LX1996

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 8

Copyright

© 2007

Rev. 1.0, 2007-12-14

Multi-string LED Back-light Controller

TM

®

Typical Characteristics @ 25°C (Refer to Figure 1)

Efficiency Vs Output load

Analog dimming mode

40%

50%

60%

70%

80%

90%

100%

0

20

40

60

80

100

120

Total LED current (m A)

6V-Eff

12V-Eff

18V-Eff

System Efficiency Vs Output Load

Analog Dimming Mode

Sleep current Vs input voltage

3

4

5

6

7

8

9

10

11

6

8

10 12 14 16 18 20 22 24 26 28

Vin (V)

( NO LOAD)

STRING CURRENT MATCHING

Vs

Input Voltage

Quiescent current Vs input voltage

1

1.2

1.4

1.6

1.8

2

6

8

10 12 14 16 18 20 22 24 26 28

Vin (V)

LED String Current Matching Vs. Input Voltage

-0.5%

-0.4%

-0.3%

-0.2%

-0.1%

0.0%

0.1%

0.2%

0.3%

0.4%

0.5%

3

6

9

1215

1821

Input Voltage (V)

Variation ILED1

Variation ILED2

Variation ILED3

Variation ILED4

Variation ILED5

Variation ILED6

DI MMI NG

PWM output Vs Analog input

0.4

0.598

0.795

0.99

1.2

1.379

1.59

1.78

1.97

2.2

2.36

0

10

20

30

40

50

60

70

80

90

100

0.25

0.5

0.75

1

1.25

1.5

1.75

2

2.25

2.5

Analog input (V)

.

LED current Vs Analog input

2

4.9

10.4

15.6

20.1

0

4

8

12

16

20

24

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

Analog input (V)