LT3957AIUHE Ver la hoja de datos (PDF) - Linear Technology

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componentes Descripción

Fabricante

LT3957AIUHE

Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch

Linear Technology 

LT3957A

TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise noted.

INTVCC vs Temperature

5.4

5.3

5.2

5.1

5.0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3957A G13

INTVCC Line Regulation

5.30

5.25

5.20

5.15

5.10

0

5 10 15 20 25 30 35 40

VIN (V)

3957A G16

INTVCC Minimum Output

Current Limit vs VIN

90

TJ = 125°C

80 INTVCC = 3V

70

60

50

40

30

20

10

0

1

10

VIN (V)

100

3957A G14

INTVCC Dropout Voltage

vs Current, Temperature

700

VIN = 5V

600

500

400

125°C

75°C

25°C

300

0°C

200

–40°C

100

0

0

5

10

15

20

INTVCC LOAD (mA)

3957A G17

INTVCC Load Regulation

5.3

VIN = 6V

5.2

5.1

5.0

4.9

4.8

0

10 20 30 40

INTVCC LOAD (mA)

50 60

3957A G15

Internal Switch On-Resistance

vs Temperature

50

45

40

35

30

25

20

15

10

5

0

–50 –25

0 25 50 75

TEMPERATURE (°C)

100 125

3957A G18

Internal Switch On-Resistance

vs INTVCC

28.2

28.0

SEPIC Typical Start-Up

Waveforms

VIN = 12V

27.8

27.6

VOUT

5V/DIV

27.4

27.2

IL1A + IL1B

27.0

2A/DIV

26.8

26.6

3

4

5

6

7

8

INTVCC (V)

3957A G19

5ms/DIV

3957A G20

SEE TYPICAL APPLICATION: 5V TO 16V INPUT,

12V OUTPUT SEPIC CONVERTER

SEPIC FBX Frequency Foldback

Waveforms During Overcurrent

VOUT

10V/DIV

VIN = 12V

VSW

20V/DIV

IL1A + IL1B

5A/DIV

50μs/DIV

3957A G21

SEE TYPICAL APPLICATION: 5V TO 16V INPUT,

12V OUTPUT SEPIC CONVERTER

3957afa

6

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