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TPS54622: boot-SW ringing when Rboot is set to large value

Part Number: TPS54622

Hi Team, 

During test, we set Rboot=20ohm, Cboot= 0.1uf, then we found there is large oscillation on Boot-SW ( up to ~9V) during the period when LS FET is closed. When decreasing the Rboot, the oscillation is small. So want to check with you why there is oscillation. Thanks.