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AS1101/AS1102/AS1103/AS1104
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
8 Application Information
Figure 19. Typical Application Diagrams
V IN
2 Diode Control with Enable
V IN
3 Diode Control with Enable
I1/I2 V SAT
I3/I4
I1 V SAT
I2
I3
V SET
I SET
V SET
I SET
(3V)
R SET CTRL
AS1101
(3V)
R SET CTRL
AS1102
ENABLE
ON
V IN
GND
4 Diode Control
ENABLE
ON
V IN
GND
4 Diode Control with Enable
I1 V SAT I2
I3
I4
I1 V SAT I2
I3
I4
I SET
V SET
(3V)
I SET
R SET CTRL
AS1103
V SET
(3V)
R SET CTRL
AS1104
ENABLE
ON
GND
GND
Setting the LED Current
The current going into the LEDs is approximately OCMR times greater then the current I SET . LED current is controlled
by V SET and R SET (see Figure 19 ) according to the formula:
I LED = OCMR x (V SET - V CTRL )/R SET
(EQ 1)
For V SET = 3V and a specific LED current, the value of R SET can be determined using the graphs shown in Figure 9 ,
Figure 10 , and Figure 11 on page 7. For any other option, the value of I SET can be determined using the graph in
Figure 3 on page 6 .
Note: LED brightness can also be adjusted by driving pin ENABLE or pin CTRL with a PWM signal.
www.austriamicrosystems.com
Revision 1.5
9 - 13
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