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LSF0108: 芯片内部工作原理

Part Number: LSF0108

在application report中看到LSF010x的基本框图,但是框图中没有标明MOSFET的源极和漏极,请问和vrefA相连的是源极还是漏极?VBPU是起到什么作用?芯片是如何通过两个MOSFET实现了自动双向电压转换?