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UCC27201A: Could you please comment on a waveform of HI & HS coupling?

Wilson Guo11
Prodigy 570 points
Part Number: UCC27201A

Hi team,

Recently, my customer tested and get a waveform of HI & HS coupling. As below waveform shows. The yellow channel is HS, the blue channel is HI. And we can see a little rise of HI when HS goes high. Could you please help comments on this? Is there any coupling about this two pins?

Thanks a lot. Look forward your kindly reply. 

Best regard

Wilson