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TPS25940 压降问题

Other Parts Discussed in Thread: TPS25940

     用TPS25940 做了一个欠压、过压、过流保护电路,电路原理图如附件。其中设计输入的电源POWER_ON为7.2V,欠压电压为6V,过压电压为8V。图中R33未接。

    出现的问题:调试时发现欠压保护及过压保护正常,即低于6V,高于8V都能断开,但是导通压降非常大,经过TPS25940后电压由7.2V变为4.2V左右,此时7.2V的供电电流约为200mA。实在找不出原因,麻烦懂的坛友或者TI员工回答一下这个问题,非常感谢!!!