RT9269_07 Datasheet, PDF (2/9 Pages) Richtek Technology Corporation – Tiny Package, High Efficiency, Constant Current LED Driver

RT9269
Typical Application Circuit
V_IN
C1
1uF
To VDD
or
D1
D2
C2
VDD
1uF
EXT
RT9269
EN
FB ^0.25V
GND
Duty Control
Brightness
C3
1uF
R1 R2
15 15
Figure 1. RT9269 drives single or parallel LED's in charge pump configuration
V_IN
C1
1uF
To VDD
or
D1
D2
VDD
EXT
RT9269
EN
FB
GND
C2
1uF
0.25V
Duty Control
Brightness
C3
1uF
R1
15
Figure 2. RT9269 drives 2 series connected LED's in charge pump configuration
V_IN
R1
1K
C2
10uF
L1
10uH to 100uH
C1
1uF
To VDD
or
Q1
VDD
LX
RT9269
EN
FB
GND
0.25V
Duty Control
Brightness
C3
10uF
R2
15
Figure 3. RT9269 drives 2~4 series connected LED's in boost rectifier configuration
Note: NICHIA NSCW100 is used for RT9269 LED parts.
www.richtek.com
2
DS9269-10 March 2007