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LM3481的过流保护不起作用,不知道什么原因???

调试3481做的电源,现在就过流保护不起作用了,不知道为何?难道买到假货了么?我看到手册计算过流保护的公式:

但是内部框图给的并不是Vsense电压,而是Vsc:

手册中中这两个参数有什么区别么: