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关于宽范围输入降压稳压控制芯片LM25117问题

Other Parts Discussed in Thread: LM25117

这是TI上设计的电路图,是一个14~35V输入5V输出的稳压降压电路,请问高边HO电压达到4v,低边LO为0v,正常吗?是芯片坏了还是怎么了呢,还有就是,电感接入之后HO直接变成0v是怎么回事?在线等啊,求大神指导