Other Parts Discussed in Thread: UCC28700,
I want to simulate Power supply using UCC28700 in LTSPICE, but the UCC28700 was encrypted, so I need to build similar function model as UCC28700.
I tried to use auxillary winding signal as feedback, but I don't know how to control the MOS to shut down, I only know how to turn on MOS;
If I sample feedback signal from primary current, then where the voltage feedback connect to ?
the more serious question is: how I control the frequency? (I have tested the circuit using UCC28700, finding that the frequency is variable at different load and Vin, so during simulation, i must know detail control in order for better circuit)