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LM5022: WEbench 仿真结果和Multisim 仿真结果为何这么大?

Part Number: LM5022

以上为webench仿真的结果(8~12V输入,输出60V2A,pwm频率为200kHz)

按照以上参数在multisim中进行仿真,当pwm取200KHz时,仿真结果为:

一条直线,基本上就是直通,

调整频率到20KHz左右发现输出电压较高,但是波形很郁闷,如下:

请问原因是什么?