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用mc34063设计输出24V,当输入为5v时，输出是24v,当输入改为8v时，输出就变成30ｖ了，量了５脚的电压，５ｖ时，是１.３ｖ，８ｖ时，近１.６ｖ。将电感换成２２０ｕｈ，还是不对，附电路图，求解释，谢谢
