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TPS40055 OCP

现在遇到个问题 OCP大了一点12A==》12.5A,根据SPEC量 上管DS导通时候的压差,为啥我加载和不加载压差都是800mV左右?

工作原理是上管DS导通时候的压差与Ilimit电阻上的压降比较吗?哪位来指点下,当然,改Ilimit电阻可以解这个问题,但为啥压差不变?

或者我量错了?还是别的什么原因。