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关于UCC28083D芯片8脚VDD击穿



我申请了20个样片,全部都是8脚击穿,VDD在启动时,重启三次后Vdd直接拉到零伏,用万用表测试8脚对地短路,当时重启电压大概是12.6V,请专家分析原因,多谢!