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TPS7A3001

现在的问题是我输入-12V输出电压为-6.4V,而且不稳定,经常会出现突然没有输出的情况。而且我尝试过将输入递减,由-12降至-5V,它的输出就会由-6.4V降-5V,在输入为-5V时,输出为很稳定的-5V。现在就是搞不明白它是怎么回事。我现在的目的是想让它输入-12V,输出-5V。原理图如下