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LM25183: 输出电压不对

Part Number: LM25183

电路设计如下图所示,需求为输入28.5V,输出隔离的5V,电路搭建完成后,给28.5V供电,测量电容C29两端电压为7.5V左右,LM25183芯片的pin7(RSET)电压为40-50Mv,芯片手册上的值为1.21V。拿掉D4(BZX585-C7V5),测量C29两端电压为9V左右,LM25183芯片的pin7(RSET)电压仍为40-50Mv。请问是电路哪里设计的不合适导致芯片的pin7(RSET)电压不正常并且输出电压不对。

原理图:

PCB: