CAT4103V-GT2 Datasheet, PDF (9/13 Pages) ON Semiconductor – 3-Channel Constant-Current RGB LED Driver

APPLICATION INFORMATION
CASCADING MULTIPLE DEVICES
The CAT4103 is designed to be cascaded for driving
multiple RGD LEDs. Figure 5 shows three CAT4103
drivers cascaded together. The programming data
from the controller travels serially through each
device. Figure 4 shows a programming example
turning on the following LED channels: BLUE3,
GREEN2 and RED1. The programming waveforms
are measured from the controller to the inputs of the
first CAT4103.
CAT4103
Figure 4. Programming Example
5V
C1
1µF
C2
1µF
RED1 GREEN1 BLUE1
C3
1µF
RED2 GREEN2 BLUE2
RED3 GREEN3 BLUE3
VDD LED1 LED2
LED3
VDD LED1 LED2
LED3
VDD LED1 LED2
LED3
BIN
BOUT
LIN
CAT4103
LOUT
SIN
#1
SOUT
CIN
COUT
BIN
BOUT
LIN
CAT4103
LOUT
SIN
#2
SOUT
CIN
COUT
BIN
BOUT
LIN
CAT4103
LOUT
SIN
#3
SOUT
CIN
COUT
GND RSET1 RSET2 RSET3
GND RSET1 RSET2 RSET3
GND RSET1 RSET2 RSET3
R1
R2
R3
R4
R5
R6
R7
R8
R9
Figure 5. Three Cascaded CAT4103 Devices
© 2008 SCILLC. All rights reserved.
9
Characteristics subject to change without notice
Doc. No. MD-5038, Rev. A