AT1312A/B/C

Preliminary Product Information

High Efficiency, Constant Current

White-LEDs Driver

7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

2/23/2006 REV:1.1

6

70

72

74

76

78

80

82

84

86

88

90

23

4

5

6

Vin (V)

I o = 1 0 m A , L = 6 . 8 u H

I o = 1 0 m A , L = 4 . 7 u H

Efficiency vs. Vin (6 LED)

L:SR0302 D:RB501-40

I o = 1 0 m A ,

L = 1 0 u H

I o = 1 0 m A ,

L = 2 2 u H

Efficiency vs. Vin (4 LED)

L:SR0302 D:RB501-40

70

72

74

76

78

80

82

84

86

88

90

23

4

5

6

Vin (V)

I o = 1 0 m A , L = 2 2 u H

I o = 1 0 m A , L = 1 0 u H

I o = 1 0 m A , L = 6 . 8 u H

I o = 1 0 m A , L = 4 . 7 u H

Switching Transient Waveform

Ch1:LX

Ch3:Vo