MODELS

VDC O

UTPUT

SINGLE

12
15
28

DUAL

±5

±12
±15

DESCRIPTION

The MHP270 SeriesTM 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.

DC/DC C

ONVERTERS

270 V

OLT

NPUT

MHP270 SERIES

65 WATT

EATURES

· 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

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

TYPICAL CHARACTERISTICS

SYNC AND INHIBIT (INH1, INH2)

RECOMMENDED OPERATING CONDITIONS

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

MHP270 SERIES
65 WATT

DC/DC C

ONVERTERS

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

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.

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

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.

SINGLE OUTPUT MODELS

MHP27005S

MHP27012S

MHP27015S

MHP27028S

PARAMETER

CONDITION

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

4.95

5.00

5.05

11.88 12.00 12.12

14.85 15.00 15.15

27.22 28.00 28.28

VDC

OUTPUT CURRENT

= 160 TO 400 VDC

4.33

2.32

OUTPUT POWER

= 160 TO 400 VDC

OUTPUT RIPPLE

VOLTAGE

10 kHz - 2 MHz

280

mV p-p

LINE REGULATION

= 160 TO 400 VDC

120

150

280

LOAD REGULATION

NO LOAD TO FULL

120

150

280

INPUT VOLTAGE

CONTINUOUS

160

270

400

160

270

400

160

270

400

160

270

400

VDC

TRANSIENT

50 ms

450

INPUT CURRENT

NO LOAD

INHIBITED - INH1

INHIBITED - INH2

INPUT RIPPLE

CURRENT

10 kHz - 10 MHz

mA p-p

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

SHORT CIRCUIT

OUT

1.5

1.0

VDC

STEP LOAD RESP.

50% 100% 50%

TRANSIENT

300

700

1800

mV pk

RECOVERY

300

500

300

1000

µs

MHP270 SERIES

65 WATT

DC/DC C

ONVERTERS

Electrical Characteristics: 25°C Tc, 270 VDC Vin, 100% load, free run, unless otherwise specified.

DUAL OUTPUT MODELS

MHP27005D

MHP27012D

MHP27015D

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

OUT

4.95

5.00

5.05

11.88 12.00

12.12 14.85 15.00

15.15

VDC

OUT

4.95

5.00

5.05

11.88 12.00

12.12

14.85 15.00

15.15

OUTPUT CURRENT

= 160 TO 400 VDC

±5

8.0

±2.5

4.0

±2.16

3.46

OUTPUT POWER

= 160 TO 400 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

VOLTAGE

± V

OUT

100

125

mV p-p

LINE REGULATION

= 160 TO 400 VDC

± V

OUT

100

120

150

LOAD REGULATION

2, 3

NO LOAD TO FULL

± V

OUT

100

120

150

CROSS REGULATION

EFFECT ON V

OUT

1000

800

750

INPUT VOLTAGE

CONTINUOUS

160

270

400

160

270

400

160

270

400

VDC

TRANSIENT

50 ms

450

INPUT CURRENT

NO LOAD

FULL LOAD

2.5

2.80

3.00

INHIBITED - INH1

INHIBITED - INH2

INPUT RIPPLE

CURRENT

10 kHz - 10 MHz

mA p-p

EFFICIENCY

BALANCED LOAD

LOAD FAULT

POWER DISSIPATION

SHORT CIRCUIT

7.5

OUT

±2.0

±1.0

±1.5

STEP LOAD

50 %100% LOAD

RESPONSE ± V

OUT

TRANSIENT

300

900

mV pk

RECOVERY

500

µs

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:

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.

REMOTE SENSE CONNECTION

270 V

Inhibit

Sync In

Positive Input

Input Common

INH2

INH1

Sync Out

Sync In

N/C

Pos. Sense

Sense Return

Output Common

Positive Output

IGURE

1: S

ENSE

ONNECTIONS

SINGLE OUTPUT MODELS CONNECTION DIAGRAM - SENSE

MHP270 SERIES
65 WATT

DC/DC C

ONVERTERS

MHP270 #1

MHP270 #2

MHP270 #N

270V

Positive Input

Input Common

INH2

INH1

Sync Out

Sync In

N/C

Pos. Sense

Sense Return

Output Common

Positive Output

Positive Input

Input Common

INH2

INH1

Sync Out

Sync In

N/C

Pos. Sense

Sense Return

Output Common

Positive Output

Positive Input

Input Common

INH2

INH1

Sync Out

Sync In

N/C

Pos. Sense

Sense Return

Output Common

Positive Output

IGURE

2: P

ARALLEL

ONNECTIONS

PIN OUT

Pin

Single Output

Dual Output

Positive Input

Input Common

Inhibit 2 (INH2)

Inhibit 1 (INH1)

Sync Out

Sync In

Positive Output

Output Common

Sense Return

Negative Output

Positive Sense

No connection

MODEL NUMBERING KEY

MHP 270 05 S / ES

Base Model

Input Voltage

Output Voltage

Screening

Number of Outputs

(S = single, D = dual)

(Standard screening has no designator
in this position.)

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.

Angled corner indicates pin one.

TOP VIEW

MHP

(Pin side, marked side)

See Figures 5 and 6 for dimensions.

IGURE

3: P

SINGLE OUTPUT MODELS CONNECTION DIAGRAM - PARALLEL

MHP270 SERIES

65 WATT

DC/DC C

ONVERTERS

Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins

#52 alloy/Gold

compression glass seal

CASE U

TOP VIEW

(PIN SIDE)

See Figure 5 for dimensions

1.505 max (38.23)

3.005 (76.33) max.

Angled corner indicates pin one

IGURE

5: C

ASE

U M

AXIMUM

IMENSIONS

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.

Angled corner

indicates pin one.

0.000

0.050 (1.27)

0.000

0.120 (3.05)

0.250 (6.35)

0.450 (11.43)

0.650 (16.51)

0.850 (21.59)

1.050 (26.67)

1.250 (31.75)

1.380 (35.05)

1.505 (38.23) max.

0.000

0.120 (3.05)

0.250 (6.35)

2.750 (69.85)

2.880 (73.15)

3.005 (76.33) max.

0.128 dia
(3.25).

0.040 dia

(1.02)

0.23 (5.8) Lead Length

0.400 (10.16)

max.

0.220 (5.59

Seam Seal

TOP VIEW CASE U

IGURE

6: C

ASE

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