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UCC28180: UCC28180在使用过程中,发生电流失控

Part Number: UCC28180

您好,在设计中发现,按照设计计算PIN2脚的电压会到7V,并且发生钳位,这个时候电流失控,输入电流会增加。

当把输入采样电阻9毫欧,更换成5毫欧就不会出现这个现象,但是peak current limit会非常大,这个会是由于什么原因引起的?应该怎么改善