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AS3691
Datasheet
9 Application Information
Typical Application Schematic
For RGB leds (and a white color balancing circuit) use the following application schematic including automatic
supply regulation (feedback paths UVR, UVG, UVB):
Figure 14 – Typical AS3691 System for RGB (back-)lighting; several AS3691 can be cascaded
...
Main
supply
DCDC Converter
for VDDR
Voltage Feedback
input for DCDC
DCDC Converter
for VDDG
Voltage Feedback
input for DCDC
DCDC Converter
for VDDB
Voltage Feedback
input for DCDC
VDDR
UVR
Feedback resistor divider
(part of DCDC converter circuit)
VDDG
UVG
Feedback resistor divider
(part of DCDC converter circuit)
VDDB
UVB
Feedback resistor divider
(part of DCDC converter circuit)
VDDG
VDDB
VDDR
...
UVG
UVB
UVR
Vc
Vc
Vc
Vc
Vc
Vc
Vc
Vc
...
D1
D1
D1
...
Overtemp
AS3691
Overtemp
AS3691
Overtemp
AS3691
VSS
PWMG
PWMB
PWMR
5V Supply
5V powered
system
(optional)
PWMG
PWMB
PWMR
www.austriamicrosystems.com (ptr)
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