MODELS

VDC O

UTPUT

B4-17

EATURES

· 55°C to +85°C operation
· 4 to 8 VDC input
· Fully isolated
· Opto-coupler feedback
· Fixed frequency, 210 kHz typ.
· Inhibit function
· Indefinite short circuit protection
· Up to 80% efficiency

DUAL

±12
±15

DESCRIPTION

The MHL SeriesTM of DC/DC converters offers either ±12 or ±15 volt
outputs in a single package. MHL converters offer the high efficiency
and wide input range of switching regulators with excellent load and
line regulation. Input and output grounds are isolated from one
another and from case ground. No external components are
required for operation. The units are built using thick-film hybrid
technology and are sealed in metal packages for military, aero-
space, and other high-reliability applications. Unscreened models
are sealed with solder and are guaranteed to pass a gross leak test
(maximum leak rate of 1 x 10

-3

atm.-cc/sec). Environmentally

screened models (/ES) are hermetically sealed with solder and will
pass a fine leak and gross leak test as described in Section C2.

The MHL converters employ pulse-width modulated switching regu-
lator techniques in the forward mode, with a nominal clock
frequency of 210 kHz. Isolation is achieved through the use of a
transformer in the forward power circuit and an opto-coupler in the
feedback/control loop. The full load output power (15 watts) is avail-
able over the input range of 4 to 8 VDC. Up to 14.3 watts can be
obtained from a single output up to a combined load of 15 watts.

The efficiency is high over the entire input voltage range and from
approximately 25% of full load to full load. This feature makes the
converters ideal for either battery or aircraft power applications.

An inhibit function is provided to allow power shut-down and start-
up from a logic input. An open circuit on the inhibit terminal produces
normal operation, and a low level disables the converter. Input
current in the inhibit mode is typically 20 mA. The converter features
a "soft-start" function which provides a controlled 20 millisecond
turn-on upon application of input power or inhibit release.

An input filter is incorporated in the unit to reduce input reflected
ripple current. Both outputs are indefinitely protected against short
circuits to ground or to one another by automatic current limiting
circuitry. This feature adjusts the converter's output current, indefi-
nitely maintaining it below approximately 125% of the rated
maximum during a full short circuit condition.

The MHL Series of converters is rated to operate at full load at a
case temperature of 85°C, with the output power derated linearly to
zero at 115°C (0.5W/°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 mate-
rial (PCB, copper sheet, heat sink, or Interpoint's TMP accessory)
should be brought into contact with the converter's baseplate.

When the MHL is used in applications requiring full-power operation
for extended periods of time, or in shock and vibration environ-
ments, it is highly recommended that the flange-mount case option
be used. This option provides improved thermal transfer capabilities
as well as mechanically secure mounting configuration.

DC/DC C

ONVERTERS

5 V

OLT

NPUT

MHL SERIES

15 WATT

Size (max.): Non-flanged, case F4

1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm)

Flanged, case J5

2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm)

See Section B8, cases F4 and J5, for dimensions.

Weight:

57 grams typical

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

A5 for ordering information.

IGURE

MHL0515D Efficiency

OUTPUT POWER (WATTS)

EFFICIENCY (%)

=8 V

=4 V

=5 V

Typical Performance Curve

PIN OUT

MODEL NUMBERING KEY

RECOMMENDED OPERATING CONDITIONS

TYPICAL CHARACTERISTICS

INHIBIT

ABSOLUTE MAXIMUM RATINGS

MHL0512D

MHL0515D

PARAMETER

CONDITIONS

MIN

TYP

MAX MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

OUT

11.88

12.00

12.12

14.85

15.00

15.15

VDC

OUT

11.88

12.00

12.12

±14.85

15.00

15.15

OUTPUT CURRENT

1.25

1.00

OUTPUT POWER

Tc = 55°C TO +85°C

15.0

OUTPUT RIPPLE

BW = 1 MHz

100

120

mV p-p

LINE REGULATION

OUT

0.05

0.10

0.05

0.10

4 TO 8 V

OUT

0.05

0.15

0.05

0.15

LOAD REGULATION

OUT

0.05

0.15

0.03

0.10

NO LOAD TO FULL

OUT

0.25

0.50

0.20

0.40

CROSS REGULATION

OUT

2.2

3.5

1.9

3.0

OUT

2.2

3.5

1.9

3.0

INPUT VOLTAGE

Tc = 55°C TO +85°C

VDC

INPUT CURRENT

NO LOAD

120

150

140

180

FULL LOAD

4500

INHIBITED

INPUT RIPPLE CURRENT

120

150

mA p-p

EFFICIENCY

FULL LOAD

Input Voltage

· 4 to 8 VDC

Output Power

· 15 watts

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 55°C to +125°C

B4-18

MHL SERIES
15 WATT

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 150 ppm/°C, typical

Input to Output Capacitance

· 80 pF typical

Isolation

· 100 megohm minimum at 500 V

Conversion Frequency

· 210 kHz, typical

Input Voltage Range

· 4 to 8 VDC continuous

Case Operating Temperature (Tc)

· 55°C to +85°C full power
· 55°C to +115°C absolute

Derating Output Power/Current

· Linearly from 100% at 85°C to 0% at 115° C

Notes
1. 95% of the maximum current or power is available from either output. The total of both outputs must not exceed the

maximum specification.

2. The effect on the positive output when it is held at 50 mA while the negative output is varied from 50 to 950 mA.

The effect on the negative output when it is held at 50 mA while the positive output is varied from 50 to 950 mA.

Inhibit TTL Open Collector

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

Open collector

Pin

Designation

1,2

Positive Input

Positive Output

Output Common

Negative Output

No Connection

Case Ground

Inhibit

9, 10

Input Common

Electrical Characteristics: 25°C Tc, 5 VDC Vin, 100% load, unless otherwise specified.

BOTTOM VIEW

MHL

Squared corner and dot on

top of cover indicate pin one.

Dotted line outlines
flanged package
option.

See Section B8, cases F4 and J5 for dimensions.

IGURE

2: P

MHL 05 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.)

23002-001-DTS Rev A

DQ# 1018

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. MHL Series is a trademark of Interpoint.
Copyright © 1994 - 1999 Interpoint. All rights reserved.

B8-12

CASE F

ASES

Materials
Header Case F1

Cold Rolled Steel/Nickel/Gold

Cases F2 - F4

Cold Rolled Steel/Nickel/Tin

Cover Case

Kovar/Nickel

Cases F2 - F4

Cold Rolled Steel/Nickel/Tin

Pins

#52 alloy (all cases)

MHV Series Triple compression glass seal
MTR Series Triple, case F1 ceramic seal
MTR Series Triple, case F2 compression glass seal
HUM40 compression glass seal or ceramic seal
Case F3 compression glass seal
Case F4 compression glass seal or ceramic 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

CASE F

BOTTOM VIEW

See Figures 20 - 23 for pin configuration

1.350 max

(34.29)

1.950 max

(49.53)

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

0.000

0.170

(4.32)

1.170

(29.72)

0.000

0.170

(4.32)

0.570

(14.48)

0.970

(24.64)

1.370

(34.80)

1.770

(44.96)

0.040 dia.
(1.02)

0.000

0.25 (6.4)

MTR

Series

MHV

Series

0.405 max

(10.29)

0.000

0.405 max

(10.29)

Bathtub

Platform

MTR Series Triple and MHV Series Triple: Screening Standard, ES, or 883

BOTTOM VIEW CASE F1

Seam Seal

0.25 (6.4)

Dot on top of case indicates pin one

IGURE

20: C

ASE

IGURE

19: C

ASE

F 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.

B8-22

CASE J

ASES

Materials
Header Case J1

Cold Rolled Steel/Nickel/Gold

Cases J2 - J5

Cold Rolled Steel/Nickel/Tin

Cover Case

Kovar/Nickel

Case J2 - J5

Cold Rolled Steel/Nickel/Tin

Pins

#52 alloy (all cases)
Case J1

MHV Series Triple compression glass seal
MTR Series Triple ceramic seal

Cases J2 - J5

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

CASE J

BOTTOM VIEW

See Figures 36 - 40
for pin configuration

1.350 max

(34.29)

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.

Flange Thickness:

Cases J1 and J5

0.060 (1.52)

Case J2

0.073 (1.85) max

Cases J3 and J4

0.067 +0.005/-0.007 (1.70 +0.13/-0.8)

2.720 max

(69.09)

Dot on top of case indicates pin one

IGURE

35: C

ASE

J 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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