AS3691

Datasheet

www.austriamicrosystems.com (ptr)

Revision 2.3

14 - 22

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

VSS

VDDR

UVR

UVB

UVG

PWMR

PWMB

PWMG

VDDB

VDDG

Overtemp

AS3691

D1

Vc

Vc

Vc

Vc

Overtemp

AS3691

D1

Vc

Vc

Vc

Vc

UVR

VDDR

Voltage Feedback

input for DCDC

DCDC Converter

for VDDR

Main

supply

Feedback resistor divider

(part of DCDC converter circuit)

...

UVG

VDDG

Voltage Feedback

input for DCDC

DCDC Converter

for VDDG

Feedback resistor divider

(part of DCDC converter circuit)

UVB

VDDB

Voltage Feedback

input for DCDC

DCDC Converter

for VDDB

Feedback resistor divider

(part of DCDC converter circuit)

5V powered

system

(optional)

PWMR

PWMB

PWMG

...

...

5V Supply

Overtemp

AS3691

D1

...