ABSOLUTE MAXIMUM RATINGS

TYPICAL CHARACTERISTICS

INHIBIT

RECOMMENDED OPERATING CONDITIONS

Input Voltage

• 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

Output Voltage Temperature 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 Voltage 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

—

—

10

—

—

12

—

—

12

W

OUTPUT RIPPLE

10 kHz to 2 MHz

—

40

60

—

30

60

—

25

50

mV p-p

LINE REGULATION

—

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

—

%

POWER 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).