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UCC28950炸管

Other Parts Discussed in Thread: UCC28950

请问,功率1000W;DC300V转DC14V,驱动部分、mos管型号和评估板一样,死区时间实测200ns,加300V电压,空载,上电就烧mos,四个管全部击穿,后臂上管的泄放二极管击穿,请问这有可能是什么原因。还有我们做单片机控制,是先上高压电还是应该先让28950工作?谢谢