Datasheet

Figure 1. Simplifi ed Block Diagram
+V
OUT
+V
IN
–V
IN
PWM
CONTROLLER
OPTO
ISOLATION
REFERENCE &
ERROR AMP
COMMON
FEATURES

Lowest cost! Highest reliability!

100% SMT-on-pcb, including magnetics

100% automatically assembled

Standard "DIP" package and pinouts

Fully isolated, 1000Vdc guaranteed

5, 12 or 15 Volt outputs

Choice of 3 wide-range inputs:
4.5-9 Volts
9-18 Volts
18-72 Volts

Guaranteed effi ciencies to 73%

–40 to +75°C full-power operation

Internal input/output fi ltering

UL1950/C22.2 No. 950/IEC950 certifi ed

Modifi cations and customs for OEM’s
Rarely has a Series of low-power DC/DC
converters been defi ned by both low cost and
Murata Power Solutions' made-in-the-USA quality
and reliability. Our new UST Series of single-output
DC/DC’s achieves this best-of-both-worlds status
by implementing a proven circuit architecture
(170-200kHz fl yback design) as a full, SMT-on-pcb
assembly (including surface-mount magnetics) that
is truly 100% automatically assembled. Packaged
in miniature 1.25" x 0.8", DIP-like plastic packages
(UL94V-0 rated) and requiring no external compo-
nents, UST Series DC/DC’s bring true component-
like convenience to designers of today’s distributed
power systems.
Output voltages are 5, 12 or 15 Volts. Input
voltage ranges are 4.5-9V ("D5" models), 9-18V
("D12" models) or an ultra-wide 18-72V ("D48"
models). UST DC/DC’s are fully isolated (1000Vdc
guaranteed) and include input (pi type) and output
fi lters within their package. Output transient
response is a quick 200µsec, while output ripple
and noise are typically 75mVp-p.
These rugged modules are fully encapsulated
with a thermally conductive potting compound that
contributes to their outstanding moisture/vibration
resistance and impressive MTBF. They operate over
the full –40 to +75°C temperature range without
derating. All models have been thoroughly charac-
terized (electrically, mechanically and thermally),
qualifi ed (including HALT), and EMI/EMC tested.
Additionally, they are certifi ed to UL1950, CSA 22.2
No. 950 and IEC950.
Murata Power Solutions' UST Model 3W DC/
DC’s are excellent selections for telecom/datacom,
computer and process-control applications demand-
ing small size, low cost and high reliability. If required,
their design "fl exibility" allows for easy modifi cation to
your application-specifi c requirements.
PRODUCT OVERVIEW
www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
UST Models
3W, Single Output DC/DC Converters
MDC_UST_3W.E01 Page 1 of 4