UCC28780: UCC28780 Startup transition

Part Number:UCC28780

Hi,

I have some question about the startup transition.

In the datasheet page 27, during Vcst(SM1)=0.28V, the PWMH is disabled. So it means there will be no resonant current during this stage.

But in the test waveform, I found the PWMH is active, so you can see there will be resonant current during this stage.

CH2: Vcs; CH4: Ipri;