MODELS

SINGLE

5

12

15

28

DUAL

±5

±12

±15

DESCRIPTION

The MHP270 Series™ DC/DC converters provide up to 65 watts of

output power over the full –55°C to 100°C temperature range.

MHP270 models operate from a MIL-STD-704 nominal 270 volt DC

power bus – from 160 to 400 VDC continuous operation with surges

to 450 volts – and provide isolated outputs at 5, 12, 15, and 28 VDC.

Parallel operation for all loading conditions is supported without any

requirement for external components.

MHP270 DC/DC converters are constant frequency, pulse width

modulated switching power supplies which use a quasi-square

wave, two-switch single-ended forward converter design. Tight load

regulation is achieved through a wide-bandwidth magnetic feedback

circuit.

Up to five single output MHP converters may be used in parallel to

power a single load by simply connecting the share pins of all units.

Units in this configuration have a 85% current sharing accuracy over

all loading conditions.

MHP Series of converters feature a flexible synchronization scheme

in which units may be synchronized to an external clock or to one

another by using sync in and sync out pins provided on each unit.

MHP converters have a nominal switching frequency of 600 kHz, but

may be synchronized at any frequency from 525 to 675 kHz.

MHP converters meet a wide variety of military/aerospace perform-

ance and environmental specifications. Their continuous operation

input voltage (160 to 400) meets the normal operating limits of MIL-

STD-704. The unit shuts down above approximately 425 volts, but

it is rated to withstand a surge of up to 450 volts for 50 msec. The

units are built as fully hermetic thick film hybrids in Interpoint’s MIL-

STD-1772 certified facilities.

The MHP270 Series offer a complete list of standard features which

include:

Undervoltage lock-out – shuts down when the input line voltage falls

below approximately 120 VDC to provide smooth initialization.

Continuous short circuit protection – current limit set at approxi-

mately 125%.

Soft-start – controlled start-up at turn-on, release from inhibit, and

recovery from load fault conditions.

Remote sense – to provide automatic compensation for voltage

drops on output lines on single output models.

MHP270 SERIES

65 WATT

• –55° to +100°C operation

• 160 to 400 VDC input

• Fully isolated

• Magnetic feedback

• Fixed frequency, 600 kHz typical

• Topology –

Two Switch, Single Ended Forward

• 450 V / 50 ms transient protection

• Inhibit input side and output side

• Sync in and out

• Indefinite short circuit protection

• Remote sense on single models

• Up to 85% efficiency

• Parallelable: up to 5 converters

Size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)

See “Case U Maximum Dimensions” and “Case U.”

Weight:

86 grams maximum

Screening: MHP270 Standard or MHP270 ES.

See “QA Screening: MHP270” for more information

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