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接上负载输出电压掉很多

Other Parts Discussed in Thread: TPS54231

用TPS54231接了个电路,输入是13V,输出是5V,不接负载时,用万用表量输出电压是4.99V,可一接上负载,马上掉到2V以下,这可能是什么原因啊。电路是照着datasheet上搭的