RT9269

Preliminary

www.richtek.com

DS9269-01 March 2003

2

Typical Application Circuit

Fig. 1 RT9269 drives single or parallel LED’s in charge pump configuration

Fig. 2 RT9269 drives 2 series connected LED’s in charge pump configuration

Fig. 3 RT9269 drives 2~4 series connected LED’s in boost rectifier configuration

Note: NICHIA NSCW100 is used for RT9269 LED parts.

VDD

EXT

FB

CE

GND

RT9269

C3

1

µ F

R1

15

Ω

C2

1

µ F

0.25V

C1

1

µ F

To VDD

or

Duty Control

Brightness

R2

15

Ω

VDD

EXT

FB

CE

GND

RT9269

C3

1

µ F

R1

15

Ω

C2

1

µ F

0.25V

C1

1

µ F

To VDD

or

Duty Control

Brightness

R2

15

Ω

VDD

EXT

FB

CE

GND

RT9269

C3

1

µ F

R1

15

Ω

C2

1

µ F

0.25V

C1

1

µ F

To VDD

or

Duty Control

Brightness

D1

D2

VDD

EXT

FB

CE

GND

RT9269

C3

1

µ F

R1

15

Ω

C2

1

µ F

0.25V

C1

1

µ F

To VDD

or

Duty Control

Brightness

D1

D2

VDD

LX

FB

CE

GND

RT9269

C3

10

µ F

R2

15

Ω

Q1

0.25V

C2

1

µ F

To VDD

or

Duty Control

Brightness

C1

10

µ F

L1

10

µ H ~ 100µ H

R1

1K

VDD

LX

FB

CE

GND

RT9269

C3

10

µ F

R2

15

Ω

Q1

0.25V

C2

1

µ F

To VDD

or

Duty Control

Brightness

C1

10

µ F

L1

10

µ H ~ 100µ H

R1

1K