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TDA2005D输出方波问题

Other Parts Discussed in Thread: TPA2005D1

请教一下技术大神,TDA2005D,HVSSOP封装,按照差分输入电路设计,输入端串联1uF电容和150K电阻,输出端总是有250K左右的方波输出,喇叭就会出现笃笃笃的声音,请问这个是什么原因?