open frame package
nIndustry standard DOSA "brick" format
and pinout with surface mount option
n36-75 Volts DC input range
n2250 Volt Basic input/output isolation
(48V models)
nUp to 66 Watts total output power with
overtemperature shutdown
nHigh efficiency synchronous rectifier forward
topology
nStable no-load operation with no required
external components
nOperating temperature range -40 to +85°C
with derating
nCertified to UL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition
nExtensive self-protection shut down features
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-
brick” width (0.9 inches) while still retaining up
to 66Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
36to 75 Volts DC inputs and delivers fixed outputs
regulated to within ±0.2%. 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 ±10% 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
minimum load is required. For systems requiring
controlled startup/shutdown, an external remote
On/Off control may use a switch, transistor or digital
logic. Remote Sense inputs compensate for resis-
tive line drops at high currents.
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 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.
PRODUCT OVERVIEW
SWITCH
CONTROL
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE
ERROR AMP
+Vin
(1)
-Vin
(3)
Vout
TRIM
(6)
-SENSE
(5)
-Vout
(4)
+Vout
(8)
REMOTE
ON/OFF
CONTROL
(2)
INPUT
UNDER VOLTAGE,
OVER TEMPERATURE,
AND OUTPUT
OVER VOLTAGE
COMPARATORS
PULSE
TRANSFORMER
+SENSE
(7)
Typical topology is shown
Typical unit
Figure 1. Simplified Block Diagram
REG.-Nr. D216