FEATURES

•

-55°C to +125°C operation

•

19 to 56 VDC input

•

80 V for 100 ms transient protection

•

Dual Magnetic feedback

• Topology – Two-Phase Flyback

•

Inhibit function and output trim

•

Indefinite short circuit protection

•

Radiation tolerant to

•

Meets MIL-STD-704A emergency operation and tran-

sient standards

•

No minimum load required

•

5 port isolated design

•

Isolated synchronization input

•

Output trimmable up to +25% and -45% (see trim

instructions)

DESCRIPTION

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

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

SMRT converters are manufactured in Interpoint’s fully certified

and qualified MIL-STD-1772 production facility and packaged

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 SMRT 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 SMRT’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 100k rads(Si) or greater to

ensure tight regulation over the full input range.

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. Sets are defined as follows:

Two paralleled power trains supplying a single output; one

independent power train providing a single output; and one

independent power train providing two outputs (neg. output is

cross-regulated). This product configuration eliminates cross

regulation effects between output sets.

Configurations include:

• Single Output: One two-phased single output

• Dual Output: Two single phase single outputs

• Triple Output: One single phase independent Main output and one

single phase dual output. (± Auxiliary output).

The converters have an undervoltage lockout that will allow

power conversion at 17 volts on a rising input voltage and a

conversion shut-down on a falling voltage at approximately 14.5

volts.

MODELS

SINGLE

3.3

5

12

15

DUAL

±5

±12

±15

TRIPLE

+3.3 & ±12

+3.3 & ±15

+5 & ±12

+5 & ±15

Crane Aerospace & Electronics Power Solutions

SMRT Single, Dual and Triple DC/DC Converters

Crane Aerospace & Electronics

Electronics Group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • electronics@craneae.com

www.craneae.com

Page 1 of 17

Rev B – 20080213

28 VOLT INPUT – 35 WATT