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ucc27211的使用问题

各位大神,我这个驱动电路,上管Q1,始终是导通的不关闭是什么原因啊,测量了也没坏!是不是C7 电容太小了造成的
换了电容,换了Q1 (IRF 730A),换了芯片,都是一样!崩溃了!