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UCC3895EVM-001: 带载波形不稳定,出现振荡

Part Number: UCC3895EVM-001

UCC3895EVM-001在加电带载时,低压输入时波形很稳定,到额定值时,OUTC和OUTD桥臂中点波形不稳定,从现象看像是自激振荡,是什么原因?是不是需要调整环路参数?