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UCC27211带NMOS时烧毁

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Other Parts Discussed in Thread: UCC27211

UCC27211能不能这样用,驱动一个BUCK-BOOST电路的MOS(PWM单片机产生):

 

第一片UCC27211,PWM输入后2-3秒后烧毁,怀疑是散热焊盘与其他引脚短路。但是在没有输入PWM的时候试用上电,摸上去没有任何温度。

 

第二片,在散热焊盘贴上耐高温胶布再焊到转接板上,在10%PWM时正常(输出波形正常,振荡有点大没,没在G极串电阻),但是PWM加到95%马上烧。

测试电路原理图: