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我在做无线充电应用。我按照BQ51013EVM-725 来做的板,元件参数也是参照 资料上的物料清单来焊接的。现在我测试得到的输出电压随输出电流的增加变化很大。空载时输出电压5.03V,但输出电流0.45A 时电压降到了4.9V,输出电流增加到0.8V时,输出电压才4.4V,而且输出电流不能达到1A,我用来设置电流的电阻是220欧姆。请帮我分析一下原因,以及需要怎样对策,谢谢!