LT3475IFE datasheet(4/20 Pages) LINER

Part #	LT3475IFE

Description	Dual Step-Down l 1.5A LED Driver

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3475/LT3475-1

4

3475fb

Switch Current Limit

vs Duty Cycle

Switch Current Limit vs

Temperature

Oscillator Frequency

vs Temperature

Oscillator Frequency Foldback

Oscillator Frequency vs RT

Current Limit vs Output Voltage

TYPICAL PERFOR A CE CHARACTERISTICS

LED Current vs VADJ

LED Current vs Temperature

Switch On Voltage

VADJ (V)

0

0.25

0.50

0.75

1.00

1.25

1.50

0.25

0.5

0.75

1

3475 G01

1.25

TA = 25°C

TEMPERATURE (˚C)

–50

0.8

1.0

1.2

25

75

3475 G02

0.6

0.4

–25

0

50

100

125

0.2

0

VADJ = VREF • 7/30

VADJ = VREF • 2/3

SWITCH CURRENT (A)

0

100

200

300

400

0.5

1.0

1.5

2.0

3475 G03

500

600

TA = 25°C

DUTY CYCLE (%)

0

0.5

1.0

1.5

2.0

2.5

3.0

20

40

60

80

3475 G04

100

MINIMUM

TYPICAL

TA = 25°C

TEMPERATURE (°C)

–50

2.0

2.5

3.5

25

75

3475 G05

1.5

1.0

–25

0

50

100

125

0.5

0

3.0

VOUT (V)

0

0.5

1.0

1.5

2.0

0.5

2.5

3.0

3.5

2.0

1.0

1.5

4.0

3475 G06

2.5

3.0

TA = 25°C

TEMPERATURE (˚C)

–50

600

650

700

25

75

3475 G07

550

500

–25

0

50

100

125

450

400

RT = 24.3kΩ

VOUT (V)

0

500

600

700

2.0

3475 G08

400

300

0.5

1.0

1.5

2.5

200

100

0

TA = 25°C

RT = 24.3kΩ

RT (kΩ)

1

10

1000

10

100

3475 G09

TA = 25°C

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