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用TI的TPS63020升压芯片只能输出1.8~2.2v电压

Other Parts Discussed in Thread: TPS63020

我用的TPS63020是按照输入电容和输出电容用的是10uF,还有200K的电阻和1.5uH的电感。为什么只能输出2.2v,调的时候是1.8V到2.2这个幅度。求指导,很急。