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LM5088HM-1工作不正常,输出电压波形为三角锯齿波!

使用WEBANCH生成的原理图。电源参数为输入:24-60V 输出12V 2A

电压输出波形如图(滤波后):

NMOS的G和S脚波形一样,如图:

原理图和PCB如下:

其中电容C134试过27nf和100nf均无效果。

求指点!多谢~!