Features

Built in MIL-stD-461 eMI filter

Output trim from 51% to 124% of nominal

Operating temperature -55° to +125°C

•

Qualified to MIL-PRF-38534 Class H and K

•

Radiation hardness assurance (RHA) to

•

level F 300 kRad(Si)

Input voltage range 19 to 56 VDC

•

Transient protection 80 V for 100 ms

•

Fully isolated, 5 port isolation

•

Dual magnetic feedback

•

Fixed high frequency switching

•

Remote sense

•

Inhibit function

•

Synchronization input

•

Indefinite short circuit protection

•

Radiation tolerant to

•

1 x 10

-

10

3 x 10

-

SEE - LET to 80 MeV cm

-

Meets MIL-STD-704A transient standards

•

DescrIptIOn

The SMRT28 Series™ of DC/DC converters offers up to 35

watts of power in a radiation tolerant design. The low profile

SMRT28 converters are manufactured in Interpoint’s fully certi-

fied and qualified MIL-PRF-38534 production facility and pack-

aged in hermetically sealed steel cases. They are ideal for use in

programs requiring high reliability, small size, and high levels of

radiation hardening assurance.

The SMRT28 converters are switching regulators which use a

two-phase, phase shifted flyback design with a nominal switching

frequency of 300 kHz. Close regulation is maintained with

advanced constant frequency pulse width modulation design

techniques. The SMRT28’s feed-forward compensation and

discontinuous topologies provide high levels (80 dB peak) of

input-to-output ripple rejection.

A minimum load of 2% of full load should be used on outputs at

TID of 100 kRad(Si) or greater to ensure tight regulation over the

full input range. The converter should not be inhibited or oper-

Two independent feedback loops are used to regulate the dual

and triple outputs, one feedback loop regulates the two-phased

single output. Each set of outputs is electrically isolated from the

other and from the input. This product configuration eliminates

cross regulation effects between output sets.

Configurations:

•SingleOutput:Onetwo-phasesingleoutput

•DualOutput:Twosingle-phasesingleoutputs

•TripleOutput:Onesingle-phaseindependent

Main output and one single-phase dual output.

(± Auxiliary output)

MODELS

SIngLE

3.3

5

8.7

12

15

DUAL

±5

±12

±15

TRIPLE

+3.3 & ±12

+3.3 & ±15

+5 & ±7

+5 & ±12

+5 & ±15

The information in this document is a derivative of a document cleared

by the Department of Defense (DoD) Office of Security Review (OSR) for

public release. OSR case number 09-S-1960 dated June 22, 2009.

Crane Aerospace & Electronics Power Solutions

sMrt28 single, Dual and triple space Dc/Dc converters

Crane Aerospace & Electronics

Electronics group (Interpoint Brand)

POBox97005•RedmondWA98073-9705

425.882.3100•power@crane-eg.com

www.interpoint.com

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28 VOLt Input – 35 Watt – space quaLIFIeD

SMRT28 Rev E - 20100216