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用LM5022设计一个19V输入,24V/3A输出,电压输出怎么会是这个样子?

Other Parts Discussed in Thread: LM5022

电路完全按照webench设计,电路如下

电源适配器19V/4A,电源接入后,输入的19V电压被拉低了,

如下图黄色为19V输入端的电压波形,蓝色为24V输出端的波形(只有2V左右)

下图黄色是NMOS的G极的波形,蓝色是NMOS的S极的波形

LM5022第四脚VCC波形如下

求教各位指导一下,问题究竟在哪里?