FEATURES
MTO SERIES
15 WATT
DC/DC CONVERTERS
12 & 28 VOLT NPUT
• –55°C to +85° C operation
• 9 to 16 or 16 to 36 VDC input
• Fully isolated
I
• Opto-coupler feedback
• Fixed frequency, 250 kHz typical
• Topology – Push-Pull Forward
• 50 V for 50 ms transient protection
• Inhibit function
MODELS
VDC OUTPUT
TRIPLE
+5 & ±12
+5 & ±15
• Indefinite short circuit protection
• Up to 79% efficiency
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 Section B8, cases F4 and J5, for dimensions.
Weight:
53 grams typical
Screening: Standard or ES. See Section C2 for screening options, see Section A5 for
ordering information.
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).
FEATURES
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 uncon-
nected or connecting it to Vin will enable the converter. The inhibit
pin has an open circuit voltage of approximately 10 volts.
CONVERTER DESIGN
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.
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.
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.
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.
PACKAGING
MTO converters are packaged in hermetically sealed metal cases.
The cases 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.
B4-23
CRANE [ Crane Aerospace & Electronics. ]
