F
EATURES
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–55° to +125°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 Figures 5 and 6 for dimensions.
Weight:
86 grams maximum
Screening: Standard or ES. See Table 1 for more information
DESCRIPTION
The MHP270 Series™ DC/DC converters provide up to 65 watts of
output power over the full –55°C to 125°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
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 160 to 400 VDC continuous
• 450 VDC for 50 msec transient
Case Operating Temperature (Tc)
• –55 to +125°C full power
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
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
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
—
—
—
—
—
77
—
—
—
—
—
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
—
—
—
—
—
82
—
—
—
—
—
270
—
—
—
—
—
—
—
—
75
150
150
400
450
20
7
15
45
—
9
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
—
5
0
—
60
MHP27015S
MIN TYP MAX
14.85 15.00 15.15
0
— 4.33
0
—
65
MHP27028S
MIN TYP MAX
27.22 28.00 28.28
0
— 2.32
0
—
65
UNITS
VDC
A
W
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
2
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 125°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
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
1
OUTPUT POWER
OUTPUT RIPPLE
VOLTAGE
LINE REGULATION
LOAD REGULATION
2, 3
CROSS REGULATION
4
INPUT VOLTAGE
INPUT CURRENT
CONDITIONS
+V
OUT
–V
OUT
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
FULL LOAD
INHIBITED - INH1
INHIBITED - INH2
10 kHz - 10 MHz
BALANCED LOAD
POWER DISSIPATION
SHORT CIRCUIT
V
OUT
50 %–100% LOAD
7
TRANSIENT
RECOVERY
—
—
160
0
—
—
—
—
—
74
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
—
100
1000
400
450
20
2.5
10
15
45
—
8
±2.0
300
500
—
—
160
0
—
—
—
—
—
81
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
—
120
800
400
450
20
2.80
10
15
45
—
7.5
±1.0
900
500
—
—
160
0
—
—
—
—
—
82
—
—
—
—
—
—
270
—
—
—
—
—
—
—
—
—
—
—
—
—
100
—
—
120
—
—
—
50
100
—
50
125
—
50
MHP27005D
MIN TYP MAX
4.95 5.00 5.05
4.95 5.00 5.05
0
0
±5
—
8.0
50
MHP27012D
MIN TYP MAX
11.88 12.00 12.12
11.88 12.00 12.12
0
0
±2.5
—
4.0
60
MHP270 SERIES
65 WATT
MHP27015D
MIN TYP MAX
14.85 15.00 15.15
14.85 15.00 15.15
0
0
±2.16
—
3.46
65
125
150
UNITS
VDC
mA
W
mV p-p
mV
Electrical Characteristics: 25°C Tc, 270 VDC Vin, 100% load, free run, unless otherwise specified.
150
750
400
450
20
3.00
8
15
45
—
19
±1.5
900
500
mV
mV
VDC
V
mA
A
mA
mA p-p
%
W
V
mV pk
µs
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
6
STEP LOAD
RESPONSE ± V
OUT
Notes
1. Up to 80% of the total output power is available from either output.
2. Connect Share pin (12) to Output Common (8) when not in use.
3. Assumes balanced loads on the outputs.
4. Effect on the negative output under the following conditions:
+I
OUT
70% to 30% of total power; –I
OUT
30% to 70% of total power
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
8
7
+
RL
Inhibit
Sync In
Sense Return
–
Output Common
Positive Output
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
+
RL
–
SINGLE OUTPUT MODELS CONNECTION DIAGRAM - PARALLEL
MHP270 #1
Sync Out
Sync In
Output Common
Positive Output
MODEL NUMBERING KEY
MHP
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
270 05 S / ES
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
MHP270 #2
Sync Out
Sync In
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 Figures 5 and 6 for dimensions.
10
9
8
7
Pin 6 should be connected to input common if external
sync (Sync In) is not used.
Sense pins must be connected to their respective outputs
if not used.
Share operation not characterized for dual outputs.
F
IGURE
3: P
IN
O
UT
4
DC/DC C
ONVERTERS
Angled corner indicates pin one
MHP270 SERIES
65 WATT
1.505 max (38.23)
CASE U
TOP VIEW
(PIN SIDE)
See Figure 5 for dimensions
3.005 (76.33) max.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins
#52 alloy/Gold
compression glass seal
F
IGURE
5: C
ASE
U M
AXIMUM
D
IMENSIONS
Angled corner
indicates pin one.
1.505 (38.23) max.
1.380 (35.05)
1.250 (31.75)
1.050 (26.67)
0.850 (21.59)
0.650 (16.51)
0.450 (11.43)
0.250 (6.35)
0.120 (3.05)
0.000
Seam Seal
0.23 (5.8) Lead Length
0.128 dia
(3.25).
0.040 dia
(1.02)
1
2
3
12
11
10
TOP VIEW CASE U
4
5
6
9
8
7
2.880 (73.15)
3.005 (76.33) max.
0.400 (10.16)
max.
0.120 (3.05)
0.250 (6.35)
2.750 (69.85)
0.220 (5.59
F
IGURE
6: C
ASE
U
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 dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places, ±0.01
(0.2) for two decimal places unless otherwise specified
Although every effort has been made to render the case
drawings at actual size, variations in the printing process
may cause some distortion. Please refer to the numerical
dimensions for accuracy.
0.050 (1.27)
0.000
0.000
5
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