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LM3405调节LED电流的问题

Other Parts Discussed in Thread: LM3405

Hi, 正在用LM3405设计LED调光电路,需求:5v输入,驱动4颗并联LED,最大提供40mA电流,即4*10mA. 

LM3405手册中写道:最小电流200mA,采样电阻最大1Ohm,如果我直接设置采样电阻为5ohm,会引起什么问题吗?

如果要确保不大于1ohm的采样电阻,那只能用PWM来调整,即用0-20%的占空比在200mA满幅度里调整,这样会浪费好多分辨率。