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LM3478频率问题

Other Parts Discussed in Thread: LM3478

请教一下各位,

在手册中,LM3478 中决定频率的是由 Rfa 这个电阻决定的,

       公式如下:

        

 

         但实际测试时, Rfa=150k-ohm 时,fs = 125K-Hz ;

         但理论计算时,当fs = 125K-Hz 时,理论电阻应该为 170k-ohm 

电阻值是1%的精度,不知道为什么会出现这样的现象?