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TPA3112加电测试，电源显示电流为零，我用万用表测各供电管脚电压，都正常的，很是郁闷
用万用表测一下电源引脚到地的阻抗。另外输出正常吗
另外，SD引脚是高电平还是低电平啊，若是低电平，则进入shutdown模式了，在no load, PVcc=21V时静态电流只有大约400uA.
890R，输出不正常
sd通过一个100K电阻接到PVCC了
