LM3639A datasheet(10/28 Pages) TI

Nome de Peças	LM3639A

Descrição Electrónicos	Single Chip 40V Backlight 1.5A Flash LED Driver

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Fabricante Electrônico	TI [Texas Instruments]

Página de início	http://www.ti.com

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0.01

0.1

1

10

100

1.E+0

1.E+1

1.E+2

1.E+3

1.E+4

1.E+5

1.E+6

f

PWM (Hz)

C033

Duty-Cycle = 50%

I

LED = 19mA

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

500 kHz.

1 MHz.

C022

I

LED = 19mA

2x7 LEDs

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

500 kHz.

1 MHz.

C022

I

LED = 19mA

2x5 LEDs

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

500 kHz.

1 MHz.

C022

I

LED = 19mA

2x6 LEDs

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

500 kHz.

C022

I

LED = 19mA

10 LEDs

50%

55%

60%

65%

70%

75%

80%

85%

90%

95%

100%

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

V

IN (V)

500 kHz.

1 MHz.

C022

I

LED = 19mA

2x4 LEDs

LM3639A

SNVS964 – MARCH 2013

www.ti.com

TYPICAL PERFORMANCE CHARACTERISTICS (continued)

Unless otherwise specified: TA = 25°C; VIN = 3.6V; VEN = VIN; CIN= 10 μF, COUTF= 10 μF, COUTB = 1 μF (50V 0805 case

size); LF = 1

μH; LB = 22 μH.

Figure 27. Backlight Efficiency vs Input Voltage

Figure 28. Backlight Efficiency vs Input Voltage

Single String - 10 LEDs

Dual String - 2x4 LEDs

Figure 29. Backlight Efficiency vs Input Voltage

Figure 30. Backlight Efficiency vs Input Voltage

Dual String - 2x5 LEDs

Dual String - 2x6 LEDs

Figure 31. Backlight Efficiency vs Input Voltage

Figure 32. PWM Input Filter Response

Dual String - 2x7 LEDs

10

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