MHP27005S Datasheet, PDF (1/10 Pages) Interpoint Corporation Company – DC/DC CONVERTERS 270 VOLT INPUT

Crane Aerospace & Electronics Power Solutions
MHP270 Single and Dual DC/DC Converters
270 Volt input – 65 Watt
Features
Parallel operation with current share,
up to 5 units (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
models
VDC Output
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.
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.
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 msec. The units are built as fully hermetic thick film hybrids
in our MIL-PRF-38534 ­certified facilities.
Features
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%.
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.
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.
VDC
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005•Redmond WA 98073-9705
425.882.3100 • [e-mail]
www.interpoint.com
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Rev F - 20090304