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上图为设计电路图,但测得输出电压始终接近于输入电压,请问是什么原因所致???测得FB电压约为3.0V。参数说明:输入电压8到14V,输出3.3V,1A。由条件所限,电感用的是22uH的色环电感,,求大神帮忙,谢谢。