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请问,TPS61240开机后电压上不去,现象很奇怪

Other Parts Discussed in Thread: TPS61240

我用两节干电池串联输入,输出5V给传感器供电,传感器电流30mA,为啥电压上不去?不是5V而是3V多,手册里说电感1uH,我加到4.7uH后还是不行。

另外,有个奇怪的现象,如果先把传感器断电,再打开TPS61240,等升压到5V后再接入传感器,这时电压能保持在5V,但电感有啸叫。问题是我传感器功耗太大吗?但30mA给这个芯片是够用的啊