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菜鸟问:LM2596-5.0v 设计输出负-5v电源,输出电压的问题

Other Parts Discussed in Thread: LM2596, LM25576

上图是根据芯片的datasheet上的负5v电源输出画的。

但是实际输入电压是12V时,用万用表直接测量2脚和3脚之间,2脚接负,3接正,结果电压为-11v左右;

然后在测量过电感之后的,同样3接正,电感后接负,电压只有-0.7v左右。

请帮忙看看,是怎么回事?