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连上负载之后电压下降严重

Other Parts Discussed in Thread: TPS563209

根据TPS563209的数据手册给的参考电路来设计了自己的电路,如图所示

发现5V电压在不练F1保险丝的时候测得为5.6伏,连上保险丝加上负载之后就变成了2.4V,不知道是哪里出了问题,不知道有人是否知道可能是什么问题导致的?