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MC34063按照官网5v转化为-12v,但是输出却为3.1v

大家好,电路按照官网做的,但是输出却是3.1v怎么也没有负电压产生,我电感L用的是82uh,100uh的也试过,不知道怎么回事,红色的标注是我在电路板上测出来的拐脚的电压值