Size (max.): Non flanged Single and dual output models, case H2, 2.125 x 1.125 x 0.400 inches (53.98 x 28.58 x 10.16 mm)

Triple output models, case F1, 1.950 x 1.350 x 0.405 inches (49.53 x 34.29 x 10.29 mm)
Flanged Single and dual output models, case K3, 2.910 x 1.125 x 0.400 inches (73.91 x 28.58 x 10.16 mm)
Triple output models, case J1, 2.720 x 1.350 x 0.405 inches (69.09 x 34.29 x 10.29 mm)
See Section B8, cases H2, F1, K3, and J1 for dimensions.

Weight:

60 grams maximum.

Screening: Standard, ES, or 883 (Class H). See Section C2 for

screening options, see Section A5 for ordering information.

DESCRIPTION

Interpoint's MHV SeriesTM of DC/DC converters offer a wide input
voltage range of 16 to 50 VDC and a choice of nine different output
voltage configurations comprised of single, dual or triple outputs.
The converters will withstand transients of up to 80 V for up to 120
milliseconds while maintaining output voltages (with the exception of
the 12 volt single and dual outputs which will withstand transients up
to 75 volts and the 15 volt single and dual outputs which will with-
stand up to 60 volts). The MHV Series operates at a full 15 watts of
output power (10 watts for the 3.3 volt single output) over the mili-
tary temperature range of 55°C to +125°C while maintaining low
input and output noise.

ONVERTER

ESIGN

MHV Series DC/DC converters are switching regulators that use
continuous flyback conversion topology with a clock frequency of
approximately 600 kHz. MHV Series converters incorporate two
internal converters with one converter phase shifted 180° from the
other to create a dual phase/phase-shifted operation. Each of the
internal converters operates at approximately one-half of the clock
frequency. This proprietary technology eliminates cross regulation,
minimizes input ripple, greatly reduces output ripple and improves
efficiency. On the triple output models, this design provides
completely independent regulation with no cross regulation effect
between the main and auxiliary outputs and no minimum loading
required on the main output.

NHIBIT

UNCTION

Open collector TTL levels control the inhibit circuit. The converter is
enabled when the inhibit terminal is left unconnected or when the
inhibit terminal is connected to a voltage between 11.5 and 50 V.

When a low (0.8 V) is applied to the inhibit terminal the converter
shuts down, typically drawing 8.4 mA of input current. Inhibit
terminal resistance is 3.3 k ohms and draws 8.4 mA, typical.

YNCHRONIZATION

UNCTION

Applying an external signal of 40% to 60% duty cycle and 500 to
700 kHz will synchronize the converter to your system requirements.
Free run clock frequency is approximately 600 kHz. If not used, the
sync terminal must be left unconnected.

RIM

Single output converters feature a trim range of as low as 80% to
as high as 110% of Vout nominal, depending on the model. To trim
up, connect a resistor from output common (pin 4) to the trim
terminal (pin 3). To trim down, connect a resistor from the positive
output (pin 5) to the trim terminal (pin 3). See Figure 4 and trim
tables for more information.

NDERVOLTAGE

OCKOUT

An undervoltage lockout of approximately 7 VDC keeps system
current levels low during startup.

HORT

IRCUIT

ROTECTION

Under short circuit conditions of 130% or more of full load current,
the converter will protect itself by shutting down. Short circuit dura-
tion should be brief because power dissipation may cause internal
temperatures to rise rapidly. Restart is automatic upon removal of
the short circuit.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MHV SERIES

15 WATT

EATURES

· 55° to +125°C operation
· 16 to 50 VDC input
· Fully Isolated
· Optocoupler feedback
· Fixed switching frequency

600 kHz typical,

· Topology

Dual Single Ended Flybacks

· 80 V / 120 ms transient protection

(12 Vout single and dual to 75 V,
15 Vout single and dual to 60V)

· Inhibit and sync functions
· Trim on single output models
· Up to 84% efficiency
· Low output noise

MODELS

VDC O

UTPUT

SINGLE

3.3

12
15

DUAL

±5

±12
±15

TRIPLE

+5 & ±12
+5 & ±15

TYPICAL CHARACTERISTICS

SYNC AND INHIBIT

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

Input Voltage

· 16 to 50 VDC

Output Power

· 15 watts (10 watts MHV283R3S)

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 65°C to +150°C

MHV SERIES
15 WATT

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 100 ppm/°C typical

Undervoltage Lockout

· 7 V input typical

Current Limit

· 130% of full load typical at 25°C

Isolation

· 100 megohm minimum at 500 V

Audio Rejection

· 30 dB typical

Conversion (Switching) Frequency

· Free run mode 300 kHz

typical 245 kHz. min, 355 kHz. max

Clock Frequency

· External sync range 500 to 700 kHz.

Inhibit Pin Voltage (unit enabled)

· 11 V typical

Input Voltage Range

· 16 to 50 VDC continuous
· Transient: see Electrical Characteristics tables

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 55°C to +130°C absolute

Derating Output Power/Current

· Linearly from 100% at 125°C to 0% at 130°C

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

Sync In (500 to 700 kHz)

· Duty cycle 40% min, 60% max
· Logic low 0.8 V max
· Logic high 4.5 V min, 10 V max
· Referenced to input common
· If not used, leave unconnected

Inhibit TTL Open Collector

· Logic low (output disabled)

Logic low voltage

0.8 V

Inhibit pin current

8.4 mA typical, 10 mA maximum

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

Open collector
Unconnected or 11.5 to 50 V

SINGLE OUTPUT MODELS

MHV283R3S

MHV2805S

MHV2812S

MHV2815S

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

3.27

3.30

3.33

4.95

5.00

5.05

11.88

12.00 12.12

14.85 15.00

15.15

VDC

OUTPUT CURRENT

= 16 to 50 VDC

3.03

3.0

1.25

1.0

OUTPUT POWER

= 16 to 50 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

VOLTAGE

Tc = 55°C to +125°C

mV p-p

LINE REGULATION

= 16 to 50 VDC

LOAD REGULATION

NO LOAD TO FULL

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

FULL LOAD

489

518

687

724

638

678

638

687

INHIBITED

8.4

INPUT RIPPLE

10 kHz - 20 MHz

CURRENT

Tc = 55°C to +125°C

mA pp

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

SHORT CIRCUIT

9.5

10.5

RECOVERY

OUTPUT CURRENT

TRIP POINT

3.97

3.93

1.64

1.31

STEP LOAD

50% 100% 50%

RESPONSE

TRANSIENT

250

300

350

mV pk

RECOVERY

700

1500

900

700

µs

START-UP

DELAY

0 TO 28 V

OVERSHOOT

100

120

150

mV pk

Notes
1. Lin = 5.5 µH.
2. Load fault is a short circuit (<50 m

). Recovery is into a resistive load.

3. Load step transition

10 µs. Recovery = time to settle to within 1% of Vout final value.

4. Input step transition

10 µs. Recovery = time to settle to within 1% of Vout final value.

MHV SERIES

15 WATT

DC/DC C

ONVERTERS

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

DUAL OUTPUT MODELS

MHV2805D

MHV2812D

MHV2815D

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

= 16 TO 50 VDC

±1.50

±0.625

±0.500

OUTPUT POWER

= 16 TO 50 VDC

±7.5

OUTPUT RIPPLE

10 kHz- 2 MHz

VOLTAGE

Tc = 55°C to +125°C

OUT

/ V

OUT

120

mVp-p

LINE REGULATION

= 16 TO 50 VDC ±V

OUT

LOAD REGULATION

NO LOAD TO FULL ±V

OUT

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 120 msec

INPUT CURRENT

NO LOAD

FULL LOAD

670

705

634

670

635

670

INHIBITED --

8.4

INPUT RIPPLE

10 kHz - 20 MHz

CURRENT

Tc = 55°C to +125°C

200

mA p-p

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

SHORT CIRCUIT

RECOVERY

OUTPUT CURRENT

TRIP POINT

1.97

0.819

0.655

STEP LOAD

50% 100% -- 50%

RESPONSE

± V

OUT

TRANSIENT

200

300

400

mV pk

RECOVERY

500

700

900

µs

START-UP

DELAY

0 TO 28 V

OVERSHOOT

120

150

mV pk

Notes
1. Up to 7.5 watts is available from either output.
2. Lin = 2 µH.
3. Load fault is a short circuit (<50 m

). Recovery is into a resistive load.

4. Load step transition

10 µs. Recovery = time to settle to within 1% of Vout final value.

5. Input step transition

10 µs. Recovery = time to settle to within 1% of Vout final value.

MHV SERIES
15 WATT

DC/DC C

ONVERTERS

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

TRIPLE OUTPUT MODELS

MHV28512T

MHV28515T

PARAMETER

CONDITION

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

MAIN

4.95

5.0

5.05

4.95

5.0

5.05

+ AUXILIARY

11.88

12.0

12.12

14.85

15.0

15.15

VDC

AUXILIARY

11.82

12.0

12.18

14.77

15.0

15.23

OUTPUT CURRENT

MAIN

2.0

= 16 TO 50

+ AUXILIARY

0.333

0.267

AUXILIARY

0.333

0.267

TOTAL

2.416

2.333

OUTPUT POWER

MAIN

= 16 TO 50

+ AUXILIARY

AUXILIARY

TOTAL

OUTPUT RIPPLE

10 kHz to 2 MHz MAIN

VOLTAGE

10 kHz to 2 MHz ± AUXILIARY

mV p-p

LINE REGULATION

MAIN

= MIN. TO MAX.

+AUXILIARY

AUXILIARY

LOAD REGULATION

MAIN

+AUXILIARY

AUXILIARY

CROSS REGULATION

CONDITION A

300

500

300

500

AUXILIARY

CONDITION B

400

700

400

700

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

FULL LOAD

670

705

670

705

INHIBITED

8.4

INPUT RIPPLE CURRENT

10 kHz to 10 MHz

mA p-p

EFFICIENCY

LOAD FAULT

SHORT CIRCUIT

POWER DISSIPATION

MAIN

± AUXILIARY

STEP LOAD RESPONSE

5, 6

TRANSIENT

MAIN

250

± AUXILIARY

500

RECOVERY

MAIN

2.5

± AUXILIARY

3.5

START-UP

0 TO 28 V

DELAY EACH OUTPUT

Notes
1. The sum of the 12 volt auxiliary output currents may not exceed 416 mA.

The sum of the 15 volt auxiliary output currents may not exceed 333 mA.

2. The sum of the auxiliary output power may not exceed 5 watts.
3. Cross regulation occurs between the two auxiliaries and is measured on aux.

+5 is held constant at 2.0 A. Cross regulation is specified for two conditions:
A. Positive aux. = 2.5 W; negative aux. = 2.5 W to 0.5 W.
B. Negative aux. = 4 W to 1 W; positive aux. = 1 W to 4 W, simultaneous.

4. Load fault is a short circuit (<50 m

). Recovery is into a resistive load.

5. Load step transition

10 µs. Recovery = time to settle to within 1% of Vout

final value.

6. Input step transition

10 µs. Recovery = time to settle to within 1% of Vout

final value.

7. Lin = 5.5 µH.

TRIM SINGLE OUTPUT MODELS ONLY

Formula Values by Model

3.3V

12V

15V

3.7

18.2

Positive

Input

180

Input

Common

Sync.

Positive
Output,
Main (+5)

Output
Common

Positive
Output,
Auxiliary

Negative
Output,
Auxiliary

Feedback Isolator

PWM CM
Controller

Trim down: R

) =

(

2.5)

)

A B

o nominal

Trim up:

) =

(

2.5A

)

o nominal

= desired output voltage

Positive Input

Input Common

MHV

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

6, 7, 8

Positive Input

28V

Input Common

FMC-461

or FMH-461

EMI FILTER

Positive Output

Output Common

ODEL

% V

OUT

OMINAL

110

106

102

MHV283R3S

128

n/a

MHV2805S

n/a

MHV2812S

n/a

116

177

MHV2815S

0.3

122

255

104

MHV SERIES

15 WATT

DC/DC C

ONVERTERS

DIAGRAMS

IGURE

1: MHV T

RIPLE

LOCK

IAGRAM

IGURE

3: EMI F

ILTER

ONNECTION

Positive Input

28V

Sync In

Inhibit (pin 8 on triple
output models)

Input Common

MHV

IGURE

4: MHV S

INGLE

UTPUT

RIM

Notes
If calculated result is a negative value, the desired output voltage is outside the allowed trim range.
Calculated values of R

are ±15%.

When trimming up, do not exceed the maximum output power.
When trimming down, do not exceed the maximum output current.

Calculated Trim

Quick Reference Trim Table

TRIM (

) k ohms

TRIM

OUTPUT

COMMON

MHV

SINGLE

OUTPUT

TRIM DOWN

TRIM UP

IGURE

2: T

YPICAL

ONNECTIONS

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MHV2815S