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TPS51200的问题

Other Parts Discussed in Thread: TPS51200

大家好,下面是我的TPS51200的原理图,但是最终输出是个20Hz左右的方波,VD幅度是750mv,高电平的占空比是70%左右,VREF_OUT也是方波,VREF_IN是750mv的直流电平,EN管脚3.3V,PGOOD的电压也是方波,不知是什么问题