MTO1212T Datasheet, PDF (1/9 Pages) Interpoint Corporation Company – DC/DC CONVERTERS 12 & 28 VOLT INPUT

FEATURES
• –55°C to +85° C operation
• 9 to 16 or 16 to 36 VDC input
• Fully isolated
• Opto-coupler feedback
• Fixed frequency, 250 kHz typical
• Topology – Push-Pull Forward
• 50 V for 50 ms transient protection
• Inhibit function
• Indefinite short circuit protection
• Up to 79% efficiency
DC/DC CONVERTERS
12 & 28 VOLT INPUT
MTO SERIES
15 WATT
MODELS
VDC OUTPUT
TRIPLE
+5 & ±12
+5 & ±15
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
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.
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.
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