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TMS320F28033-Q1: OBC应用中,PWM输出内部晶振是否容易受到干扰

Part Number: TMS320F28033-Q1

28033用到PWM输出控制MOS,反激控制辅助电源,12V输入,12V输出,反激拓扑做OBC高低侧的隔离,输出1A,MOS管电压100V,20A,出现烧管子的情况,请帮忙分析是不是内部PWM的晶振受到干扰造成的,或者其它什么原因?谢谢