FEATURES

55 to +125C 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/in3

DC/DC CONVERTERS 28 VOLT INPUT

MHF+ SERIES SINGLE & DUAL 15 WATT

MODELS
VDC OUTPUT SINGLE DUAL 3.3 5 5 12 5.2 15 12 15 28

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+ Series 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 transients up to 50 volts. The package is a hermetically sealed, welded metal case. Flanged and non-flanged models are available.

INHIBIT FUNCTION
MHF+ converters provide an inhibit terminal that can be used to disable internal switching, resulting in no output and very low quiescent 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.

CONVERTER DESIGN
The MHF+ converters are switching regulators that use a quasisquare 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 maintained 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.

SYNCHRONIZATION
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.

HIGHER POWER DENSITY

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 footprint of 1.7 in2, this low profile package offers a total power density of up to 28 watts per cubic inch.

SHORT CIRCUIT PROTECTION

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.

LOW NOISE, HIGH AUDIO REJECTION

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 .

UNDERVOLTAGE LOCKOUT
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.

MHF+ SERIES SINGLE AND DUAL 15 WATT

DC/DC CONVERTERS
SYNC AND INHIBIT
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

ABSOLUTE MAXIMUM RATINGS

Input Voltage 16 to 40 VDC Power Dissipation (Pd) 6W Output Power 12 to 15 watts depending on model Lead Soldering Temperature (10 sec per lead) 300C Storage Temperature Range (Case) 65C to +150C

TYPICAL CHARACTERISTICS
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 (55C to +125C Tc) Free run 550 kHz typical 480 kHz min, 620 kHz max Inhibit Pin Voltage (unit enabled) 8.5 to 12 V

RECOMMENDED OPERATING CONDITIONS

Input Voltage Range 16 to 40 VDC continuous 50 V for up to 50 msec transient Case Operating Temperature (Tc) 55C to +125C full power 55C to +135C absolute Derating Output Power/Current (Tc) Linearly from 100% at 125C to 0% at 135C

Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT CONDITION VIN = 16 to 40 VDC VIN = 16 to 40 VDC 10 kHz - 2 MHz Tc = 55C to +125C Vin = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = 55C to +125C SHORT CIRCUIT POWER DISSIPATION RECOVERY2 50% 100% 50% TRANSIENT RECOVERY2 16 40 16 VDC TRANSIENT3 RECOVERY2 DELAY OVERSHOOT4 MHF+283R3S MIN 3.27 0 0 16 72 400 800 TYP MAX 3.30 3.33 2.4 30 50 5 20 28 25 5 45 75 5 7.5 150 150 550 0.8 10 200 8 80 120 100 50 40 50 65 397 12 80 120 8 30 500 300 800 1.2 25 300 MHF+2805S MIN 4.95 0 0 16 75 400 800 TYP MAX 5.00 5.05 2.4 30 60 5 20 28 25 560 5 35 77 3.5 7.5 150 150 550 0.8 10 100 12 80 100 50 50 40 50 40 624 12 80 100 6 30 400 300 800 1.2 25 600 MHF+285R2S MIN 5.16 0 0 16 75 400 800 TYP MAX 5.20 5.24 2.4 30 60 5 20 28 25 560 5 35 77 3.5 7.5 150 150 550 0.8 10 100 12.48 50 100 35 35 40 50 42 605 12 100 100 6 30 400 300 800 1.2 25 600 UNITS VDC A W mV p-p mV mV VDC V mA

INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1

mA pp % W ms mV pk s mV pk ms ms mV pk

STEP LOAD RESP.

STEP LINE RESP.

START-UP

Notes 1. Indefinite short circuit protection not guaranteed above 125C (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 s. 4. Input step transition time <100 s.

DC/DC CONVERTERS

MHF+ SERIES SINGLE AND DUAL 15 WATT

MHF+2828S MIN TYP MAX 27.72 28.00 28.28 0 0.54 0 16 82 800 60 100 50 50 28 25 640 5 35 84 3.5 7.5 600 200 15 120 180 150 150 40 50 60 760 12 80 120 6 30 800 400 UNITS VDC A W mV p-p mV mV VDC V mA

Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT CONDITION VIN = 16 to 40 VDC VIN = 16 to 40 VDC 10 kHz - 2 MHz Tc = 55C to +125C Vin = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = 55C to +125C SHORT CIRCUIT POWER DISSIPATION RECOVERY2 50% 100% 50% TRANSIENT RECOVERY2 16 40 40 VDC TRANSIENT3 RECOVERY2 DELAY OVERSHOOT4 MHF+2812S MIN TYP MAX 11.88 12.00 12.12 0 1.25 0 16 78 500 800 0 0 30 50 5 20 28 25 680 5 35 79 3.5 7.5 150 150 550 0.8 10 15 80 120 50 50 40 50 50 752 12 80 120 6 30 500 300 800 1.2 25 MHF+2815S MIN TYP MAX 14.85 15.00 15.15 0 1.00 0 16 78 600 800 0 0 30 50 5 20 28 25 670 5 35 80 3.5 7.5 200 150 550 0.8 10 15 80 120 50 50 40 50 62 752 12 80 120 6 30 600 300 800 1.2 25

INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1

mA pp % W ms mV pk s mV pk ms ms mV pk

STEP LOAD RESP.

STEP LINE RESP.

1200 1100 1200 0.8 1.2 0 0 10 200 25 280

START-UP

200 1200

200 1500

Notes 1. Indefinite short circuit protection not guaranteed above 125C (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 s. 4. Input step transition time <100 s.

MHF+ SERIES SINGLE AND DUAL 15 WATT

DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE CONDITIONS +VOUT VOUT OUTPUT CURRENT1 OUTPUT POWER1 OUTPUT RIPPLE VOLTAGE VOUT LINE REGULATION Vin = 16 to 40 VDC LOAD REGULATION VIN = 16 to 40 VDC VIN = 16 to 40 VDC 10 kHz - 2 MHz Tc = 55C to +125C BALANCED +VOUT LOAD VOUT VOUT BALANCED +VOUT LOAD CROSS REGULATION2 INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT

DC/DC CONVERTERS
MHF+2805D MIN 4.95 4.92 16 77 600 600 800 0 TYP 5.00 5.00 1.2 30 60 5 20 6 28 20 540 6 20 40 79 3 7.5 200 150 150 600 0.8 12 100 MAX 5.05 5.08 1.92 12 80 120 50 80 50 100 7.5 40 50 40 600 12 50 80 6 30 600 600 500 800 1.2 20 250 MIN 11.88 11.82 16 76 600 600 750 0 MHF+2812D TYP 12.00 12.00 0.625 30 60 5 20 3 28 25 645 5 35 50 83 3 7.5 300 100 200 550 0.8 12 200 MAX 12.12 1218 1.125 15 80 120 50 100 50 100 6 40 50 50 754 12 60 100 6 50 600 500 400 750 1.2 25 750 MIN 14.85 14.78 16 76 600 600 750 0 MHF+2815D TYP 15.00 15.00 0.500 30 50 5 20 3 28 25 638 5 35 50 84 3 7.5 300 100 200 550 0.8 12 200 MAX 15.15 15.23 0.900 15 80 120 50 100 50 100 6 40 50 50 754 12 60 100 6 50 600 600 500 750 1.2 25 750 s mV pk ms ms mV pk % VDC V mA mV A W mV p-p mV UNITS VDC

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

NEGATIVE VOUT CONTINUOUS TRANSIENT 50 msec NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = 55C to +125C SHORT CIRCUIT3 POWER DISSIPATION RECOVERY4 50% 100% 50% +VOUT TRANSIENT VOUT RECOVERY4 16 40 40 VDC TRANSIENT6 RECOVERY4 DELAY OVERSHOOT7

INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT

mA p-p % W ms

STEP LOAD RESP.5 BALANCED LOADS

mV pk

STEP LINE RESP. VOUT START-UP

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 125C (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 s. 7. Input step transition time <100 s.

DC/DC CONVERTERS

MHF+ SERIES SINGLE AND DUAL 15 WATT

BLOCK DIAGRAM

5 H
Positive Input

2 F

Positive Output

Inhibit

PWM Controller IC

ID Limit Ref.

Input Common

Output Common

FIGURE 1: MHF+ SINGLE OUTPUT

MHF+ SERIES SINGLE AND DUAL 15 WATT

Pin 1 2 3 4 52 6 7 8

DC/DC CONVERTERS
PIN OUT Single Output (Except MHF+2828S) Inhibit No connection Output Common Positive Output Sync Case Ground Input Common Positive Input MHF+2828S Inhibit Positive Output (See note 1, below) Output Common Sync Case Ground Input Common Positive Input Dual Output Inhibit Positive Output Output Common Negative Output 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.

Dot on top of cover indicates pin one.

BOTTOM VIEW MHF+ SINGLE AND DUAL NON-FLANGED OR FLANGED

8 7 6

Dotted line outlines flanged package option.

See pages 9 and 10 for dimensions.

FIGURE 2: PIN OUT

SMD NUMBERS MODEL NUMBERING KEY

MHF+ 28 12 D Base Model Input Voltage Output Voltage (R = decimal point, 3R3 = 3.3 Vout) Number of Outputs (S = single, D = dual) Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position.) F / 883

STANDARD MICROCIRCUIT DRAWING (SMD) IN PROCESS 5962-9213901HXC IN PROCESS 5962-9166401HXC 5962-9160101HXC 5962-9689801HXC 5962-9555901HXC 5962-9214401HXC 5962-9161401HXC

MHF+ SIMILAR PART 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

Flanged SMDs have the suffix HZC instead of HXC. 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

DC/DC CONVERTERS
90 90 16V 80 80 90

MHF+ SERIES SINGLE AND DUAL 15 WATT

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

80

16V

16V

EFFICIENCY (%)

EFFICIENCY (%)

70 40V 28V 60

70 40V 60

EFFICIENCY (%)

28V

70 40V 60 28V

50

50

50

40

10

12

40

10

12

14 15

40

10

12

14 15

OUTPUT POWER (Watts)

MHF+2805S EFFICIENCY

OUTPUT POWER (Watts)

OUTPUT POWER (Watts)

MHF+2812S EFFICIENCY

MHF+2815S EFFICIENCY

FIGURE 3

FIGURE 4

FIGURE 5

90 16V 80

90 16V 80

90 16V 80

EFFICIENCY (%)

EFFICIENCY (%)

EFFICIENCY (%)

70 40V 60 28V

70 40V 60 28V 50

70 40V 60 28V 50

50

40

40 2 4 6 8 10 12

40 2 4 6 8 10 12 14 15

10

12

14

OUTPUT POWER (Watts)

OUTPUT POWER (Watts)

OUTPUT POWER (Watts)

MHF+2805D EFFICIENCY

MHF+2812D EFFICIENCY

MHF+2815D EFFICIENCY

FIGURE 6

FIGURE 7

FIGURE 8

0 10

ATTENUATION (dB)

500mV/div.

20 30 40 50 60 70 80 90 100 0.1 1 10 100

VOUT

100% to 50%

100mV/div.

50% to 100%

20V/div.

VIN

FREQUENCY (kHz)

1ms/div 16V TO 40V

MHF+ SERIES AUDIO REJECTION

MHF+2805S STEP LINE RESPONSE

50s/div 50% 100%

MHF+2805S STEP LOAD RESPONSE

FIGURE 9

FIGURE 10

FIGURE 11

MHF+ SERIES SINGLE AND DUAL 15 WATT

DC/DC CONVERTERS

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

20V/div.

100% to 10%

100mV/div.

200mV/div. 20V/div.
POUT= 12W

VIN

+VOUT

10% to 100%

1V/div.

VOUT

VIN

200s/div 10% 100%

2 ms/div

1 ms/div 16V TO 40V

MHF+2805S STEP LOAD RESPONSE

MHF+2805S TURN-ON INTO FULL LOAD

MHF+2815D STEP LINE RESPONSE

FIGURE 12

FIGURE 13

FIGURE 14

100% to 50%

PO= 7.5 W

PO= 7.5 W VOUT 100% to 20%

100mV/div.

100mV/div.

5V/div.

+VOUT

20% to 100%

20V/div.
50s/div 20% 100% MHF+2815D +VOUT STEP LOAD RESPONSE

50% to 100%

VIN

50s/div 50% 100% MHF+2815D +VOUT STEP LOAD RESPONSE

2 ms/div

MHF+2815D TURN-ON INTO FULL LOAD

FIGURE 15

FIGURE 16

FIGURE 17

10

VOUT VOLTAGE CHANGE (%)

10

8 6

2805D 2812D COND A

16 MHF+2805S&D

V OUT VOLTAGE CHANGE (%)

5 2812D 2815D 0

INPUT VOLTAGE (Volts)

4 2 0 2 4 6 8 10 20

15

2815D COND B 2812D 2805D 30 40 50

14

5 2805D

13

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

10

20

40

60

80

100

10

12 10

11

12

13

14

15

POSITIVE OUTPUT LOAD (% OF TOTAL LOAD) VOUT WITH SHIFT IN LOAD BALANCE

CROSS REGULATION

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

OUTPUT POWER (Watts) 50 mV DROP

LOW LINE DROPOUT VS. LOAD

MHF+2805D/MHF+2812D/MHF+2815D CROSS REGULATION

FIGURE 18

FIGURE 19

FIGURE 20

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

MHF+ SERIES SINGLE AND DUAL 15 WATT

CASE E BOTTOM VIEW See Figure 22 for pin configurations.

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 300C for 10 seconds per pin.

1.460 max (37.08)

FIGURE 21: CASE E MAXIMUM DIMENSIONS

BOTTOM VIEW CASE E1 MHF+ Series Single and Dual: Screening Standard, ES, or 883
Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one.
0.960 (24.38) 0.030 dia. (0.76)

0.160 (4.06) 0.000 0.000 0.000 0.000 0.330 max (8.38) 0.25 (6.35) 0.330 max (8.38) 0.25 (6.35)

0.205 (5.21)

FIGURE 22: CASE E1

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.

0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07)

MHF+ SERIES SINGLE AND DUAL 15 WATT

DC/DC CONVERTERS
Materials Header Cold Rolled Steel/Nickel/Gold Cover MHF+ Series and FMH Filter Kovar/Nickel SMHF Cold Rolled Steel/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 CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C for 10 seconds per pin.

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

CASE G BOTTOM VIEW Flanged package See Figure 24 for pin configuration

1.130 max (28.70)

2.005 max (50.93)

Flange Thickness: 0.047 (1.19)

FIGURE 23: CASE G MAXIMUM DIMENSIONS

10

DC/DC CONVERTERS
BOTTOM VIEW CASE G1

MHF+ SERIES SINGLE AND DUAL 15 WATT

Flanged cases: Designator "F" required in Case Option position of model number MHF+ Series Single and Dual: Screening Standard, ES, or 883
Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one.
0.960 (24.38) 0.030 dia. (0.76)

5 0.128 dia (3.25)

0.560 (14.22) 8 7 6

0.160 (4.06) 0.000 0.000 0.000 0.330 max. (8.38) 0.330 max. (8.38) 0.25 (6.35) 0.25 (6.35) 0.140 (3.56) 0.000

0.205 (5.21)

0.505 (12.83)

0.705 (17.91)

0.905 (22.99)

FIGURE 24: CASE G1

1.105 (28.07)

1.590 (40.39)

11

MHF+ SERIES SINGLE AND DUAL 15 WATT

TEST PRE-CAP INSPECTION Method 2017, 2032 TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65C to 150C Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g BURN-IN Method 1015, 160 hours at 125C 96 hours at 125C case (typical)

DC/DC CONVERTERS
TABLE 1: ENVIRONMENTAL SCREENING

STANDARD

/ES

/883 (Class H)*

yes

yes

yes

no no

no yes

yes no

no no

no yes

yes no

no no

no yes

yes no

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55C, +25C, +125C Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes yes no no yes yes yes no yes yes no no yes no yes yes no

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 55C to +125C.

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

12

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.

FEATURES
55 to +125C 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

DC/DC CONVERTERS 28 VOLT INPUT

MHF+ SERIES TRIPLE 15 WATT

MODELS
VDC OUTPUT TRIPLE OUTPUT +5 and 12 +5 and 15

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
Interpoints MHF+ Series 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 +125C 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.

SYNCHRONIZATION
To synchronize the converters 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, asynchronous (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.

CONVERTER DESIGN
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.

SHORT CIRCUIT PROTECTION

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.

INHIBIT FUNCTION
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.

PACKAGING
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 dissipation and also provides greater stability when mechanically secured.

SOFT START FEATURE

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.

MHF+ SERIES TRIPLE 15 WATT

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) 300C Storage Temperature Range (Case) 65C to +150C

DC/DC CONVERTERS
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

TYPICAL CHARACTERISTICS
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

RECOMMENDED OPERATING CONDITIONS

Input Voltage Range 16 to 48 VDC continuous 80 V for up to 120 msec Case Operating Temperature (Tc) 55C to +125C full power 55C to +135C absolute Derating Output Power/Current Linearly from 100% at 125C to 0% at 135C

POSITIVE INPUT

0
FEEDBACK ISOLATOR

+5 OUTPUT

PWM CM CONTROLLER

OUTPUT COMMON INPUT COMMON

FEEDBACK ISOLATOR

+ AUX. OUTPUT

SYNC
PWM CM CONTROLLER

180

AUX. OUTPUT

FIGURE 1: BLOCK DIAGRAM

DC/DC CONVERTERS
MHF+28512T PARAMETER OUTPUT VOLTAGE CONDITION MAIN + AUXILIARY AUXILIARY OUTPUT CURRENT1 MAIN + AUXILIARY AUXILIARY TOTAL OUTPUT POWER2 MAIN + AUXILIARY AUXILIARY TOTAL OUTPUT RIPPLE VOLTAGE LINE REGULATION3 VIN = MIN. TO MAX. LOAD REGULATION3, 4 CROSS REGULATION5 INPUT VOLTAGE 10 kHz to 2 MHz 10 kHz to 2 MHz MAIN AUXILIARY MAIN AUXILIARY AUXILIARY CONTINUOUS TRANSIENT 120 ms INPUT CURRENT NO LOAD3 FULL LOAD INHIBITED3 INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT6 POWER DISSIPATION MAIN3 STEP LOAD RESPONSE3, 7, 8 AUXILIARY TRANSIENT MAIN AUXILIARY RECOVERY MAIN RECOVERY AUX. DELAY EACH OUTPUT 5 2 10 12 12 850 750 8 3 25 10 kHz to 10 MHz MAIN AUXILIARY MIN 4.95 11.64 11.64 0 16 74 TYP 5.0 12.0 12.0 20 30 25 120 25 120 28 20 705 3 20 76 MAX 5.05 12.36 12.36 1.5 0.416 0.416 2.125 7.5 5 5 15 75 90 75 240 60 240 1200 48 80 35 724 5 50 MIN 4.925 14.55 14.55 0 16 74

MHF+ SERIES TRIPLE 15 WATT

MHF+28515T TYP 5.0 15.0 15.0 20 30 25 150 25 150 28 20 705 3 20 76 5 2 10 MAX 5.05 15.45 15.45 1.5 0.333 0.333 2.0 7.5 5 5 15 75 112 75 300 60 300 1500 48 80 35 724 5 50 12 12 850 750 8 3 25 mA p-p % mA mV VDC V mV mV p-p mV W A VDC UNITS

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

mV pk ms ms

START-UP3,

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 55C to +125C. 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 s. 8. Time to settle to within 1% of Vout final value.

MHF+ SERIES TRIPLE 15 WATT

DC/DC CONVERTERS
CONNECTION DIAGRAMS
MHF+ Triple
POSITIVE INPUT
9

10 k

INHIBIT

1N4148 2N3501

200 pF

10 K 3.9 K

INPUT COMMON

FIGURE 2: INHIBIT INTERFACE

9 0.01 28V 5.1k 1 8 F 7

Positive Input Sync In Inhibit Input Common

+5 Output 2 + Aux. Output 4 Output Common 3 Aux. Output 5 Aux. Load + Aux. Load
+5 Load

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

FIGURE 3: AC COUPLING OF SYNC SIGNAL

Positive Input

Positive Output

Positive Input

28V

FMH-461 EMI FILTER

5 Input Common Output Common 4 3 Case* 8

MHF+ TRIPLE
Input Common 6

Chassis Ground

*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.

FIGURE 4: EMI FILTER CONNECTION

DC/DC CONVERTERS
PIN OUT Pin 1 2 3 4 5 6 7 8 9 Description Inhibit Main (+5 V) Output Output Common Positive Auxiliary Output Negative Auxiliary Output Case Ground Sync In Input Common Positive Input

MHF+ SERIES TRIPLE 15 WATT

If Sync is not used, leave it unconnected.

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

BOTTOM VIEW MHF+ Triple

9 8 7 6

Dotted line outlines flanged package option.

Refer to Figures 13 - 16 for dimensions.

FIGURE 5: PIN OUT BOTTOM VIEW

MODEL NUMBERING KEY

MHF+ 28 512 T Base Model Input Voltage Output Voltage (Main and aux. Vout) Number of Outputs (T = triple) Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position.) F / ES

SMD NUMBERS
STANDARD MICROCIRCUIT DRAWING (SMD) 5962-9560101HXC 5962-9560201HXC MHF+ SIMILAR PART MHF+28512T/883 MHF+28515T/883

Flanged SMDs have the suffix HZC instead of HXC. For exact specifications for an SMD product, refer to the SMD drawing. SMDs can be downloaded from http://www.dscc.dla.mil/programs/smcr

MHF+ SERIES TRIPLE 15 WATT

80 75 EFFICIENCY 16 V

DC/DC CONVERTERS
80 75 EFFICIENCY
200 mV / div.

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

5 VDC

28 V 70 65 60 55 48 V

70 65 60 55

28 V 48 V

500 mV / div.

+15 VDC 15 VDC

10

12

14

16

10

12

14

16

OUTPUT POWER (W)

OUTPUT POWER (W)

5 ms / div. INPUT V: 16 TO 40 VDC, 15 = 250 mA EACH, +5 = 1.5 A

MHF+28512T EFFICIENCY

MHF+28515T EFFICIENCY

MHF+ 28515T STEP LINE RESPONSE

MHF+28512T has a similar response

FIGURE 6

FIGURE 7

FIGURE 8

10 V / div.

10 V / div.

10 V / div.

VIN

VIN

VIN

INPUT GND 2 V / div. +5 VDC

INPUT GND 2 V / div. 5 V / div. +5 VDC

+12 VDC

+5 GND 5 ms / div.

+5 GND 5 ms / div.

12 VDC

5 ms / div.

MHF+28512T TURN ON INTO FULL LOAD MAIN

MHF+28515T has a similar response

MHF+28512T TURN ON INTO FULL LOAD MAIN

MHF+28515T has a similar response

MHF+28512T TURN ON INTO FULL LOAD AUXILIARIES

MHF+28515T has a similar response

FIGURE 9
11.5 11 INPUT VOLTAGE 10.5 10 MHF+28512T 9.5 9 8.5 2 4 6 8 10 12 14 16 MAXIMUM OUTPUT POWER (W) MHF+28515T

FIGURE 10

FIGURE 11

LOW LINE DROPOUT

FIGURE 12

MHF+ SERIES TRIPLE 15 WATT

DC/DC CONVERTERS
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 300C for 10 seconds per pin.

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

CASE E BOTTOM VIEW See Figure 14 for pin configurations.

1.130 max (28.70)

1.460 max (37.08)

FIGURE 13: CASE E MAXIMUM DIMENSIONS

BOTTOM VIEW CASE E2 MHF+ Series Triple: Screening Standard, ES, or 883
Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one.
0.960 (24.38)

0.030 dia. (0.76)

0.160 (4.06) 0.000 0.330 max (8.38) 0.25 (6.35) 0.25 (6.35) 0.330 max (8.38) 0.000 0.000 0.000

0.205 (5.21)

FIGURE 14: CASE E2

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.

0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07)

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

MHF+ SERIES TRIPLE 15 WATT

CASE G BOTTOM VIEW Flanged package See Figure 16 for pin configuration

1.130 max (28.70)

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

2.005 max (50.93)

CAUTION Heat from reflow or wave soldering may damage the device. Solder pins individually with heat application not exceeding 300C for 10 seconds per pin.

Flange Thickness: 0.047 (1.19)

FIGURE 15: CASE G MAXIMUM DIMENSIONS

BOTTOM VIEW CASE G2 Flanged case: Designator (F) required in Case Option position of model number. MHF+ Series Triple: Screening Standard, ES, or 883
Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one.
0.960 (24.38)

5
0.128 dia (3.25)

0.030 dia. (0.76)

0.560 (14.22)

0.160 (4.06) 0.000 0.330 max. (8.38) 0.330 max. (8.38) 0.25 (6.35) 0.25 (6.35) 0.140 (3.56) 0.000 0.000 0.000

0.505 (12.83)

0.705 (17.91)

0.905 (22.99)

1.105 (28.07)

0.205 (5.21)

FIGURE 17: CASE G2

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.

1.590 (40.39)

MHF+ SERIES TRIPLE 15 WATT

TEST PRE-CAP INSPECTION Method 2017, 2032 TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65C to 150C Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g BURN-IN Method 1015, 160 hours at 125C 96 hours at 125C case (typical)

DC/DC CONVERTERS
TABLE 1: ENVIRONMENTAL SCREENING
STANDARD /ES /883 (Class H)*

yes

yes

yes

no no

no yes

yes no

no no

no yes

yes no

no no

no yes

yes no

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55C, +25C, +125C Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes yes no no yes yes yes no yes yes no no yes no yes yes no

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 55C to +125C.

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

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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.