This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
I am not able to understand design criteria for opto coupler selection.
1. How resistor connected to emiiter is calculated.
2. What is the selection criteria for selection of CTR of opto coupler?
3. How voltage at FB pin varies with optocoupler connection?
Is there any detailed calculation?
Thanks and regards,
Monica
Monica,
Here are some recommended resources to provide a better understanding of optocoupler feedback
Regards,
Steve
Dear Steve,
Thank you for sharing. I have read that but I am still confused with selection of Ropto=1k ohm?
How is that value calculated? How to select CTR of opto coupler?.
As per this calculation, Iled~ 1mA. Based on this, How collector current is varying?
Monica,
There are many good resources/app notes and YouTube videos available for biasing the TL431 opto and compensating the control loops.
Regards,
Steve