TYPICAL CHARACTERISTICS

SYNC AND INHIBIT (INH1, INH2)

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

Input Voltage

• 16 to 40 VDC

Power Dissipation (Pd)

• 14 watts (16 watts SMFL2805S, SMFL2805D)

Output Power

• 40 to 65 watts depending on model

Lead Soldering Temperature (10 sec per lead)

• 300°C

Storage Temperature Range (Case)

• –65°C to +150°C

2

SMFL SERIES

65 WATT

Output Voltage Temperature Coefficient

• 100 ppm/°C typical

Input to Output Capacitance

• 150 pF, typical

Isolation

• 100 megohm minimum at 500 V

Audio Rejection

• 50 dB typical

Conversion Frequency

• Free run mode 600 kHz typical

550 kHz. min, 650 kHz max

• External sync range 525 to 675 kHz

Inhibit Pin Voltage (unit enabled)

• INH1 = 9 to12 V, INH2 = 6 to 9 V

Input Voltage Range

• 16 to 40 VDC continuous

Case Operating Temperature (Tc)

• –55°C to +125°C full power

Sync In (525 to 675 kHz)

• Duty cycle 40% min, 60% max

• Logic low 0.8 V max

• Logic high 4.5 V min, 9 V max

• Referenced to input common

• If not used, connect to input common

Sync Out

• Referenced to input common

• If not used, leave unconnected

Inhibit (INH1, INH2) TTL Open Collector

• Logic low (output disabled)

INH1 referenced to input common

Logic low 0.8 V max

Inhibit pin current 10 mA max

INH2 referenced to output common

Logic low 0.5 V max

Inhibit pin current 5 mA max

• Logic high (output enabled)

Open collector

• If not used, leave unconnected

Notes

1. Unit will shut down above approximately 45V but will be undamaged and

will restart when voltage drops into normal range.

2. Indefinite short circuit protection not guaranteed above 125°C case.

3. Recovery time is measured from application of the transient to point at

which Vout is within 1% of final value.

4. Guaranteed but not tested.

SINGLE OUTPUT MODELS

SMFL283R3S

SMFL2805S

SMFL2812S

SMFL2815S

PARAMETER

CONDITION

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

Tc = 25°C

3.27

3.3

3.33

4.95

5.00

5.05

11.88 12.00 12.12

14.85 15.00 15.15

VDC

OUTPUT CURRENT

0

—

12

0

—

10

0

—

5

0

—

4.33

A

OUTPUT POWER

0

—

40

0

—

50

0

—

60

0

—

65

W

OUTPUT RIPPLE

Tc = 25°C

—

10

35

—

15

35

—

30

75

—

30

85

VOLTAGE 10 k - 2 MHz

Tc = –55°C to +125°C

—

10

50

—

30

50

—

45

100

—

45

110

mV p-p

LINE REGULATION

—

0

20

—

0

20

—

0

20

—

0

20

mV

LOAD REGULATION

NO LOAD TO FULL

—

—

20

—

—

20

—

—

20

—

—

20

mV

INPUT VOLTAGE

CONTINUOUS

16

28

40

16

28

40

16

28

40

16

28

40

VDC

—

—

50

—

—

50

—

—

50

—

—

50

V

INPUT CURRENT

NO LOAD

—

70

100

—

70

120

—

50

80

—

50

80

mA

FULL LOAD

—

—

2.1

—

—

2.5

—

—

2.8

—

—

3.0

A

INHIBITED - INH1

—

9

14

—

9

14

—

9

14

—

9

14

mA

INHIBITED - INH2

—

35

70

—

35

70

—

35

70

—

35

70

INPUT RIPPLE

CURRENT

10 kHz - 10 MHz

—

15

50

—

15

50

—

15

50

—

15

50

mA pp

EFFICIENCY

Tc = 25°C

70

—

—

75

80

—

81

86

—

82

87

—

%

POWER DISSIPATION

SHORT CIRCUIT

Tc = 25°C

—

12.5

14

—

12.5

16

—

10

14

—

10

14

W

RECOVERY

—

1.5

4

—

1.5

4

—

1.5

4

—

1.5

4

ms

STEP LOAD RESP.

50% – 100% – 50%

TRANSIENT

—

200

300

—

250

350

—

450

700

—

500

700

mV p

—

1.5

3.0

—

1.5

3.0

—

1.5

3.0

—

1.5

3.0

ms

16 – 40 – 16 VDC

TRANSIENT

—

250

300

—

250

300

—

250

400

—

250

400

mV pk

RECOVERY

—

200

30

—

200

300

—

200

300

—

200

300

µs

START-UP

DELAY

—

3.5

6

—

3.5

6

—

3.5

6

—

3.5

6

ms

—

0

25

—

0

25

—

0

50

—

0

50

mV pk

PINS NOT USED

TR1, Master, and Slave

If not used, leave unconnected

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