As shown in the figure above, a high-Voltage open-loop BUCK structure is constructed using UCC27211A。
The test conditions： VBUS=50V, VDD=8V,HI,LI fsw=100Khz,D=50%，HI,LI Deadtime=100ns，no Load。
The test wave：
CH1:HS , CH2:HO, CH3:Inductance current waveform, CH4:LO
Question：Why does HO fall down in the middle, HS=HO, and the upper tube of the drive is not open？？？
Please help answer ，thank you very much！
