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设计的TPS5430做的负电源,输出电压不能调调节,且恒定在-2.5V

电感实际用的是22uf, R2用的是203,调试时将R1从10K换成3.3K后输出电压变成了-2.7V,但不管怎么调节R2,得到的输出电压也只有不到100mv的变化。测试第四脚时,发现只有一两百毫伏的对地电压,请大家帮我一下,调试大半天了