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TIDA-010203: PFC control math equation problem

Expert 1035 points
Part Number: TIDA-010203
Other Parts Discussed in Thread: TIDM-1007, TIDM-02008

Hi TI expert,

In the TIDA-010203 FW, there is an equation used to calculate the PFC voltage loop

It seems TI's method is not like the traditional method.

I would like to know what's TI method to calculate the PFC voltage loop in the below math equation, any document can share with me to know more about that?