點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
新竹市科學園區展業一路9號7樓之1
9-7F-1, Prosperity RoadⅠ, Hsin-Chu, Taiwan, R.O.C.
DM634
Tel：886-3-5645656
Fax：886-3-5645626
Constant-Current Output
Constant-current value (Iout*1) of each output channel is set by an external resistor connected
between the REXT pin and GND. The current scale ranging can be adjusted from 5mA to 70mA by
varying the resistor value. User can input GBC value to increase Iout to 90mA. The reference
voltage of REXT terminal (Vrext) is approximately 1.23V. The output current value is calculated by
the following equation:
Iout(mA)
5
10
20
30
40
50
60
70
M
41.13
39.35
36.78
35.09
33.75
32.53
31.35
30.09
Output Current as a Functiono Rext value
80
70
60
50
40
30
20
10
0
V
rext(V)
Iout*1 (mA) ~
×
M
Rrext (KΩ)
0
1
2
3
4
5
6
7
8
9
10
Rext(KΩ)
Output Current as a Function of Output Voltage
80
70
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
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.
*1 Iout is typical current value setting under 100% PWM duty cycle and 95 DGBC Value.
16-channel 16-bit PWM Constant Current LED Driver
Version : A.003
Page 9
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