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LM3480-3.3输出降低!输出负载为100欧姆,输入电压超过26V后,输出电压仅为1.7V左右,是什么原因呢?

如题,按照datasheet的典型电路搭建了电源部分,输出通过100欧姆电阻接地作为负载,输入电压不到26V时,输出能达到稳定的3.3V,输入电压超过26V后,输出电压仅为1.7V左右,这是为什么呢?