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LM26420X电源3.3V输出不正确

我们用的5V转3.3V和1.2V,刚测量时芯片特别烫,3.3V输出测量值为1V,反馈电阻为31.6K没错,刚开始用的磁珠,后来换为3.3UH的电感依然不行,但没有那么烫了,3.3V输出值不对,而且纹波特别大,请教这是哪出了问题