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TPA3112D1-Q1: 为什么SD脚总是低电平,我电路是否正确

Part Number: TPA3112D1-Q1

 这个是1、2脚上电后的波形。 这个是我电路原理图。我把SD脚断开(从PCB上翘起来)后 FAULT脚是高电平,连接SD脚后SD和FAULT脚波形如图一所示。为什么会出现这个现象。