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UCC28950 current sensing abnormal waveform

Di Wang
Expert 1740 points
Other Parts Discussed in Thread: UCC28950

Hi,

This is the current sensing circuit for CS of UCC28950. R10：100Ω,C14:1nF.

When I disconnected this circuit from CS, the current waveform is as below shows. Yellow is the actual current in power stage. Green is the waveform after R10 C14 filter.

After I connected the current sensing circuit to RS of UCC28950, the waveform is changed as below. The peak value of the green waveform (signal after R10 C14 filter which is the same with the above) is clipped. Could you help analyse how the clipped current signal happens?

Thanks!