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TPA3221在12V以下频繁保护

Other Parts Discussed in Thread: TPA3221

我用TPA3221过程中发现当PVDD在低电压时候,频繁保护。PVDD电源电压较高时正常。请问这是什么原因?输出使用两个4欧姆 20瓦喇叭并联。这是原理图: