Tool/software:
Hello, I'd like to ask a few questions.
1. Single-phase totem pole PFC has zero-crossing distortion of inductance current, which can be eliminated by using soft start according to the document. If, according to PMP40988, after staggered parallel connection, the two-phase switch tube lags behind the main phase for half a period, then how to realize soft start to avoid zero-crossing distortion? How to open the tube of master phase and slave phase?
2. There is Ton in 2：PMP40988, which is the CrM/TCM PFC controlled by voltage COT. How to model the transfer function from output voltage to constant on time Ton, is there any reference?