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UC3846DW开机上电波形问题,急求解决

Other Parts Discussed in Thread: UC3846

UC3846DW芯片11,14脚开机上电时触发捕捉到的输出波形如图:造成开机上电立即烧坏MOSFET,此芯片用在推挽DC-DC高频40KHZ升压电路,急求TI工程师帮忙分析解决,