求助升压IC

谁知道后面的FB输出端的电阻电容值怎么确定的啊?
公式有,RFB1和RFB2可以确定,CFB怎么确定啊?
RFB:Set up so that RFB1/RFB2=(Vout-3.3)/3.3 (Vout=set-up output voltage),
Please use with RFB1 +RFB2≤2M Ω
CFB:Set up that Fzfb=1/(2×π×CFB×RFB1) is within the Adjustments necessary in respect of L,CL.
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