MHF2805S - Interpoint Corporation

MODELS

VDC OUTPUT

B2-77

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

See Section B8, case E1 for dimensions.

Weight: 21 grams typical.

Screening: Standard or ES.

See section C2 for screening options.

SINGLE

DUAL

±12

±15

DESCRIPTION

The MHF Series™ of DC/DC converters offer up to 12 watts of

power from single or dual outputs in a single package over a the full

military temperature range. Thick film hybrid manufacturing tech-

nology produces high levels of miniaturization, giving the MHF

Series converters a low profile (0.330 inch), small board area (1.65

square inches), and high power density (22 watt/in3).

The parts are packaged in hermetically sealed steel enclosures,

making them ideal for use in military, aerospace, and high reliability

industrial applications.

DESIGN METHODOLOGY

The MHF converters are switching regulators which use a quasi-

square wave, single ended forward converter design with a nominal

switching frequency of 600 kHz. Isolation between input and output

circuits is provided with a transformer in the forward power loop and

a temperature insensitive optical link in the feedback control loop.

Output regulation is accomplished with constant frequency pulse

width modulation. Both line and load regulation are typically within

10 mV.

On dual output models, the positive output is independently regu-

lated and the negative output is cross-regulated. Figures 7 and 8

illustrate what effects load changes have on the negative output.

Indefinite short circuit protection and overload protection are

provided by sensing output load current and restricting the output

current to approximately 125% of full load output current. Since the

output current is sensed in the secondary stage, the result is a

predictable, constant output current control with no foldback char-

acteristics. MHF converters are provided with internal filtering

elements on both the input and output to help reduce the need for

external components. For information about filtering to meet MIL-

STD-461’s CE03 test, contact your Interpoint representative.

WIDE VOLTAGE RANGE

The MHF Series is designed to provide full power operation over the

input voltage range of 16 to 40 volts. The 15 volt models provide a

19 to 40 volt range. Operation below 16 volts (or 19 volts for the 15

volt models), including operation in MIL-STD-704E emergency

power conditions, is possible with derated output power. Please

refer to the low line drop-out graphs, Figures 9 and 10.

MILITARY TEMPERATURE RANGE

The MHF Series provides full power operation at case temperatures

from –55°C up to +125°C. All 12 and 15 volt models in both single

and dual output configurations provide full power operation at

+125°C with derated power to 135°C. The +5 volt model provides

full power at 1 10°C derated to 0% at 130°C. Depending on operating

levels, air flow, and ambient temperature; heat sinking may be

required.

INHIBIT FEATURE

An inhibit terminal is provided that can be used to disable internal

switching, resulting in a very low quiescent input current. An open

collector TTLcompatible low (≤0.8V) is required to control the inhibit

function. This level may be supplied by an open collector gate since

the inhibit pin is provided with an internal pull-up resistor.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MHF SERIES

12 WATT

FEATURES

• –55° to +125°C operation

• 16 to 40 VDC input

(19 to 40 VDC for 15 volt outputs)

• Fully Isolated

• Optocoupler feedback

• Fixed frequency 600 kHz typical

• Forward converter topology

• 50 V for up to 50 ms transient protection

• Inhibit function

• Indefinite short circuit protection

• Up to 83% efficiency, 22 W/in3

ABSOLUTE MAXIMUM RATINGS TYPICAL CHARACTERISTICS

INHIBIT

RECOMMENDED OPERATING CONDITIONS

Input V olta ge

• 16 to 40 VDC (19 to 40 VDC 15 volt output)

Output Power

• 12 watts (10 watts MHF2805S)

Lead Soldering Temperature (10 sec per lead)

• 300°C

Storage Temperature Range (Case)

• –55°C to +135°C

B2-78

MHF SERIES

12 WATT DC/DC C

ONVERTERS

Output V olta ge T emperature Coefficient

• 150 ppm/°C, typical

Input to Output Capacitance

• 50 pF, typical

Current Limit

• 125% of full load, typical

Isolation

• 100 megohm minimum at 500 V

Conversion Frequency

• 600 kHz typical

Inhibit Pin Voltage (unit enabled)

• 8 to 11 V

Input V olta ge Range

• 16 to 40 VDC continuous

• 19 to 40 VDC 15 volt outputs continuous

• 50 V for 50 msec transient

Case Operating Temperature (Tc)

• –55°C to +125°C full power

• –55°C to +110°C full power for MHF2805S

• –55°C to +135°C absolute

• –55°C to +130°C absolute for MHF2805S

Derating Output Power/Current

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

• Linearly from 100% at 110°C to 0% at 130°C

for MHF2805S

Inhibit TTL Open Collector

• Logic low (output disabled)

Logic low 0.8 V max

Inhibit pin current 4 mA max

• 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 MODELS MHF2805S MHF2812S MHF2815S

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

OUTPUT VOLTAGE 4.95 5.0 5.05 11.88 12 12.12 14.85 15 15.15 VDC

OUTPUT CURRENT — — 2.0 — — 1.0 — — 0.8 A

OUTPUT POWER MIN. TO MAX. VIN — — 10 — — 12 — — 12 W

OUTPUT RIPPLE 10 kHz to 2 MHz — 40 60 — 30 60 — 25 50 mV p-p

LINE REGULATION MIN. TO MAX. VIN — 10 50 — 10 50 — 10 50 mV

LOAD REGULATION NO LOAD TO FULL — 10 50 — 10 50 — 10 50 mV

INPUT VOLTAGE CONTINUOUS 16 28 40 16 28 40 19 28 40 VDC

TRANSIENT 50 ms — — 50 — — 50 — — 50 V

INPUT CURRENT NO LOAD — 20 30 — 20 30 — 20 30

FULL LOAD — — 483 — — 557 — — 535 mA

INHIBITED — 2 3 — 2 3 — 2 3

INPUT RIPPLE

CURRENT 10 kHz TO 2 MHz — 135 180 — 150 200 — 150 220 mA p-p

EFFICIENCY 74 77 — 77 81 — 80 83 — %

LOAD FAULT1POWER DISSIPATION

OVERLOAD — — 5 — — 5 — — 5 W

SHORT CIRCUIT — – 3.5 — — 2.8 — — 2

START-UP DELAY — 180 300 — 80 200 — 150 250 ms

Notes

1. Indefinite short circuit protection not guaranteed above 125°C case temperature (110°C case for MHF2805S).

PIN OUT

Pin Single Output Dual Output

1 Inhibit Inhibit

2 No connection Positive Output

3 Output Common Output Common

4 Positive Output Negative Output

5 No connection No connection

6 Case Ground Case Ground

7 Input Common Input Common

8 Positive Input Positive Input

BOTTOM VIEW

MHF

Squared corner and dot on

top of cover indicate pin one.

1 2345

876

B2-79

MHF SERIES

12 WATT

DC/DC C

ONVERTERS

DUAL OUTPUT MODELS MHF2812D MHF2815D

PARAMETER CONDITION MIN TYP MAX MIN TYP MAX UNITS

OUTPUT VOLTAGE +VOUT 11.88 12.0 12.12 14.85 15.0 15.15 VDC

– VOUT 11.82 12.0 12.18 14.77 15.0 15.23

OUTPUT CURRENT1, 2 — 0.5 1.0 — 0.4 0.8 A

OUTPUT POWER2+VOUT — — 10.8 — — 10.8

– VOUT — — 10.8 — — 10.8 W

TOTAL — — 12 — — 12

OUTPUT RIPPLE

VOLTAGE 10 kHz TO 2 MHz — 30 60 — 30 60 mV p-p

LINE REGULATION

MIN. TO MAX. VIN +VOUT — 5 50 — 5 50 mV

LOAD REGULATION

NO LOAD TO FULL +VOUT — 5 50 — 10 50 mV

CROSS REGULATION 20% TO 80% LOAD3— 5 10 — 4 8 %

50% LOAD4—45—35

INPUT VOLTAGE CONTINUOUS 16 28 40 19 28 40 VDC

NO LOAD TO FULL TRANSIENT 50 ms — — 50 — — 50 V

INPUT CURRENT NO LOAD — 25 35 — 25 35

FULL LOAD — — 550 — — 536 mA

INHIBITED — 1.9 3 — 1.9 3

INPUT RIPPLE

CURRENT 10 kHz TO 2 MHz — 175 240 — 175 240 mA p-p

EFFICIENCY 78 81 — 80 83 — %

LOAD FAULT5POWER DISSIPATION

SHORT CIRCUIT — — 2.8 — — 2 W

OVERLOAD — — 5 — — 5

START-UP DELAY — 150 250 — 150 250 ms

Notes

1. Applies to both outputs.

2. Maximum combined output power is 12 watts. A maximum of 90% is avail-

able from either output.

3. 20% to 80% load on the positive output and 80% to 20% on the negative

output. See Figure 8.

4. 50% load on the positive output and 50% to 20% load on the negative output.

50% load on the negative output and 50% to 20% load on the positive output.

See Figure 7.

5. Indefinite short circuit protection not guaranteed above 125°C case temper-

ature.

MODEL NUMBER KEY

MHF 28 12 D / ES

Base Model

Input Voltage

Output Voltage

Number of Outputs

(S = single, D = dual)

Screening

(Standard screening has no designator

in this position.)

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

FIGURE 1: PIN OUT

See Section B8, case E1, for dimensions.

B2-80

MHF SERIES

12 WATT DC/DC C

ONVERTERS

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

FIGURE 5FIGURE 7

Output Power (Watts)

MHF2812D Efficiency

Efficiency (%)

2 4 6 8 10 12

16V

40V

28V

14 Output Load (%)

Condition A: 50% Load Pos. Vout, 50% to 20% Neg. Vout

Condition B: 50% Load Neg. Vout, 50% to 20% Pos. Vout

MHF Negative Output Voltage

Cross Regulation

Negative Output Voltage Change (%)

–1001023040

–6

–4

–8

2812D Cond. B

Cond. A

2812D

22815D

Output Power (Watts)

MHF2805S Efficiency

Efficiency (%)

24681012

28V

40V

16V

FIGURE 2

Output Power (Watts)

MHF2812S Efficiency

Efficiency (%)

2468

10 12

16V

40V

28V

FIGURE 3

Output Power (Watts)

MHF2815D Efficiency

Efficiency (%)

2 4 6 8 10 12

19V

40V

28V

FIGURE 6

FIGURE 4

Output Power (Watts)

MHF2815S Efficiency

Efficiency (%)

2 4 6 8 10 12

19V

40V

28V

Output Load (%)

Positive Output 20% to 80% Load

Negative Output 80% to 20% Load

MHF Dual Negative Output Voltage

Cross Regulation

Negative Output Voltage Change (%)

–200 20406080

100

–10

–5

–15

2812D

2815D

FIGURE 8

Output Power (Watts)

50 mV Drop

MHF Single Low Line Dropout

Input Voltage (Volts)

1124681012

2812S

2815S

2805S

FIGURE 9FIGURE 10

Output Power (Watts)

50 mV Drop

MHF Dual Low Line Dropout

Input Voltage (Volts)

1124681012

2812D

2815D

218211-001-DTS Rev A DQ# 1011

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.

B8-10

CASE E C

ASES

CASE E

BOTTOM VIEW

See Figures 16 – 18

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.

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)

1 2345

0.030 dia.

(0.76)

876

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

MHF Series and LIM5050 Module: Screening – Standard or ES

SMHF Series Single and Dual and SLIM5050 Module:

Screening – Space Standard, H, or K

HR120 Series: No screening options

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.

FIGURE 16: CASE E1

FIGURE 15: CASE E MAXIMUM DIMENSIONS

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.

C2-10

TEST (125°C Products) STANDARD /ES /883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032 yes yes yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C no no yes

Method 1010, Cond. B, -55°C to 125°C no yes no

CONSTANT ACCELERATION

Method 2001, 3000 g no no yes

Method 2001, 500 g no yes no

BURN-IN

Method 1015, 160 hours at 125°C no no yes

96 hours at 125°C case (typical) no yes no

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C no no yes

Subgroups 1 and 4: +25°C case yes yes no

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A no yes yes

Gross Leak, Method 1014, Cond. C no yes yes

Gross Leak, Dip (1 x 10-3) yes no no

FINAL VISUAL INSPECTION

Method 2009 yes yes 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.

MOR Series

MFLHP Series

MFL Series

MHP Series

MTR Series

MQO Series**

MHD Series

MHV Series

MHF+ Series

MHF Series**

MGA Series

MSA Series

MGH Series

MCH Series

FM-704A EMI Filter

FMD**/FME EMI Filter

FMC EMI Filter

FMH EMI Filter

FMGA EMI Filter

FMSA EMI Filter

HUM Modules**

LCM Modules**

LIM Modules

QA SCREENING

125°C PRODUCTS

125°C P

RODUCTS

Applies to the following products

**MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer

‘883” screening.