Size (max.): Non flanged 1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm)

Flanged 2.005 x 1.130 x 0.330 (50.93 x 28.70 x 8.38 mm)

Weight:

30 grams maximum.

Screening: Standard, ES, or 883 (Class H).

DESCRIPTION

The MHF+ SeriesTM of high frequency DC/DC converters offers a
wide input voltage range of 16 to 40 volts and up to 15 watts of
output power. The units are capable of withstanding short term tran-
sients up to 50 volts. The package is a hermetically sealed, welded
metal case. Flanged and non-flanged models are available.

ONVERTER

ESIGN

The MHF+ converters are switching regulators that use a quasi-
square wave, single-ended forward converter design with a constant
switching frequency of 550 kHz. Isolation between input and output
circuits is provided with a transformer in the forward path and a
temperature compensated optical link in the feedback control loop.

For the MHF+ dual output models, good cross regulation is main-
tained by tightly coupled output magnetics. Up to 90% of the total
output power (80% on 2805D) is available from either output,
providing the opposite output is simultaneously carrying 10% of the
total output power (20% on 2805D models). Predictable current limit
is accomplished by directly monitoring the output load current and
providing a constant current output above the overload point.

IGHER

OWER

ENSITY

The MHF+ Series offers a new standard of performance for small
size and high power density. At just 0.33 inch high and a total foot-
print of 1.7 in

this low profile package offers a total power density

of up to 28 watts per cubic inch.

OISE

, H

IGH

UDIO

EJECTION

The MHF+ converters' feed-forward compensation system provides
excellent dynamic response and noise rejection. Audio rejection is
typically 50 dB. Typical output voltage response for a 50% to 100%
step load transient is as low as 1.3% with a 150 msec recovery time.
Input ripple current is typically 35 mA p-p with output ripple voltage
typically 30 mV p-p .

NHIBIT

UNCTION

MHF+ converters provide an inhibit terminal that can be used to
disable internal switching, resulting in no output and very low quies-
cent input current. The converter is inhibited when a TTL compatible
low (

0.8 output disabled) is applied to the inhibit pin. The unit is

enabled when the pin, which is internally connected to a pull-up
resistor, is left unconnected or is connected to an open-collector
gate. The open circuit output voltage associated with the inhibit pin
is 8.5 to 12 V. In the inhibit mode, a maximum of 4 mA must be sunk
from the inhibit pin.

YNCHRONIZATION

A synchronization feature is included with the MHF+ Series that
allows the user to match the switching frequency of the converter to
the frequency of the system clock. An external synchronization
feature is included that allows the user to adjust the nominally 550
kHz operating frequency to any frequency within the range of 500
kHz to 600 kHz. This is initiated by applying a TTL compatible input
of the desired frequency to pin 5.

HORT

IRCUIT

ROTECTION

MHF+ Series converters provide short circuit protection by
restricting the output current to approximately 115% of the full load
output current. The output current is sensed in the secondary stage
to provide highly predictable and accurate current limiting, and to
eliminate foldback characteristics.

NDERVOLTAGE

OCKOUT

Undervoltage lockout prevents the units from operating below
approximately 12 VDC input voltage to keep system current levels
smooth, especially during initialization or re-start operations.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MHF+ SERIES

SINGLE & DUAL

15 WATT

EATURES

· 55° to +125°C operation
· 16 to 40 VDC input
· Fully isolated
· Optocoupler feedback
· Fixed frequency, 550 kHz typical
· Topology Single Ended Forward
· 50 V for up to 50 ms transient protection
· Inhibit and sync functions
· Indefinite short circuit protection
· Undervoltage lockout
· Up to 84% efficiency, 28 W/in

MODELS

VDC O

UTPUT

SINGLE

3.3

5.2

12
15
28

DUAL

±5

±12
±15

RECOMMENDED OPERATING CONDITIONS

TYPICAL CHARACTERISTICS

SYNC AND INHIBIT

ABSOLUTE MAXIMUM RATINGS

Input Voltage

· 16 to 40 VDC

Power Dissipation (Pd)

· 6 W

Output Power

· 12 to 15 watts depending on model

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 65°C to +150°C

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 100 ppm/°C typical
· 150 ppm/°C maximum

Input to Output Capacitance

· 60 pF typical

Undervoltage Lockout

· 12 V input typical

Current Limit

· 115% of full load typical

Isolation

· 100 megohm minimum at 500 V

Audio Rejection

· 50 dB typical

Conversion Frequency (55°C to +125°C Tc)

· Free run 550 kHz typical

480 kHz min, 620 kHz max

Inhibit Pin Voltage (unit enabled)

· 8.5 to 12 V

Input Voltage Range

· 16 to 40 VDC continuous
· 50 V for up to 50 msec transient

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 55°C to +135°C absolute

Derating Output Power/Current (Tc)

· Linearly from 100% at 125°C to 0% at 135°C

MHF+ SERIES
SINGLE AND DUAL
15 WATT

SINGLE OUTPUT MODELS

MHF+283R3S

MHF+2805S

MHF+285R2S

PARAMETER

CONDITION

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

3.27

3.30

3.33

4.95

5.00

5.05

5.16

5.20

5.24

VDC

OUTPUT CURRENT

= 16 to 40 VDC

2.4

OUTPUT POWER

= 16 to 40 VDC

12.48

OUTPUT RIPPLE

10 kHz - 2 MHz

mV p-p

VOLTAGE

Tc = 55°C to +125°C

120

100

LINE REGULATION

Vin = 16 to 40 VDC

100

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

FULL LOAD

397

560

624

560

605

INHIBITED

INPUT RIPPLE

10 kHz - 10 MHz

100

CURRENT

Tc = 55°C to +125°C

120

100

mA pp

EFFICIENCY

LOAD FAULT

SHORT CIRCUIT

POWER DISSIPATION

3.5

RECOVERY

7.5

STEP LOAD RESP.

50% 100% 50%

TRANSIENT

400

150

500

400

150

400

150

400

mV pk

RECOVERY

150

300

150

300

150

300

µs

STEP LINE RESP.

16 40 16 VDC

TRANSIENT

800

550

800

550

800

550

800

mV pk

RECOVERY

0.8

1.2

0.8

1.2

0.8

1.2

START-UP

DELAY

OVERSHOOT

200

300

100

600

100

600

mV pk

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

Notes
1. Indefinite short circuit protection not guaranteed above 125°C (case)
2. Recovery time is measured from application of the transient

to the point at which Vout is within regulation.

3. Input step transition time >10 µs.
4. Input step transition time <100 µs.

Sync In (500 to 600 kHz)

· Duty cycle 40% to 60%
· Logic low 0.8 V max
· Logic high 4.5 V min, 5 V max
· Referenced to input common
· If not used, connect to input common

Inhibit TTL Open Collector

· Logic low (output disabled)

Logic low voltage

0.8 V

Inhibit pin current 4.0 mA max

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

Open collector or unconnected

DC/DC C

ONVERTERS

MHF+ SERIES

SINGLE AND DUAL

15 WATT

SINGLE OUTPUT MODELS

MHF+2812S

MHF+2815S

MHF+2828S

PARAMETER

CONDITION

MIN TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

11.88 12.00 12.12

14.85 15.00 15.15

27.72 28.00 28.28

VDC

OUTPUT CURRENT

= 16 to 40 VDC

1.25

1.00

0.54

OUTPUT POWER

= 16 to 40 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

120

mV p-p

VOLTAGE

Tc = 55°C to +125°C

120

100

180

LINE REGULATION

Vin = 16 to 40 VDC

150

LOAD REGULATION

NO LOAD TO FULL

150

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

FULL LOAD

680

752

670

752

640

760

INHIBITED

INPUT RIPPLE

10 kHz - 10 MHz

CURRENT

Tc = 55°C to +125°C

120

mA pp

EFFICIENCY

LOAD FAULT

SHORT CIRCUIT

POWER DISSIPATION

3.5

RECOVERY

7.5

STEP LOAD RESP.

50% 100% 50%

TRANSIENT

500

150

500

600

200

600

800

600

800

mV pk

RECOVERY

150

300

150

300

200

400

µs

STEP LINE RESP.

16 40 40 VDC

TRANSIENT

800

550

800

550

800

1200 1100 1200

mV pk

RECOVERY

0.8

1.2

0.8

1.2

0.8

1.2

START-UP

DELAY

OVERSHOOT

200

1200

200

1500

200

280

mV pk

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

Notes
1. Indefinite short circuit protection not guaranteed above 125°C (case)
2. Recovery time is measured from application of the transient to point at

which Vout is within regulation.

3. Input step transition time >10 µs.
4. Input step transition time <100 µs.

DC/DC C

ONVERTERS

MHF+ SERIES
SINGLE AND DUAL
15 WATT

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

DUAL OUTPUT MODELS

MHF+2805D

MHF+2812D

MHF+2815D

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

4.92

5.00

5.08

11.82

12.00

1218

14.78

15.00

15.23

OUTPUT CURRENT

= 16 to 40 VDC

±1.2

1.92

±0.625

1.125

±0.500

0.900

OUTPUT POWER

= 16 to 40 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

VOLTAGE ±V

OUT

Tc = 55°C to +125°C

120

mV p-p

LINE REGULATION

BALANCED +V

OUT

Vin = 16 to 40 VDC

LOAD

OUT

100

LOAD REGULATION

BALANCED +V

OUT

LOAD

OUT

100

CROSS REGULATION

NEGATIVE V

OUT

7.5

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 50 msec

INPUT CURRENT

NO LOAD

FULL LOAD

540

600

645

754

638

754

INHIBITED

INPUT RIPPLE

10 kHz - 10 MHz

CURRENT

Tc = 55°C to +125°C

100

mA p-p

EFFICIENCY

LOAD FAULT

SHORT CIRCUIT

POWER DISSIPATION

RECOVERY

7.5

STEP LOAD RESP.

50% 100% 50%

BALANCED LOADS

TRANSIENT

OUT

600

200

600

300

600

300

600

mV pk

OUT

600

150

600

100

500

600

100

600

RECOVERY

150

500

200

400

200

500

µs

STEP LINE RESP.

16 40 40 VDC

± V

OUT

TRANSIENT

800

600

800

750

550

750

550

750

mV pk

RECOVERY

0.8

1.2

0.8

1.2

0.8

1.2

START-UP

DELAY

OVERSHOOT

100

250

200

750

200

750

mV pk

Notes
1. Up to 13.5 watts, 90% (9.6W, 80% for 2805D) of the total output power is

available from either output providing the opposite output is simultaneously
carrying 10% (20% for 2805D) of the total output power. Each
output must carry a minimum of 10% (20% for 2805D) of the total output
power in order to maintain regulation on the negative output.

2. Effect on Vout for the following conditions:

+Po = 50% to 10% and Po = 50%
+Po = 50% and Po = 50% to 10%

3. Indefinite short circuit protection not guaranteed above 125°C (case)
4. Recovery time is measured from application of the transient to point at

which Vout is within regulation.

5. Response of either output with the opposite output held at half of the total

output power.

6. Input step transition time >10 µs.
7. Input step transition time <100 µs.

PIN OUT

MHF+ 28 12 D F / 883

Base Model

Input Voltage

Output Voltage

Screening

Number of Outputs

(S = single, D = dual)

(R = decimal point, 3R3 = 3.3 Vout)

(Standard screening has no designator
in this position.)

Case Option

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

MHF+ SERIES
SINGLE AND DUAL
15 WATT

DC/DC C

ONVERTERS

SMD NUMBERS

MODEL NUMBERING KEY

Pin

Single Output

MHF+2828S

Dual Output

(Except MHF+2828S)

Inhibit

No connection

Positive Output

Output Common

(See note 1, below)

Output Common

Positive Output

Output Common

Negative Output

Sync Sync

Sync

Case Ground

Input Common

Positive Input

1. Pin 3 of MHF+2828S will provide 14 Vout referenced to output common (pin 4).
2. If Sync is not used, pin 5 should be connected to input common.

IGURE

2: P

TANDARD

ICROCIRCUIT

RAWING

(SMD)

IN PROCESS
5962-9213901HXC
IN PROCESS
5962-9166401HXC
5962-9160101HXC
5962-9689801HXC
5962-9555901HXC
5962-9214401HXC
5962-9161401HXC

MHF+
S

IMILAR

ART

MHF+283R3S/883
MHF+2805S/883
MHF+285R2S/883
MHF+2812S/883
MHF+2815S/883
MHF+2828S/883
MHF+2805D/883
MHF+2812D/883
MHF+2815D/883

BOTTOM VIEW

MHF+ SINGLE AND DUAL

NON-FLANGED OR FLANGED

Dot on top of cover

indicates pin one.

Dotted line outlines flanged package option.

For exact specifications for an SMD product, refer to the SMD
drawing. Call your Interpoint representative for status on the
MHF+ SMD releases which are "in process". SMDs can be
downloaded from
http://www.dscc.dla.mil/programs/smcr

See pages 9 and 10 for dimensions.

Flanged SMDs have the suffix HZC instead of HXC.

MHF+ SERIES

SINGLE AND DUAL

15 WATT

DC/DC C

ONVERTERS

Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.

IGURE

OUTPUT POWER (Watts)

MHF+2805D EFFICIENCY

(

)

40V

28V

16V

OUTPUT POWER (Watts)

MHF+2815D EFFICIENCY

(

)

40V

28V

16V

OUTPUT POWER (Watts)

MHF+2805S EFFICIENCY

(

)

16V

28V

40V

IGURE

OUTPUT POWER (Watts)

MHF+2812S EFFICIENCY

(

)

16V

40V

28V

IGURE

OUTPUT POWER (Watts)

MHF+2812D EFFICIENCY

(

)

40V

28V

16V

IGURE

OUTPUT POWER (Watts)

MHF+2815S EFFICIENCY

)

16V

40V

28V

FREQUENCY (kHz)

MHF+ SERIES AUDIO REJECTION

)

100

0.1

100

IGURE

1ms/div

16V TO 40V

MHF+2805S STEP LINE RESPONSE

VIN

VOUT

IGURE

µs/div

50% 100%

MHF+2805S STEP LOAD RESPONSE

100mV/div.

50% to 100%

100% to 50%

MHF+ SERIES
SINGLE AND DUAL
15 WATT

DC/DC C

ONVERTERS

Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.

IGURE

POSITIVE OUTPUT LOAD (% OF TOTAL LOAD)

OUT

WITH SHIFT IN LOAD BALANCE

CROSS REGULATION

OUT

(

)

100

2812D
2815D

2805D

OUTPUT POWER (Watts)

50 mV DROP

LOW LINE DROPOUT VS. LOAD

(

lts

)

MHF+2812S&D
MHF+2815S&D

MHF+2805S&D

µs/div

50% 100%

MHF+2815D +V

OUT

STEP LOAD RESPONSE

100mV/div.

50% to 100%

100% to 50%

PO= 7.5 W

IGURE

µs/div

20% 100%

MHF+2815D +VOUT STEP LOAD RESPONSE

20% to 100%

100% to 20%

PO= 7.5 W

IGURE

OUTPUT LOAD (%)

COND. A: 50% LOAD +V; 50% to 10% V
COND. B: 50% LOAD V; 50% to 10% +V

MHF+2805D/MHF+2812D/MHF+2815D

CROSS REGULATION

)

2815D

2812D

COND B

COND A

2805D

IGURE

2 ms/div

MHF+2815D TURN-ON INTO FULL LOAD

VIN

+VOUT

VOUT

IGURE

200

µs/div

10% 100%

MHF+2805S STEP LOAD RESPONSE

100mV/div.

10% to 100%

100% to 10%

1 ms/div

16V TO 40V

MHF+2815D STEP LINE RESPONSE

VIN

+VOUT

2 ms/div

MHF+2805S TURN-ON INTO FULL LOAD

1V/div.

VIN

20V/div.

VOUT

POUT= 12W

IGURE

DC/DC C

ONVERTERS

MHF+ SERIES

SINGLE AND DUAL

15 WATT

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.

CASE E

BOTTOM VIEW

See Figure 22

for pin configurations.

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

1.460 max

(37.08)

1.130 max

(28.70)

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

(SMHF Series

Cold Rolled Steel/Nickel/Gold)

Pins #52

alloy/Gold

compression glass seal

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.

IGURE

21: C

ASE

E M

AXIMUM

IMENSIONS

0.000

0.205

(5.21)

0.505

(12.83)

0.705

(17.91)

0.905

(22.99)

1.105

(28.07)

0.330 max

(8.38)

0.000

0.25 (6.35)

0.000

0.160

(4.06)

0.960

(24.38)

0.030 dia.
(0.76)

MHF+ Series Single and Dual: Screening Standard, ES, or 883

BOTTOM VIEW CASE E1

0.330 max

(8.38)

0.000

0.25 (6.35)

Projection Weld

Seam Seal

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

IGURE

22: C

ASE

DC/DC C

ONVERTERS

MHF+ SERIES
SINGLE AND DUAL
15 WATT

TEST

STANDARD

/ES

/883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032

yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C

yes

Method 1010, Cond. B, -55°C to 125°C

yes

CONSTANT ACCELERATION

Method 2001, 3000 g

yes

Method 2001, 500 g

yes

BURN-IN

Method 1015, 160 hours at 125°C

yes

96 hours at 125°C case (typical)

yes

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C

yes

Subgroups 1 and 4: +25°C case

yes

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A

yes

Gross Leak, Method 1014, Cond. C

yes

Gross Leak, Dip (1 x 10

-3

)

yes

FINAL VISUAL INSPECTION

Method 2009

yes

Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

*883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature

range of 55°C to +125°C.

ABLE

1: E

NVIRONMENTAL

CREENING

21621-001-DTS Rev B 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. MHF+ Series is a trademark of Interpoint.
Copyright © 1999-2000 Interpoint. All rights reserved.

Contact Information:

Interpoint Headquarters USA
Phone:

1-800-822-8782
+425-882-3100

Email:

power@intp.com

www.interpoint.com

Interpoint UK
Phone:

+44-1252-815511

Email:

poweruk@intp.com

Interpoint France
Phone:

+33-134285455

Email:

powerfr@intp.com

Size (max.): Non flanged, case E2, 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm)

Flanged , case G2, 2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm)
See Figures 13 - 16 for dimensions.

Weight:

32 grams maximum.

Screening: Standard, ES, or 883 (Class H). See Table 1 for screening options.

DESCRIPTION

Interpoint's MHF+ SeriesTM Triple DC/DC converters provide a wide
input voltage range of 16 to 48 VDC delivering 15 watts of total
output power with output voltages of +5 and ±12 or +5 and ±15
VDC. The main output, +5 VDC, will supply up to 7.5 watts and the
auxiliaries will supply up to 7.5 watts of combined power. Full power
operation at -55° C to +125°C plus the ability to withstand transients
of up to 80 V for up to 120 milliseconds make these converters an
ideal choice for your high reliability systems.

ONVERTER

ESIGN

MHF+ Triple Series of DC/DC converters incorporate dual-phase,
phase-shifted technology with a continuous flyback topology. This
design eliminates a minimum load requirement on the main output
and eliminates cross regulation effects between the main output
voltage and the auxiliary output voltages. The phase-shifted design
offers a further benefit in reduced input and output ripple.

NHIBIT

UNCTION

An open collector, TTL compatible, inhibit terminal (pin 1) provides
shut-down and start-up control. Applying a logic level low (<0.8 V),
referenced to input common, will disable the output of the converter.
When inhibited input current is reduced to 5 mA or less and there is
no generation of switching noise. The inhibit terminal typically sinks
3 mA when the converter is inhibited.

Leaving the terminal open or pulling it high will enable the converter.
Use an open collector interface for logic high voltages of up to 11
volts. (Refer to Figure 2 for a connection diagram.) An open collector
interface is not required if the logic high is in excess of the open
circuit voltage of the inhibit terminal, 11 volts, but less than 40 volts.

OFT

TART

EATURE

The soft-start feature provides a controlled 20 milliseconds turn-on
to minimize inrush current and reduce overshoot at initial start-up or
when inhibit is released.

YNCHRONIZATION

To synchronize the converter's switching frequency to a system
clock apply the clock signal to the sync terminal (pin 7). When
multiple converters are powered from a single power source, asyn-
chronous (free run) operation will result in lower peak noise for
common spectral peaks, but synchronous operation will eliminate
any possibility of interference frequencies in the low audio band.
Source impedance of the signal should be less than 100 ohms and
the transition time should be less than 100 nanoseconds. The
capacitively coupled sync input will synchronize on a differential
signal of as low as 4 volts to as high as 10 volts. If the sync function
is not used, the terminal should be left open.

HORT

IRCUIT

ROTECTION

Internal current limiting circuitry protects all three outputs against
short circuits. When output power exceeds approximately 130% of
maximum output power, the output currents are limited. In addition,
separate current limiting circuitry protects each output individually
resulting in normal operation of either the main or the auxiliaries,
whichever is not in a shorted condition.

ACKAGING

MHF+ Triple converters are packaged in hermetically sealed metal
cases. MHF+ Triple converters can be purchased in a flanged or
non-flanged case. The flanged option provides increased heat dissi-
pation and also provides greater stability when mechanically
secured.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MHF+ SERIES TRIPLE

15 WATT

EATURES

· 55° to +125°C operation
· 16 to 48 VDC input
· Fully Isolated
· Optocoupler feedback
· Fixed frequency 450 kHz
· Topology Current Mode Flyback
· Transient protection 80 V/120 ms
· Inhibit and sync functions
· Indefinite short circuit protection
· Undervoltage lockout
· Up to 76% efficiency

MODELS

VDC O

UTPUT

TRIPLE OUTPUT

+5 and ±12
+5 and ±15

RECOMMENDED OPERATING CONDITIONS

TYPICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATINGS

Input Voltage

· 16 to 48 VDC

Power Dissipation (Pd)

· 12 watts

Output Power

· 15 watts

Lead Soldering Temperature (10 sec per pin)

· 300°C

Storage Temperature Range (Case)

· 65°C to +150°C

MHF+ SERIES TRIPLE
15 WATT

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 150 ppm/°C typical

Current Limit

· 130% typical

Isolation

· 100 megohm minimum at 500 V

Conversion Frequency

· Free run 375 minimum, 500 kHz maximum
· External sync range 400 to 600 kHz

Inhibit Pin Voltage (unit enabled)

· 10 V typical

Input Voltage Range

· 16 to 48 VDC continuous
· 80 V for up to 120 msec

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 55°C to +135°C absolute

Derating Output Power/Current

· Linearly from 100% at 125°C to 0% at 135°C

SYNC AND INHIBIT

Sync 400 to 600 kHz

· Duty cycle 40% to 60%
· Logic low 0.8 V max
· Logic high 4.5 V min, 10.0 V max
· If not used, leave unconnected
· Referenced to input common

Inhibit: TTL Open Collector

· Logic low (output disabled)

Logic low voltage

0.8 V max

Inhibit pin current 3.0 typ, 5.0 max

· Referenced to input common
Logic high (output enabled)

Open collector
Unconnected or 11 to 40 V

PWM CM

CONTROLLER

180

PWM CM

CONTROLLER

INPUT

COMMON

FEEDBACK ISOLATOR

OUTPUT
COMMON

+ AUX.
OUTPUT

AUX.
OUTPUT

POSITIVE

INPUT

SYNC

+5 OUTPUT

IGURE

1: B

LOCK

IAGRAM

MHF+ SERIES TRIPLE

15 WATT

DC/DC C

ONVERTERS

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

MHF+28512T

MHF+28515T

PARAMETER

CONDITION

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

MAIN

4.95

5.0

5.05

4.925

5.0

5.05

+ AUXILIARY

11.64

12.0

12.36

14.55

15.0

15.45

VDC

AUXILIARY

11.64

12.0

12.36

14.55

15.0

15.45

OUTPUT CURRENT

MAIN

1.5

+ AUXILIARY

0.416

0.333

AUXILIARY

0.416

0.333

TOTAL

2.125

2.0

OUTPUT POWER

MAIN

7.5

+ AUXILIARY

AUXILIARY

TOTAL

OUTPUT RIPPLE

10 kHz to 2 MHz MAIN

VOLTAGE

10 kHz to 2 MHz ± AUXILIARY

112

mV p-p

LINE REGULATION

MAIN

= MIN. TO MAX.

±AUXILIARY

120

240

150

300

LOAD REGULATION

3, 4

MAIN

± AUXILIARY

120

240

150

300

CROSS REGULATION

AUXILIARY

1200

1500

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

FULL LOAD

705

724

705

724

INHIBITED

INPUT RIPPLE CURRENT

10 kHz to 10 MHz

mA p-p

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

MAIN

±AUXILIARY

STEP LOAD

TRANSIENT

RESPONSE

3, 7, 8

MAIN

850

mV pk

± AUXILIARY

750

RECOVERY MAIN

RECOVERY ±AUX.

START-UP

DELAY EACH OUTPUT

Notes
1. The sum of the 12 volt auxiliary output currents may not exceed 625 mA.

The sum of the 15 volt auxiliary output currents may not exceed 500 mA.

2. The sum of the auxiliary output power may not exceed 7.5 watts.
3. Case temperature 55°C to +125°C.
4. Load regulation for the +5 is specified at 0.0 to 1.5 A with the aux. both held

at 3.76 W (313 mA for the ±12, 250 mA for the ±15). Load regulation for the
aux. is specified as both aux. from 0.0 to 3.76 W (313 mA for ±12, 250 mA
for ±15) at the same time with the +5 held at 1.5 A.

5. Cross regulation only occurs between the two auxiliaries and is measured on

aux. +5 is held constant at 1.0 A. Cross regulation is specified for two
conditions:
Negative aux.= 3.76 W; positive aux.= 0.37 W to 3.76 W.
Negative aux. = 0.37 W to 3.76 W; positive aux. = 3.76 W.

6. Load fault = <0.05

7. Transition time is 2 10 µs.
8. Time to settle to within 1% of Vout final value.

Positive Input

28V

Input Common

FMH-461

EMI FILTER

Positive Output

Output Common

Positive Input

Input Common

MHF+ TRIPLE

Case*

*The case ground connection should be as low an impedance as possible to minimize EMI.

Direct contact of baseplate to chassis ground provides the lowest impedance.

Chassis Ground

Load

Positive Input

28V

Sync In

Inhibit

Input Common

+5 Output

Output Common

Aux. Output

+ Aux.

Load

Aux.

Load

+ Aux. Output

0.01 F

5.1k

200 pF

3.9 K

10 K

INHIBIT

MHF+ Triple

INPUT

COMMON

POSITIVE INPUT

10 k

1N4148

2N3501

MHF+ SERIES TRIPLE
15 WATT

DC/DC C

ONVERTERS

CONNECTION DIAGRAMS

IGURE

2: I

NHIBIT

NTERFACE

IGURE

3: AC C

OUPLING OF

YNC

IGNAL

IGURE

4: EMI F

ILTER

ONNECTION

If the sync terminal ([pin 7) is not used, it must be left floating.
The ac coupling shown will prevent sync signal failure.

SMD NUMBERS

PIN OUT

MHF+ 28 512 T F / ES

Base Model

Input Voltage

Output Voltage

Screening

Number of Outputs

(T = triple)

(Main and aux. Vout)

Case Option

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

(Standard screening has no designator
in this position.)

MHF+ SERIES TRIPLE

15 WATT

DC/DC C

ONVERTERS

MODEL NUMBERING KEY

Pin

Description

Inhibit

Main (+5 V) Output

Output Common

Positive Auxiliary Output

Negative Auxiliary Output

Case Ground

Sync In

Input Common

Positive Input

If Sync is not used, leave it unconnected.

IGURE

5: P

OTTOM

IEW

TANDARD

ICROCIRCUIT

RAWING

(SMD)

5962-9560101HXC
5962-9560201HXC

MHF+

IMILAR

ART

MHF+28512T/883
MHF+28515T/883

Dotted line outlines flanged package option.

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

BOTTOM VIEW

MHF+ Triple

For exact specifications for an SMD product, refer to the SMD drawing. SMDs
can be downloaded from
http://www.dscc.dla.mil/programs/smcr

Refer to Figures 13 - 16 for dimensions.

Flanged SMDs have the suffix HZC instead of HXC.

MHF+ SERIES TRIPLE
15 WATT

DC/DC C

ONVERTERS

Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.

IGURE

MHF+28512T TURN ON INTO FULL LOAD

MAIN

5 ms / div.

+5 VDC

2 V / div.

MHF+28515T has a similar response

10 V / div.

VIN

INPUT

GND

MHF+28512T TURN ON INTO FULL LOAD

AUXILIARIES

5 ms / div.

12 VDC

5 V / div.

+12 VDC

MHF+28515T has a similar response

10 V / div.

VIN

EFFICIENCY

16 V

28 V

48 V

MHF+28512T EFFICIENCY

OUTPUT POWER (W)

IGURE

EFFICIENCY

16 V

48 V

MHF+28515T EFFICIENCY

OUTPUT POWER (W)

28 V

IGURE

MHF+28512T TURN ON INTO FULL LOAD

MAIN

5 ms / div.

+5 VDC

2 V / div.

MHF+28515T has a similar response

10 V / div.

VIN

INPUT

GND

IGURE

MHF+28512T has a similar response

MHF+ 28515T STEP LINE RESPONSE

500 mV / div.

5 ms / div.

15 VDC

±15 = 250 mA EACH, +5 = 1.5 A

200 mV / div.

INPUT V: 16 TO 40 VDC,

+15 VDC

5 VDC

MAXIMUM OUTPUT POWER (W)

INPUT VOLTAGE

LOW LINE DROPOUT

MHF+28515T

MHF+28512T

11.5

10.5

9.5

8.5

IGURE

DC/DC C

ONVERTERS

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.

CASE E

BOTTOM VIEW

See Figure 14

for pin configurations.

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

1.460 max

(37.08)

1.130 max

(28.70)

Materials
Header Cold

Rolled

Steel/Nickel/Gold

Cover Kovar/Nickel
(SMHF

Series

Cold

Rolled

Steel/Nickel/Gold)

Pins

#52 alloy/Gold

compression glass seal

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.

IGURE

13: C

ASE

E M

AXIMUM

IMENSIONS

0.000

0.205

(5.21)

0.505

(12.83)

0.705

(17.91)

0.905

(22.99)

1.105

(28.07)

0.000

0.160

(4.06)

0.960

(24.38)

0.030 dia.
(0.76)

MHF+ Series Triple: Screening Standard, ES, or 883

BOTTOM VIEW CASE E2

0.330 max

(8.38)

0.000

0.25 (6.35)

0.330 max

(8.38)

0.000

0.25 (6.35)

Projection Weld

Seam Seal

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

IGURE

14: C

ASE

MHF+ SERIES TRIPLE
15 WATT

DC/DC C

ONVERTERS

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.

Materials
Header Cold Rolled Steel/Nickel/Gold
Cover MHF+ Series and FMH Filter

Kovar/Nickel

Pins

#52 alloy (all cases)

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 G

BOTTOM VIEW

Flanged package

See Figure 16

for pin configuration

2.005 max

(50.93)

1.130 max

(28.70)

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

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: 0.047 (1.19)

IGURE

15: C

ASE

G M

AXIMUM

IMENSIONS

1.590 (40.39)

0.128 dia

(3.25)

0.030 dia.
(0.76)

Flanged case: Designator (F) required in Case Option position of model number.
MHF+ Series Triple: Screening Standard, ES, or 883

BOTTOM VIEW CASE G2

0.000

0.205 (5.21)

0.505 (12.83)

0.705 (17.91)

0.905 (22.99)

1.105 (28.07)

0.000

0.160

(4.06)

0.960

(24.38)

0.140 (3.56)

0.560

(14.22)

0.330 max.

(8.38)

0.000

0.25 (6.35)

0.330 max.

(8.38)

0.000

0.25 (6.35)

Projection Weld

Seam Seal

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

IGURE

17: C

ASE

MHF+ SERIES TRIPLE

15 WATT

DC/DC C

ONVERTERS

MHF+ SERIES TRIPLE
15 WATT

TEST

STANDARD

/ES

/883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032

yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C

yes

Method 1010, Cond. B, -55°C to 125°C

yes

CONSTANT ACCELERATION

Method 2001, 3000 g

yes

Method 2001, 500 g

yes

BURN-IN

Method 1015, 160 hours at 125°C

yes

96 hours at 125°C case (typical)

yes

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C

yes

Subgroups 1 and 4: +25°C case

yes

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A

yes

Gross Leak, Method 1014, Cond. C

yes

Gross Leak, Dip (1 x 10

-3

)

yes

FINAL VISUAL INSPECTION

Method 2009

yes

Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

*883 products are built with element evaluated components and are 100% tested and guaranteed over the full military temperature

range of 55°C to +125°C.

ABLE

1: E

NVIRONMENTAL

CREENING

Contact Information:

www.interpoint.com

Interpoint Headquarters USA
Phone:

1-800-822-8782
+425-882-3100

Email:

power@intp.com

Interpoint UK
Phone:

+44-1252-815511

Email:

poweruk@intp.com

Interpoint France
Phone:

+33-134285455

Email:

powerfr@intp.com

21623-002-DTS Rev B 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. MHF+ Series is a trademark of Interpoint.
Copyright © 1995 - 1999 Interpoint. All rights reserved.

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MHF+28512T/883

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MHF+28512T/883