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LM2575XS-5.0的4脚对地阻值



大家好,我根据规格书的设定知道5V,R2=3.12K,那么用万用表测试3和4脚的阻值应该是4.2K左右,我现在用的14年批号料是这个阻值,用16年批号的却是9.01k,15年批号的,是4.2K和9.01K混合的,我想知道这个是什么原因造成的?