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TLV62569: Feedback resistor and feed forward cap setting

Part Number: TLV62569

Hi team,

I have two questions which are showing as below. I set the Vout = 0.9V. 


For Vout setting, it's better to fix the bottom side feedback resistor=100k or top side feedback resistor=100k.


If I set top side= 49.9k and bottom side = 100k and we have already fine tuned the suitable Cff, if I change the feedback resistance but same ratio which I mean Rtop = 100k and Rbot = 200k. Should I need to re-fine tune the Cff?