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TPS73033使用问题



附件是我们电路板的原理图,下图是PCB layout。 TPS73033仅仅用来给几个按键和电位器供电,故障主要是初次上电LDO就不输出或者输出等于输入。我测试过前级DC-DC 的上电波形,没有任何冲击出现。现在小批500套出现了35片坏的,哪位大神分析下,谢谢!