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Original question:

一个BUCK电路的仿真（使用UCC27211)

UCC27211A: UCC27211A

Arno he
Prodigy 30 points
Part Number: UCC27211A

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！