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LM5022芯片和MOS管严重发热

Other Parts Discussed in Thread: LM5022, CSD19506KTT

       最近用LM5022搭了一个输入18V~36V,输出电压60V,输出电流2A的电路,电路参数是按照WEBENCH设计得到的,电路如下所示:      但是测试时发现,输出电压正常稳定,芯片和MOS管带轻载在启动十几秒之后就严重发热,我用的MOS管是CSD19506KTT,二极管是MBR30100, 示波器测得驱动PWM波如下:

    后面好像是发生振荡的样子,请问是因为这个导致芯片和MOS管严重发热么,该怎么改呢?