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关于LM3410作为恒流驱动LED的问题。

Other Parts Discussed in Thread: LM3401

Hi

我使用LM3410XMF驱动单个UV LED,LED的IF=1.2A,VF=3.85V,当我输入电压给到3.6V时,输出的电流非常小,测得Vfb上的电压只有几十毫伏。当我输入电压给到5.2V时,Vfb大概是180mV。与LED串联的电阻我用的是160毫欧,按理说输出电流应该是190mV/160mohm=1.18A,可是为什么输入电压较小时,就不能满足这个电流呢?thanks!