Crane Aerospace & Electronics Power Solutions
sMrt28 singlꢂ, Dꢀꢄl ꢄnd tꢃiplꢂ spꢄꢇꢂ Dc/Dc convꢂꢃꢁꢂꢃꢈ
28 VOLt Iꢆꢅut – 35 Watt – sꢅace quaLIFIeD
Features
Bꢀilꢁ in MIL-stD-461 eMI filꢁꢂꢃ
Oꢀꢁpꢀꢁ ꢁꢃim fꢃom 51% ꢁo 124% of nominꢄl
•ꢀ 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
MODELS
VDC Ou t p u t
•ꢀ Indefinite short circuit protection
•ꢀ Radiation tolerant to
SIꢀꢁLE
3.3
5
DUAL
±5
±12
±15
- 1 x 1012 protons/cm2 neutron or proton fluence
- 1011 rad(Si)/sec dose rate
8.7
12
15
- 3 x 105 rad(Si) total dose
- SEE - LET to 80 MeV cm2/mg
TRIPLE
+3.3 & ±12
+3.3 & ±15
+5 & ±7
•ꢀ Meets MIL-STD-704A transient standards
+5 & ±12
+5 & ±15
DescrIꢅtIOꢆ
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-
ated below 19 Vin above 5x104 rad(Si) total dose.
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.
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.
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.
Configurations:
•ꢀSingleꢀOutput:ꢀOneꢀtwo-phaseꢀsingleꢀoutput
•ꢀDualꢀOutput:ꢀTwoꢀsingle-phaseꢀsingleꢀoutputs
•ꢀTripleꢀOutput:ꢀOneꢀsingle-phaseꢀindependentꢀ
Main output and one single-phase dual output.
(± Auxiliary output)
Crane Aerospace & Electronics
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Electronics ꢁroup (Interpoint Brand)
POꢀBoxꢀ97005ꢀꢀ•ꢀꢀRedmondꢀWAꢀ98073-9705
425.882.3100ꢀꢀꢀ•ꢀꢀꢀpower@crane-eg.com
www.interpoint.com
SMRT28 Rev E - 20100216
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 [ Crane Aerospace & Electronics. ]
