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LM5113半桥驱动高端输出正常,低端恒为高,这是怎么回事?

Other Parts Discussed in Thread: LM5113

最近毕业设计用到了LM5113驱动EPC2020,发现输出只有高端那一路是正常的,而低端输出恒为高电平(4.7V),这种情况在一开始测试时并未出现,后来又测试时便出现这样的现象,而且一直如此。测试时主电路并未上电只是单独对LM5113做的上电测试。测试波形如下图,请问是哪里出现的问题?