description

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

watts of output power over -55°C to +100°C temperature range.

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

DC power bus with 160 to 400 VDC continuous operation with

surges to 450 volts. Isolated outputs include 5, 12, 15, and 28

VDC singles and ±5, ±12 and ±15 VDC duals. Parallel operation

for all loading conditions is supported without any requirement for

external components. The converters are available with standard

screening or “ES” screening

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 MHP270 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 an 85% current

sharing accuracy over 35% load to full load conditions.

MHP270 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. MHP270 converters have a nominal switching

frequency of 525 kHz, but may be synchronized at any frequency

from 475 to 575 kHz.

MHP270 converters meet a wide variety of military/aerospace

performance 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 milliseconds. The units are built as fully hermetic thick film

hybrids in our MIL-PRF-38534 certified facilities.

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

falls below approximately 120 VDC to provide smooth initializa-

tion.

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 – Sense lines increase the output voltage to

compensate for IR drops in traces and wires. The voltage

compensation can be up to a maximum of 10% of nominal output

voltage to maintain tightly regulated voltage at the load.

The MHP270 Series converters are capable of providing other

output voltage options in addition to those characterized on this

datasheet. Contact your sales representative to discuss other

output voltage options, www.craneae.com/interpoint/contacts.

Interpoint converters may use one or more of the following US

patents 5,521,807, 5,694,303, and 5,631,822.

MODELS

single

5

12

15

28

Dual

±5

±12

±15

Features

parallel operation with current share,

up to 5 units (up to 276 watts)

Operating range -55° to +100°C

•

Input voltage 160 to 400 VDC

•

Transient protection 450 V for 50 ms

•

Fully isolated, magnetic feedback

•

Fixed high frequency switching

•

Remote sense on single models

•

Inhibit primary side and secondary side

•

Sync In and Sync Out

•

Indefinite short circuit protection

•

High power density, up to 85% efficiency

•

Crane Aerospace & Electronics Power Solutions

MHp270 single and dual dc/dc converters

Crane Aerospace & Electronics

Power Solutions - Interpoint Products

10301 Willows Road NE, Redmond, WA 98052

+1.425.882.3100•power@crane-eg.com

www.craneae.com/interpoint

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270 Volt input – 65 Watt

MHP270 Rev H - 2011.08.04