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TPS63020轻负载时输出电压高于设置电压的原因

Other Parts Discussed in Thread: TPS63020

通过分压电阻(两个分压电阻分别为910K-1%和150K-1%)设置输出电压为3.54V,用直流稳压电源供电,TPS63020的输入电压在2.5-4.5V之间,测量TPS63020在空载时的输出电压为3.68V(与设置的3.54V不一致)。当负载电流达到300mA以上时,输出电压降为3.54V(与设置电压一致),此时加大负载电流,当负载电流1.5A以左右时(输入电压在2.5-4.5V变化),输出电压可以维持在3.54V。当输出电流超过1.5A时,输出电压开始跌落。

请问负载电流较小时,为什么输出电压为3.68V(与设置的3.54V电压不一致)?