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输出电压接入负载之后下降严重

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电压在不焊接F1保险丝的时候测得R32的上端电压为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?