AS1101 데이터 시트보기 (PDF) - austriamicrosystems AG

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AS1101

Low-Dropout LED Drivers

austriamicrosystems AG 

AS1101/AS1102/AS1103/AS1104

Data Sheet - Application Information

8 Application Information

Figure 19. Typical Application Diagrams

2 Diode Control with Enable

VIN

VSET

(3V)

ISET

I1/I2 VSAT

I3/I4

RSET CTRL

AS1101

ENABLE

ON

GND

4 Diode Control

VIN

I1 VSAT I2

I3

I4

VSET

(3V)

ISET

RSET CTRL

AS1103

GND

3 Diode Control with Enable

VIN

I1 VSAT I2

I3

VSET

(3V)

ISET

RSET CTRL

AS1102

ENABLE

ON

GND

4 Diode Control with Enable

VIN

I1 VSAT I2

I3

I4

VSET

(3V)

ISET

RSET CTRL

AS1104

ENABLE

ON

GND

Setting the LED Current

The current going into the LEDs is approximately OCMR times greater then the current ISET. LED current is controlled

by VSET and RSET (see Figure 19) according to the formula:

ILED = OCMR x (VSET - VCTRL)/RSET

(EQ 1)

For VSET = 3V and a specific LED current, the value of RSET 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 ISET 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.

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