點晶科技股份有限公司

SILICON TOUCH TECHNOLOGY INC

.

3-CHANNEL CONSTANT CURRENT LED DRIVERS

Version:A.003

Page 8

未經授權而逕予重製、複製、使用或公開本文件，行為人得被追究侵權之相關民刑事責任

Unauthorized reproduction, duplication, use or disclosure of this document will be deemed as infringement.

DM412

Constant-Current Output

Constant-current value of each output channel is set by an external resistor connected between

the R(G、B)REXT pin and GND individually. The current scale ranging can be adjusted from 5mA

to 200mA by varying the resistor value. The output current value is calculated by the following

equation:

Output Current as a Function of REXT value

0

20

40

60

80

100

120

140

160

180

200

0

1020304050

60708090

100

110

120

REXT (ohm)

Output Current as a Function of Output Voltage

0

20

40

60

80

100

120

140

160

180

200

220

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

2.2

2.4

2.6

2.8

3

Vout (volt)