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MTO Rev C 20100212

Crane Aerospace & Electronics

Electronics Group (Interpoint Brand)

PO Box 97005 • Redmond WA 98073-9705

425.882.3100 • power@crane-eg.com

www.interpoint.com

Features

• –55°C to +85° C operation

• 16 to 36 VDC input

• 50 V for 50 ms transient protection

• Fully isolated

• Fixed frequency switching

• Inhibit function

• Indefinite short circuit protection

• Up to 79% efficiency

mODels

triple

+5 & ±12

+5 & ±15

Description

Interpoint’s mTO series™ of DC/DC converters delivers 15 watts of output

power with three output voltages and a choice of two input voltage ranges.

The mTO series converters are packaged in hermetically sealed metal

cases and operate at full load over a case temperature range of -55°C to

+85°C (measured at the base plate of the converter).

The push-pull forward topology coupled with pulse-width modulation

minimizes output noise and maintains good regulation. Nominal switching

frequency is 250 kHz. Although an internal input filter reduces input ripple

current, for applications requiring conformance to mIl-sTD-461C, Ce03,

use the mTO in conjunction with Interpoint’s Fm-461 emI filter.

Operating at maximum ratings may require removing self-generated heat.

To increase heat dissipation, heat conducting material can be used in

contact with the converter’s base plate. Interpoint’s Thermal mounting Pad

(TmP), model TmP-002, is designed for use with the mTO converter.

An inhibit terminal, pin 8, provides shut-down and start-up control. Applying

a logic low (<0.8 V) will disable the output of the converter reducing input

current to 8 mA, typical. leaving the terminal unconnected or connecting it

to Vin will enable the converter. The inhibit pin has an open circuit voltage

of approximately 10 volts.

soft-start provides a controlled 20 milliseconds turn-on to minimize inrush

current and reduce overshoot at initial start-up or when inhibit is released.

Internal current limiting circuitry protects all three outputs against short

circuits. When output power exceeds approximately 125% of maximum

output power, the output currents are limited. In addition, separate current

limiting circuitry protects each output individually.

mTOconvertersarepackagedinhermeticallysealedmetalcases.Thecases

are constructed of cold-

rolled steel with a fused tin

finish. mTO converters can

be purchased in a flanged

or non-flanged case. The

flanged option provides

increased heat dissipation

and also provides greater

stability when mechanically

secured.

size (max.): Non-flanged, case F4, 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm)

Flanged, case J5, 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)

see cases F4 and J5 for dimensions.

Weight:

53 grams typical

screening: standard or es. see screening table for more information.

7

Short Circuit Amp

Linear

Regulator

Linear

Regulator

Pass Transistor

Pass Transistor

Pulse

Width

Modulator

Pre-

Regulator

Case Ground

Error

Amp

8

Inhibit

1

Positive

Input

10

Input

Common

2

3

5

4

Output

Common

Positive

Auxiliary

Output

Negative

Auxiliary

Output

mTO seRIes

15 WATT

not reCoMMenDeD For neW DesIGns