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tps61088升压无法输出2A以上电流

Other Parts Discussed in Thread: TPS61088

你好,我用的官方demo板,修改了一下反馈电阻,5V转11V,输入是稳压电源,电流能力10A,没有设置限流,输出无法达到2A以上,负载重的时候输出电压变低,把输入电压也会拉低到3V,同时板子有响声,请问这是什么原因?