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
• Sync In and Sync out
• Inhibit primary side and secondary side
VDC O
utput
single
MoDELS
• Indefinite short circuit protection
• High power density, up to 85% efficiency
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.
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 msec. The units are built as fully hermetic thick film hybrids
in our MIL-PRF-38534 certified facilities.
F
eatures
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 – 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 • power@crane-eg.com
www.interpoint.com
Rev F - 20090304
Page 1 of 10
Crane Aerospace & Electronics Power Solutions
MHp270 single and dual dc/dc converters
270 Volt input – 65 Watt
Operating COnditiOns and CharaCteristiCs
input Voltage range
• 160 to 400 VDC continuous
• 450 VDC for 50 msec transient
synC and inhibit
sync
• Sync In
‣
Input frequency 475 to 575 kHz.
‣
Duty cycle 40% min, 60% max
‣
Active low 0.8 V max
‣
Active high 4.5 V min, 10 V max
‣
Referenced to input common
• Sync out
‣
Referenced to input common
output power
• 50 to 65 watts depending on model
lead soldering temperature (10 sec)
• 300°C
storage temperature range (case)
• -65°C to +150°C
current limit
• 125% of full load typical
output Voltage temperature coefficient
• 100 ppm/°C typical
case operating temperature (tc)
• -55 to +100°C full power
isolation
• 100 megohm minimum at 500 V
conversion Frequency
• Free run mode 525 kHz typical
‣
475 kHz. min., 575 kHz max
• External sync range: 475 to 575 kHz
low line drop out
• Vout drops 1% of nominal
• Input voltage 155 VDC max
inhibit (inH1, inH2)
• Active low (output disabled)
‣
INH1 referenced to input common
Active low 0.8 V max
Inhibit pin will source 15 mA max
‣
INH2 referenced to output common
Active low 0.5 V max
Inhibit pin will source 15 mA max
• Active high (output enabled)
‣
open collector
‣
open pin voltage: INH1 = 12V typ, INH2 = 5 V typ
meChaniCal and envirOnmental
size (maximum)
• 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
• See case U for dimensions.
Weight (maximum)
• 86 grams max
undervoltage lockout
• Input voltage 110 VDC min
screening
• Standard or ES. See “MHP270 (Standard and /ES, non-QML
Products” screening table for more information, page 10.
SINGLE oUTPUT MoDELS CoNNECTIoN DIAGRAM - SENSE
270 V
+
–
1
2
3
4
5
6
Positive Input
Input Common
INH2
INH1
Sync Out
Sync In
Share 12
N/C 11
Pos. Sense 10
9
Sense Return
8
Output Common
7
Positive Output
–
+
RL
Inhibit
Sync In
REMOTE SENSE CONNECTION
F
igure
1: s
ense
C
OnneCtiOns
www.interpoint.com
Rev F - 20090304
Page 2 of 10
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