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TPS54160: The waveform in BCM mode

Part Number: TPS54160

Hi team,

I'm testing the PMLKBUCLEVM, and I found that when Vin=24V, Vout=3.3V, fsw=500kHz, one or more screams can be observed in the waveform of SW point. The waveforms are shown bellow. I wondering the reason which rise this phenomenon. Is it the normal phenomenon when the device is working in BCM mode? Could you help me to explain it. Thanks a lot.

Waveform of Iload=1A

Waveform of Iload=1.2A