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TPA3251D2接4欧负载起保护

TPA3251D2接4欧负载,功率去到3/2左 右就开始打隔,用36V-DC稳压电源测试的,四个通道只有B和C通道出现打隔,A和D通道去到削波都不会出现保护,这是什么问题呢?请教TI大师,