LT3478-1 datasheet(5/20 Pages) LINER

Part #	LT3478-1

Description	Full-Featured LED Driver with 1.5A Switch Current

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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LT3517

5

3517ff

VISP – VISN Threshold

vs Temperature

Switch Current Limit

vs Temperature

Oscillator Frequency

vs Temperature

Reference Voltage

vs Temperature

Quiescent Current vs VIN

TEMPERATURE (°C)

–40

103

20

3517 G04

100

98

–20 0

40

97

96

104

102

101

99

60 80 100 120 140 160

VIN = 5V

VISP = 24V

VC = 1V

VCTRL = 2V

TEMPERATURE (°C)

–40 –20

1.5

1.9

2.5

0

40 60

3517 G06

1.7

2.3

2.1

20

80

160

100 120 140

VIN = 5V

RT = 6.04k

VISP (V)

0

101

103

105

40

3517 G07

99

97

100

102

104

98

96

95

10

20

30

50

VCTRL = 2V

VIN = 5V

TA = 25°C

VC = 1V

TEMPERATURE (°C)

–40

1.98

1.99

2.00

2.01

2.02

–20 0

20 40

3517 G08

60 80 100 120 140 160

VIN = 5V

VIN (V)

0

4

5

6

40

3517 G09

3

2

0

10

20

30

1

8

7

TA = 25°C

VC = 0V

VISP – VISN Threshold vs VISP

TYPICAL PERFORMANCE CHARACTERISTICS

FB Pin Threshold vs Temperature

PMOS Turn-On

PMOS Turn-Off

TEMPERATURE (°C)

–40

0.98

1.00

0.99

1.01

1.03

1.02

1.04

–20 0

20 40

3517 G10

60 80

140 160

100 120

VIN = 5V

5V

PWM

0V

40V

TG

30V

200ns/DIV

VISP = 40V

3517 G11

5V

PWM

0V

40V

TG

30V

200ns/DIV

VISP = 40V

3517 G11

TEMPERATURE (°C)

–40 –20

0

1.0

2.5

0

40 60

3518 G05

0.5

2.0

1.5

20

80 100 120 140 160

VIN = 5V

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