SMRT28515THP datasheet(2/17 Pages) CRANE

2 / 17 page

INHIBIT FUNCTION

The SMRT Series incorporates an inhibit terminal that can be

used to disable internal switching. The converter is inhibited

when a low (≤ 0.4 V) signal is applied to the inhibit pin. In the

inhibit mode the inhibit pin current requirement is less than ~2

mA. The converter resumes normal operation when a high (≥ 2.4

V) signal or open circuit is applied to the inhibit pin. The open

circuit voltage of the inhibit is 5 to 6 volts.The maximum allowable

voltage applied to the inhibit pin is 10 VDC.

SYNCHRONIZATION

An isolated sync input allows this input to be connected to any of

the devices three returns. It can be referenced to the input return

or any of the output returns. Input current into this pin is limited

by a series 1k ohm resistance.

OUTPUT VOLTAGE TRIM

The output voltage of each set can be trimmed up by up to 25%,

or down by up to 45% of nominal (varies by model, see trim

instructions). The following are “sets” of voltages in relation to

trim:

• Triple output models: Main output is one set, the dual outputs are

another set.

• Dual outputs: Each output is a “set.”

One set can be trimmed using the trim pin, the other set can be

trimmed (up only) using the sense pin.

• Single: One set

RADIATION HARDENED

The SMRT DC/DC converters are designed to provide continuous

normal operation through radiation levels associated with space

missions and in tactical and strategic military environments. The

converters will operate normally in radiation environments with up

to 1 x 1012 neutrons per square centimeter neutron fluence,

1011 rads(Si) per second dose rate, and 3x105 rads(Si) total

dose. These levels of radiation tolerance make the SMRT

converters suitable for electronics in programs where operation in

high radiation environments is required.

At the highest dose rate (1011 rads(Si)/sec dose rate) there

will be an upset resulting in a dip in the voltage. This is non-

destructive to the unit. The converter will operate through the

upset.

SCREENING

SMRT converters offer the following screening options: Space

Prototype (O), Class H, or Class K. Radiation tolerant to

Radiation Hardness Assurance (RHA) levels of “-” (O), “P”, “R” or

“F”, per MIL-PRF-38534. Interpoint model numbers use an “O” in

the RHA designator position to indicate the “-” (dash) Radiation

Hardness Assurance level of MIL-PRF-38534, which is defined

as “no RHA”. See “Class H and K, MIL-PRF-38534 Screening”

tables for more information.

EMI

The SMRT has a built-in EMI input filter which brings the

conducted emissions into compliance with both methods of

MIL-STD-461, revisions C-CE03 and D-/E-CE102.

SENSE

Tight load regulation is maintained via wide bandwidth magnetic

feedback and through the use of remote sense on single output

models and one output (Output “A”) of the dual units. The sense

feature can be used to adjust the output voltage by connecting a

resistor between the sense line and the positive output.

SENSE ADJUST INSTRUCTIONS (UP ONLY)

- DUAL UNITS OUTPUT A ONLY

(See trim tables on page 4)

5V Dual Sense Adjust: Max. 5.40 V

EXTERNAL = 30 (

Vdesired - 5

)

0.675 - 0.125 Vdesired

12V Dual Sense Adjust: Max. 12.48 V

EXTERNAL = 600 (

5 x Vdesired - 60.42

)

156 - 12.5Vdesired

15V Dual Sense Adjust: Max 15.36 V

EXTERNAL = 600 (

Vdesired - 15

)

38.4 - 2.5Vdesired

Crane Aerospace & Electronics Power Solutions

www.craneae.com

Page 2 of 17

Rev B – 20080213

SMRT Single, Dual and Triple DC/DC Converters

28 VOLT INPUT – 35 WATT

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