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求问TPS53355的问题,芯片没有启动

按照TI的webench上给的方案做的,然后上电后EN给4.3V,Vreg是5.1V,RF是0.95V,TRIP是2.3V,但是PGOOD却是0V,输出也是0V,貌似芯片没有启动,应该从哪检查呢?PCB焊了好几块了都是相同问题