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TPSM53603不能输出3A电流的问题

Other Parts Discussed in Thread: TPSM53603

按照手册制板贴件后能不加负载时输出5v电压,如图加上2.2水泥电阻(200W),测量输出端电压直接从5V掉到了4.66V。按计算5/2.2=2.272A。离输出3A还差得远,不应该把5v拉低,难道说TPSM53603连2.3A都输不出来?很困惑,想问问到底是哪里的问题?盼解惑。