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LT1424-5

Isolated Flyback Switching Regulator with 5V Output

Linear Technology 

LT1424-5

TYPICAL PERFOR A CE CHARACTERISTICS

Switch Saturation Voltage

vs Switch Current

1.2

1.0

125°C

0.8

25°C

0.6

–55°C

0.4

0.2

0

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

SWITCH CURRENT (A)

1424-5 G01

Reference Voltage

vs Temperature

5.36

5.34

5.32

5.30

4.28

4.26

4.24

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1424-5 G04

Switching Frequency

vs Temperature

300

295

290

285

280

275

270

265

– 50 – 25

0 25 50 75

TEMPERATURE (°C)

100 125

1424-5 G07

Switch Current Limit

vs Duty Cycle

2.0

TA = 25°C

1.5

1.0

0.5

0

0 10 20 30 40 50 60 70 80 90 100

DUTY CYCLE (%)

1424-5 G02

Feedback Amplifier Output

Current vs Flyback Voltage

60

25°C

40

125°C

–55°C

20

0

–20

–40

–60

–80

4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25

FLYBACK VOLTAGE (V)

1424-5 G05

Minimum Synchronization

Voltage vs Temperature

2.50

2.25

2.00

1.75

1.50

1.25

1.00

0.75

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1424-5 G08

4

Minimum Input Voltage

vs Temperature

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1424-5 G03

VC Pin Threshold and High Clamp

Voltage vs Temperature

2.50

2.25

VC HIGH CLAMP

2.00

1.75

1.50

1.25

VC THRESHOLD

1.00

0.75

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

1424-5 G06

SHDN Pin Input Current

vs Voltage

1

TA = 25°C

0

–1

–2

–3

–4

0

1

2

3

4

5

SHDN PIN VOLTAGE (V)

1424-5 G09

sn14245 14245fs

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