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LM5101驱动NMOS,做降压用,输出电压波形不对

Other Parts Discussed in Thread: LM5101A, LM5101

使用LM5101A驱动NMOS,希望输出可调电压,PWM频率500KHz,占空比50%,在RES100后面接2K色环电阻做假负载。

测试负载上的电压在6V到21V之间变化,IRF4104的G极电平有短暂PWM输出,之后缓慢下降,之后再次有短暂输出后下降,如此循环

尝试更改自举电容(220NF)为100NF,输出电压无变化。

请问一下是我哪个元器件选型有问题还是LM5101的应用有错误,谢谢!