HT7939

Rev 1.10

9

November 3, 2009

H T 7 9 3 9

V I N

E N

S W

O V P

F B

1 0 m H

2 . 2 m F

R f b

0 . 5 7 W

G N D

4 . 7 m F

5 . 0 V

1 N 5 8 1 9

3 5 0 m A

Figure 17. Application Circuit for Drive 3 High Brightness LEDs

H T 7 9 3 9

V I N

E N

S W

O V P

F B

1 0 m H

2 . 2 m F

R f b

0 . 7 7 W

G N D

4 . 7 m F

4 . 5 V ~ 5 . 5 V

1 N 5 8 1 9

1 3 S t r i n g s

1 0 k W

P W M S i g n a l

1 5 0 k W

0 . 1 m F

1 0 k W

3 . 3 V

0 V

Figure 16. Application Circuit for Dimming Control Using a Filtered PWM Signal