F
EATURES
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–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
DC/DC C
ONVERTERS
270 V
OLT
I
NPUT
MHP270 SERIES
65 WATT
MODELS
VDC O
UTPUT
SINGLE
5
12
15
28
DUAL
±5
±12
±15
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
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.
1
MHP270 SERIES
65 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 160 to 400 VDC
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
DC/DC C
ONVERTERS
SYNC AND INHIBIT (INH1, INH2)
Sync In (525 to 675 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min
• If not used, connect to input common
• Referenced to input common
Sync Out - Referenced to input common
Inhibit (INH1, INH2) TTL Open Collector
• Logic low (output disabled)
INH1 referenced to input common
Logic low 0.8 V max
INH2 referenced to output common
Logic low 0.5 V max
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Isolation
• 100 megohm minimum at 500 V
Conversion Frequency
• Free run mode 600 kHz typical
525 kHz. min., 675 kHz max
• External sync range: 525 to 675 kHz
Inhibit Pin Voltage (unit enabled)
• INH1 =12 V typ., INH2 = 5 V typ
Low Line Drop Out - Vout drops 50 mv
• Input voltage 155 VDC max
Undervoltage Lockout
• Input voltage 110 VDC min
Current Limit
• 125% of full load typical
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 160 to 400 VDC continuous
• 450 VDC for 50 msec transient
Case Operating Temperature (Tc)
• –55 to +100°C full power
PINS NOT IN USE
Inhibit (INH1, INH2)
Sync Out
Sync In
Share
Sense Lines
No connection
No connection
Connect to input common
Connect to output common
Must be connected to
appropriate outputs
Electrical Characteristics: 25°C Tc, 270 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
LOAD REGULATION
INPUT VOLTAGE
INPUT CURRENT
10 kHz - 2 MHz
V
IN
= 160 TO 400 VDC
NO LOAD TO FULL
CONTINUOUS
TRANSIENT
1
50 ms
NO LOAD
INHIBITED - INH1
INHIBITED - INH2
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
2
10 kHz - 10 MHz
POWER DISSIPATION
SHORT CIRCUIT
V
OUT
STEP LOAD RESP.
50% – 100% – 50%
TRANSIENT
RECOVERY
3
—
—
—
—
300
300
—
—
—
—
700
500
—
—
—
—
700
300
—
—
—
—
1800
1000
mV pk
µs
—
—
—
160
—
—
—
—
—
76
—
—
—
—
—
270
—
—
—
—
—
—
—
—
50
50
50
400
450
20
8
15
50
—
19
1.5
—
—
—
160
—
—
—
—
—
81
—
—
—
—
—
270
—
—
—
—
—
—
—
—
50
120
120
400
450
20
10
15
50
—
19
1.5
—
—
—
160
—
—
—
—
—
80
—
—
—
—
—
270
—
—
—
—
—
—
—
—
75
150
150
400
450
20
7
15
45
—
19
1.0
—
—
—
160
—
—
—
—
—
80
—
—
—
—
—
270
—
—
—
—
—
—
—
—
280
280
280
400
450
20
10
15
50
—
23
1.0
mV p-p
mV
mV
VDC
V
mA
mA
CONDITION
V
IN
= 160 TO 400 VDC
V
IN
= 160 TO 400 VDC
MHP27005S
MIN
4.95
0
0
TYP MAX
5.00 5.05
—
—
10
50
MHP27012S
MIN TYP MAX
11.88 12.00 12.12
0
0
—
—
5
60
MHP27015S
MIN TYP MAX
14.85 15.00 15.15
0
0
—
—
4.33
65
MHP27028S
MIN TYP MAX
27.22 28.00 28.28
0
0
—
—
2.32
65
UNITS
VDC
A
W
mA p-p
%
W
VDC
Notes
1. Unit will shut down above approximately 425V but will be undamaged
and will restart when voltage drops into normal range.
2. Indefinite short circuit protection not guaranteed above 100°C case.
3. Recovery time is measured from application of the transient to point at
which Vout is within 1% of final value.
2
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
1
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
2
OUTPUT POWER
2
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
LOAD REGULATION
3
CROSS REGULATION
4
INPUT VOLTAGE
INPUT CURRENT
CONDITIONS
+V
OUT
–V
OUT
MHP27005D
MIN TYP MAX
4.95 5.00 5.05
4.95 5.00 5.05
0
0
—
—
±5
—
50
—
8.0
50
100
100
MHP27012D
MIN TYP MAX
11.88 12.00 12.12
11.88 12.00 12.12
0
0
—
—
±2.5
—
50
—
4.0
60
125
120
MHP270 SERIES
65 WATT
MHP27015D
MIN TYP MAX
14.85 15.00 15.15
14.85 15.00 15.15
0
0
—
—
±2.16
—
50
—
3.46
65
125
150
UNITS
VDC
A
W
mV p-p
mV
Electrical Characteristics: 25°C Tc, 270 VDC Vin, 100% load, free run, unless otherwise specified.
V
IN
= 160 TO 400 VDC
V
IN
= 160 TO 400 VDC
10 kHz - 2 MHz
± V
OUT
V
IN
= 160 TO 400 VDC
± V
OUT
NO LOAD TO FULL
± V
OUT
EFFECT ON –V
OUT
CONTINUOUS
TRANSIENT
5
50 ms
NO LOAD
INHIBITED - INH1
INHIBITED - INH2
10 kHz - 10 MHz
BALANCED LOAD
POWER DISSIPATION
SHORT CIRCUIT
V
OUT
50 %–100% LOAD
7
TRANSIENT
RECOVERY
8
—
—
160
0
—
—
—
—
74
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
100
1000
400
450
20
10
15
45
—
8
±2.0
300
500
—
—
160
0
—
—
—
—
81
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
120
800
400
450
20
10
15
45
—
7.5
±1.0
900
500
—
—
160
0
—
—
—
—
82
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
150
750
400
450
20
8
15
45
—
19
±1.5
900
500
mV
mV
VDC
V
mA
mA
mA p-p
%
W
V
mV pk
µs
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
6
STEP LOAD
RESPONSE ± V
OUT
Notes
1. Share operation not characterized for dual outputs.
2. Up to 80% of the total output power (current) is available from either output
providing the opposite output is carrying 20% of the power (current) in use.
3. Assumes balanced loads on the outputs.
4. Effect on the negative output from 50%/50% loads to 70%/30% or 70%/30%
loads.
5. Unit will shut down above approximately 425V but will be undamaged
and will restart when voltage drops into normal range.
6. Indefinite short circuit protection not guaranteed above 125°C case.
7. Second output at 50%
8. Recovery time is measured from application of the transient to point at
which Vout is within 1% of final value.
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
Inhibit
Sync In
–
+
RL
REMOTE SENSE CONNECTION
F
IGURE
1: S
ENSE
C
ONNECTIONS
3
MHP270 SERIES
65 WATT
+
270V
–
1
2
3
4
5
6
Positive Input
Input Common
INH2
INH1
DC/DC C
ONVERTERS
Share 12
N/C 11
Pos. Sense 10
Sense Return 9
8
7
+
SINGLE OUTPUT MODELS CONNECTION DIAGRAM - PARALLEL
MHP270 #1
Sync Out
Sync In
Output Common
Positive Output
MODEL NUMBERING KEY
RL
–
1
2
3
4
5
6
Positive Input
Input Common
INH2
INH1
Share 12
N/C 11
Pos. Sense 10
Sense Return 9
Output Common
Positive Output
8
7
MHP
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
270 05 S / ES
MHP270 #2
Sync Out
Sync In
Screening
(Standard screening has no designator
in this position.)
1 Positive Input
2 Input Common
3 INH2
4
MHP270
INH1
5
Sync Out
6
Sync In
Share 12
N/C 11
#N
Pos. Sense 10
9
Sense Return
8
Output Common
7
Positive Output
F
IGURE
2: P
ARALLEL
C
ONNECTIONS
PIN OUT
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Single Output
Positive Input
Input Common
Inhibit 2 (INH2)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Sense Return
Positive Sense
No connection
Share
Dual Output
Positive Input
Input Common
Inhibit 2 (INH2)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Negative Output
No connection
No connection
Share
Angled corner indicates pin one.
1
2
3
4
5
6
12
11
TOP VIEW
MHP
(Pin side, marked side)
See “Case U Maximum Dimensions”
and “Case U”
10
9
8
7
F
IGURE
3: P
IN
O
UT
4
MHP270 Rev D This revision supercedes all previous releases.
All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. MHP270 Series is a trademark of
Interpoint. Copyright © 1994 - 2005 Interpoint Corporation. All rights reserved.
CASES
CASE U MAXIMUM DIMENSIONS
TOP VIEW (PIN SIDE)
Angled corner indicates pin one
1.505 max (38.23)
See Case U for pin configuration
3.005 (76.33) max.
Note:
Pins are shown for Case U1.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins
#52 alloy/Gold
compression glass seal
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.2) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device.
Solder pins individually with heat application not exceeding 300°C for 10 seconds per pin
Case U maximum dimensions, Rev B, September 27 2005
Please refer to the numerical dimensions for accuracy. All information is believed to be accurate,
but no responsibility is assumed for errors or omissions. Interpoint reserves the right to make
changes in products or specifications without notice.
Copyright © 1999-2005 Interpoint Corp. All rights reserved.
5
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