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使用TPS53353设计了一个5v转1v的降压电路 上电后发现没有输出，用万用表检查EN端有4.7v，进入使能，测VREG没有5v输出，表示内部LDO未工作，LL端也无最终的1v输出。
上面的图片挂了，原理图与pcb补在回帖里。
