點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DM11A
Constant-Current Output
Constant-current value of each output channel is set by an external resistor connected between
the REXT pin and GND. Varying the resistor value can adjust the current scale ranging from 3mA to
60mA. The reference voltage of REXT terminal (Vrext) is approximately 1.25V. The output current
value is calculated roughly by the following equation:
Iout(mA)
5
10
20
47
30
46
40
50
M
48.85
48.15
44.88
43.43
Output Current as a Function of Rrext value
60
55
50
45
40
35
30
25
20
15
10
5
Vrext (V)
Rrext (KΩ)
×
Iout (mA) ~
M
0
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22
Rext （kΩ）
Output Current as a Function of Output Voltage
60
55
50
45
40
35
30
25
20
15
10
5
0
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(V)
In order to obtain a good performance of constant-current output, a suitable output voltage is
necessary. Users can get related information about the minimum output voltage above.
8-bit Constant Current LED Driver
Version:A.003
Page 10
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