Operations introduction
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⚫ I: output current of LED constant current source;
⚫ Vd: break-over voltage of diode (string);
⚫ R: constant resistance.
V-I curve of LED is as shown below.
According to four parameters above and the V-I curve of LED, you can
calculate the value of R and Vd .
NOTE
The value of V2, V1, I2 and I1should be close to the static working point of LED as shown
in the red circle above.
Or you can calculate the value of R and Vd by the following method.
Vd=V*0.8
R=0.2V/I
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