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LM5117做的DC-DC,开机瞬间有高电压输出

Other Parts Discussed in Thread: LM5117

我用LM5117设计DC-DC,输入26.5v,输出19v,现在发现开机瞬间会输出27V电压,稳定后正常输出19v,连续开关输入电压,输出不会出现高电压,只要一段时间后再开机,又会出现高电压输出,什么原因呢?