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ths3001怎么那么容易就自激了,求解,下面附上pcb和原理图



附件里的pcb图没敷铜,测量时用的是普通的杜邦线不知道影响大不大,以前一直做电机控制类,对这类不是很熟悉,求指教,自激频率20——30M,芯片发烫严重,