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LMZ14203: LMZ14203启动问题

Part Number: LMZ14203

用可调直流电源给LMZ14203电路供电,可调直流源电流设置的值为1A,在上电时由于有冲击,将可调直流源电压拉了下来,当第二次上电时LMZ14203就无法使能了,请问这是什么原因?电路图如下图所示