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TPS7A94: 电容影响输出电压的大小是为什么,

Part Number: TPS7A94

 如图所示电路,3.8转3.3V电压时只能输出2.3V,只有将C71这个4.7uf的电容去掉才能输出3.3V,如果将C71更换成1uf或者0.1uf更小的电容,会输出3.17V的电压,将EN/UV引脚和FB_PG引脚的电阻调整多次改变电压,输出也没有任何变化,请问c71这个4.7uf的电容有什么影响吗,为什么会这样