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tps54331降压芯片设计问题

Other Parts Discussed in Thread: TPS54331

你好,我采用tps54331设计电源部分,输入7-24电压,输出5v、3A的电压信号,根据提供TI网站提供的元件参数设计的板子,开路状态时候,输出的电压是5v,但是一旦加上高负载,电压急剧下降,请问是何原因造成