Hi,
I got the following problem:
I got a SS disable circuit. The circuit test if the mosfet temperature is below a threshold. Is so the SS is released. Because of noise the PFC is not working properly.
The SS disable:
This circuit is switched by some comparators.
SS circuit on UCC28070A:
When I remove Q2, everything works fine. So how do I reduce SS introduced noise. My suggestion is to add a 1k resistor between SS and Q2. So that there is some time to empty C7.
Any better suggestions?
EVS