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LM5146电流检测模式如何判断的?

Other Parts Discussed in Thread: LM5146-Q1

Datasheet中关于过流保护模式的介绍有两种,一种是用下管的Rdson作为检流电阻,另一种是在下管和地之间串一个检流电阻Rs。芯片自己会在启动的时候判断外部接的模式,如下图。但是具体是如何实现模式区分的?