Excuse me, if the VCC and VDD voltages are different, if the coefficient is 1, is the current flowing through R1 equal to the current flowing through R3?
Monroe 發表於 July 7, 2020
Does the current flowing through this photodiode only depend on the degree of light emitted by the LED? Is it related to the power supply VCC and R1, VDD and R3?
Immanuel 發表於 July 7, 2020
The magnitude of the current flowing through the PD2 photodiode depends on the degree of light emitted by the LED; it is also related to the power supply VCC and R1, VDD and R3.
If, VCC = VDD, R1 = R3, then Ip1 = Ip2.
Christy 發表於 July 7, 2020
1. Cost problem, the price of this optocoupler is relatively high, much higher than PC817;
2. When this optocoupler is wired, the isolation is not very easy to make;
3. I use PC817, add software calibration, and write the calibration coefficient into EEPROM, which can be used now.
