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TPS61040的问题

Other Parts Discussed in Thread: TPS61040

用TPS61040将3.3V电压升到12V给OLED显示屏供电。现在的问题是其输出电流不正常。OLED工作电流在20mA左右,但升压芯片的电流达到50mA左右。为了测试问题,将TPS61040的输出12V电压带上一个520欧的负载电阻,测量电流发现达到了100多mA,这是怎么回事?

根据负载电阻,电流是能知道的,怎么差距这么大?

注:外围器件都是按技术手册的基本应用电路接的。