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疑问:TPS40200的典型电路中,R1和R4是有什么作用?

使用工具设计的值分别是2KΩ和10Ω,如图:

不知道这两个电阻有什么用,手册里没有地方提到过。可能20mΩ太小了,我设计的PCB即使把Rsense用焊锡短接了仍然在输出电流仅仅0.22A的时候就停止工作了,我想把7、8引脚短接。