RT9591

Preliminary

3

DS9591-07 August 2007

www.richtek.com

Patent Pending

Figure 3. Photoflash Capacitor Charger Application with Center-Tap Transformer

DRVIN

VDRV

GNDDRV

FB

DRVOUT

CHARGE

STAT

VDD

FBVD

Flash-Tube

R2

C

OUT

5V

R4

T1

Q1

R3

R5

R7

C

IN

1uF

R6 1M

V

BAT

V

DD

Strobe

100uF/

300V

RT9591

R1

PGND

10uF

1.5M

1 : 15

100k

1k

1M

2M

19k

V

OUT

SW

12

11

10

9

13

14

15

16

1

2

3

4

8

7

6

5

3.3V

Delta

86A-3145B

GSD2004S

AO3400

114

1

0.1uF

1.8V to 6.5V