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UCC28250: 4脚 ILIM 电压超过0.5V 驱动没有立即关闭

Part Number: UCC28250

UCC28250 4脚 ILIM 逐周期限流脚,规格书电压是超过0.5V就会关闭驱动,测试发现经常达到0.7V 都还没有关闭 如图黄色是 4脚波形,蓝色是驱动  ,紫色是输入的电压倍拉畸变了,绿色是输出电感的的电流波形