ST2226A SiTi, ST2226A Datasheet - Page 17

• Manufacturer Part Number: ST2226A
• Description: PWM-Controlled Constant Current Driver
• Manufacturer: SiTi

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3) Driver Current Output
REXT pin and GND. Varying the resistor value can adjust the current scale ranging
from 5mA to the maximum 60 mA. Note that the REXT pin voltage is designed to be
independent of supply voltage, temperature, and process variation, and is
approximately 1.26V.
ST2226A
The drive current is set by an external resistor, Rext, connected between the
The output current could be calculated roughly by the following equation:
The full-scale current IOUT vs. Rext is shown in Figure 8.
點晶科技股份有限公司
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
點晶科技股份有限公司
點晶科技股份有限公司
Iout = (1.26 / Rext) x 51
70
60
50
40
30
20
10
0
Figure 8. Driver current as a function of R
0
2
Version ： ： ： ： A.010
4
Rext - Iout
Rext (Kohm)
6
8
10
EXT
12
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ST2226A