Datasheet

ULS 100-Watt Series
Sixteenth-brick DOSA-Compatible,
Isolated DC-DC Converters
MDC_ULS-100 Series.A09 Page 1 of 28
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FEATURES

Industry standard DOSA "Sixteenth-brick"
format and pinout with surface mount option

36-75 Volts DC input range, 3.3, 5 and 12 Vdc
outputs.

2250 Volt Basic input/output isolation

Up to 100 Watts total output power

High effi ciency synchronous rectifi er topology

Stable no-load operation with no required
external components

Operating temperature range -40 to +85°C
with derating

Certifi ed to UL 60950-1, CSA-C22.2 No. 234,
EN60950-1 safety approvals, 2nd Edition

Extensive self-protection features
The new ULS 100 Watts series offers output
voltages of 3.3Vout (30A), 5Vout (20A) and 12Vout
(8.3A). The ULS sixteenth-brick series maintains
a width of 0.9 inches while still retaining up to
100 Watt output and full 2250 Volt DC isolation.
The PC-board mount converter family accepts
36to 75 Volts DC inputs and delivers fi xed 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
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 remote
On/Off control may use a switch, transistor or
digital logic. Remote Sense inputs compensate for
resistive 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 output current
limit uses the “hiccup” autorestart technique (i.e.,
the outputs may be short-circuited indefi nitely).
Additional features include output overvoltage and
reverse conduction elimination.
The synchronous rectifi er topology yields high
effi ciency for minimal heat buildup and “no fan”
operation.
PRODUCT OVERVIEW
Typical topology is shown
Typical units
Figure 1. Simplifi ed Block Diagram
REG.-Nr. D216
F1
External
DC
Power
Source
Reference and
Error Amplifier
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
-Vout (4)
+Vout (8)
Trim (6)
On/Off
Control
(2)
-Vin (3)
Open = On
$MPTFE0GG
+Vin (1)
1PTJUJWF
MPHJD
Controller
and Power
5SBOTGFS
*TPMBUJPO
Barrier
4FOTF
4FOTF
C
T
OV
ER
VI
EW
Ty