MODELS

VDC O

UTPUT

SINGLE

12
15

DUAL

±12
±15

DESCRIPTION

The MHE SeriesTM and the MLP SeriesTM DC/DC converters offer
the high efficiencies associated with switching regulators, yet have
full isolation and the excellent regulation typical of linear regulators.
No external components are required for operation. MHE Series and
MLP Series converters are built using thick-film hybrid technology,
and are sealed in metal packages for military, aerospace, and other
high-reliability applications. Unscreened models are solder sealed
and are guaranteed to pass a gross leak test (maximum leak rate of
1 x 10

-3

atm.-cc/sec). Environmentally screened models are

hermetically sealed and are screened as described in Section C2.

The MHE Series and MLP Series converters are pulse-width modu-
lated switching regulators operating in the forward mode, with a
nominal switching frequency of 125 to 140 kHz. Isolation is achieved
through the use of a transformer in the forward power circuit, and an
optocoupler is used in the feedback/control loop. The full load output
power is available over the full input voltage range. Short-term tran-
sients of 50 volts will not impair normal operation for 28 volt input
models.

The efficiency is typically greater than 80% over the entire input
voltage range and from approximately 25% of full load to full load.
This feature makes the MHE/MLP Series converters ideal for either
battery or aircraft power applications.

An inhibit function is provided on MHE/MLP Series converters to
allow power shutdown and startup from a logic input. The unit is
inhibited when the inhibit input pin (pin 2) is connected to the input
common (pin 10). The open circuit voltage of the inhibit pin is 8 to
10 VDC for 12 V input models or 11 to 13 VDC for 28 V input
models. During inhibit, the input inhibit pin must sink approximately
1 mA. In the inhibit mode, converter output drops to less than 1 V
and the input current is typically 8 mA.

Automatic current limiting circuitry protects the MHE/MLP Series
converters against short circuits.

MHE/MLP Series converters are rated to operate at full load up to a
case temperature of 85°C, with the output power derated linearly to
zero at 115°C. Because of the unit's high efficiency, heat sinking
requirements are minimized, but due consideration should be given
to removing self-generated heat when operating the device at
maximum ratings. To increase dissipation, heat conducting material
(PCB, copper sheet, heat sink, etc.) should be brought into contact
with the converter's baseplate.

When the MHE/MLP Series converters are used in applications
requiring full power operation for extended periods of time, or in
shock and vibration environments, it is highly recommended that the
flange-mount option be used. This option provides improved thermal
transfer capabilities as well as a mechanically secure mounting
configuration.

DC/DC C

ONVERTERS

AND

28 V

OLT

NPUT

MHE/MLP SERIES

20 WATT

B4-13

Size (max.): Non-flanged 2.125 x 1.125 x 0.495 MHE (case H6) inches

or 0.417 MLP (case H4)

(53.98 x 28.58 x 12.57 (MHE) or 10.59 (MLP) mm)

Flanged 2.910 x 1.125 x 0.495 MHE (case K7) inches

or 0.417 MLP (case K5)

(73.91 x 28.58 x 12.57 (MHE) or 10.59 (MLP) mm)

See Section B8, cases H4, H6, K5, and K7, for dimensions.

Weight:

50 grams typical

Screening: Standard or ES. See Section C2 for screening options, see

Section A5 for ordering information.

EATURES

· 55°C to +85°C operation
· 10 to 16 VDC input or

16 to 36 VDC input typical

· Fully isolated
· Opto-coupler feedback
· Fixed frequency 125 kHz typical
· Topology Push-Pull Forward
· Transient protection

50 V for up to 50 ms 28 Vin models

· Inhibit function
· Indefinite short circuit protection
· Trimmable output on single models
· Up to 83% efficiency

TYPICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

RECOMMENDED OPERATING CONDITIONS

INHIBIT

Output Power

· 10 to 20 watts depending on model

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 55°C to +125°C

B4-14

MHE/MLP SERIES
20 WATT

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 150 ppm/°C, typical

Input to Output Capacitance

· 60 pF, typical

Current Limit

· 125% of full load, typical

Isolation

· 100 megohm minimum at 500 V

Conversion Frequency

· 125 kHz, typical

Inhibit Pin Voltage (unit enabled)

· 11 to 13 V MHE28XXX, MLP28XXX
· 8 to 10 V MHE12XXX

Input Voltage Range

Continuous
· 17 to 40 VDC MHE28XXX
· 10 to 16 VDC MHE12XXX
· 16 to 40 VDC MLP28XXX
Transient
· 50 V for 50 msec on 28 V input models

Case Operating Temperature (Tc)

· 55°C to +85°C full power

Derating Output Power/Current

· Linearly from 100% at 85°C to 0% at 115° C
· MHE28XXX models derate by 33% at 16 Vin

Inhibit TTL Open Collector

· Logic low (output disabled)

Logic low voltage

0.8 V

· Referenced to input common
· Logic high (output enabled)

Open collector

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

SINGLE OUTPUT MHE12XX MODELS

MHE1205S

MHE1212S

MHE1215S

PARAMETER

CONDITION

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

VDC

OUTPUT CURRENT

55°C TO +85°C

1.25

1.0

OUTPUT POWER

55°C TO +85°C

OUTPUT RIPPLE
VOLTAGE

0 TO 1 MHz

mV p-p

LINE REGULATION

MIN TO MAX

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

INPUT RIPPLE
CURRENT

10 kHz 2 MHz

mA p-p

EFFICIENCY

SINGLE AND DUAL MLP MODELS

MLP2805S

MLP2812S

MLP2815S

MLP2812D

MLP2815D

PARAMETER

CONDITIONS

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

±11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15

VDC

OUTPUT CURRENT

55 TO +85°C

1.25

±0.41

±0.33

OUTPUT POWER

55 TO +85°C

OUTPUT RIPPLE
VOLTAGE

0 - 1 MHz

mV p-p

LINE REGULATION

MIN TO MAX

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

INPUT RIPPLE

CURRENT

10 kHz - 2 MHz

mA p-p

EFFICIENCY

B4-15

MHE/MLP SERIES

20 WATT

DC/DC C

ONVERTERS

Note
1. On dual output models at least 25% of the load should be on the positive output.

Electrical Characteristics: 25°C Tc, 28 VDC Vin (12 Vin for 12 V models), 100% load, unless otherwise specified.

SINGLE AND DUAL MHE28XX MODELS

MHE2805S

MHE2812S

MHE2815S

MHE2812D

MHE2815D

PARAMETER

CONDITIONS

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

±11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15

VDC

OUTPUT CURRENT

55 TO +85°C

3.0

1.67

1.33

±0.63

±0.5

OUTPUT POWER

55 TO +85°C

OUTPUT RIPPLE
VOLTAGE

0 - 1 MHz

mV p-p

LINE REGULATION

MIN TO MAX -- 2 5 -- 3 10 -- 3 10 -- 3 10 -- 3 1

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

INPUT RIPPLE

CURRENT

10 kHz - 2 MHz

mA p-p

EFFICIENCY

TYPICAL PERFORMANCE CURVE

OUTPUT ADJUSTMENT RESISTOR VALUES

FOR MHE2805S AND MLP2805S

B4-16

MHE/MLP SERIES
20 WATT

DC/DC C

ONVERTERS

IGURE

Output Power (Watts)

MLP2815S Efficiency

ffic

)

2.5

15.0

5.0

7.5

10.0

12.5

18 V

28 V

36 V

MODEL NUMBERING KEY

MHE 28 12 S F / ES

Base Model

Input Voltage

Output Voltage

Screening

Number of Outputs

Case Option
(Non-flanged case has no designator in
this position)

(S = single, D = dual)

(Standard screening has no designator
in this position.)

PIN OUT

Pin

Single Output

Dual Output

Positive Input

Inhibit

Output Adjust

Positive Output

Output Common

Positive Output

Negative Output

No connection

Case Ground

No connection

Input Common

BOTTOM VIEW

MHE and MLP

Squared corner and dot on

top of cover indicate pin one.

Dotted line outlines flanged package option.

See Section B8, case H4, H6, K5 and K7 for dimensions.

Output Adjustment all single output models:
The output can be adjusted upward by using the output
adjust (pin3). The resistance between output adjust (pin 3)
and output common (pin 4) will determine the magnitude of
the increase in the output. The table above is applicable
only to MHE2805S and MLP2805S.

Resistance

Output Voltage

Pin 3 to 4

Increase (%)

390K

+1%

145K

+2%

63K

+3%

22K

+4%

+5%

IGURE

1: P

22820-001-DTS Rev

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 spec-
ifications without notice. MHE Series and MLP Series are trademarks of Interpoint.
Copyright © 1995 - 1999 Interpoint. All rights reserved.

B8-17

CASE H

ASES

CASE H

BOTTOM VIEW

See Figures 29 34

for pin configurations.

2.125 max

(53.98)

1.125 max

(28.58)

Materials
Header Cold Rolled Steel/Nickel/Gold

cases H1 and H2

Cold Rolled Steel/Nickel/Tin

cases H3, H4, and H5

Cover Kovar/Nickel

cases H1 and H2

Cold Rolled Steel/Nickel/Tin

cases H3, H4, and H5

Pins #52

alloy

ceramic seal

case H1

case H2 (except MHV Series Single and Dual)

compression glass seal

MHV Series Single and Dual
case H3, H4, H5

Case dimensions in inches (mm)
Tolerance

0.005 (0.13) for three decimal places

0.01 (0.3) 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.

Dot on top of case indicates pin one

0.155 (3.94)

0.955 (24.26)

Seam Seal

0.000

0.040 dia
(1.02)

0.000

0.400 max.

(10.16)

0.25

0.03

(6.4

0.8)

0.555 (14.1)

0.245

(6.22)

1.845

(46.86)

2.090

(53.01)

1.110 (28.19)

FMC EMI Filter: Screening Standard, ES, or 883
SFMC EMI Filter: Screening Space Standard, H, or K

BOTTOM VIEW CASE H1

Squared corner and dot on top
of case indicate pin one.

IGURE

29: C

ASE

IGURE

28: C

ASE

H M

AXIMUM

IMENSIONS

Note: 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.

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