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TMS320F280023: 仿LaunchPad 280025板,出现3.3V供电电压过流问题,

Part Number: TMS320F280023

输入3.3V 供电,缓慢调高电压电压,输入电压在1.7V以上,电流突然变大到1A左右,以下是原理图,请问这是什么问题,

一开始怀疑是 VREFHI 不能接到3.3V,挑起这个引脚后,问题任然有。