R1 question for LM2576 buck

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Chillum

Joined Nov 13, 2014
546
Hi, I want to build a 36V LM2576 buck, I selected my resistor R1 at 750R, because I can get R2 VAR 22K (and already bought the pots), but now I see datasheet says R1 minimum 1K, what will happen if I use a 750R?
http://appnote.avrportal.com/calculator/lm2575

Moderators note: removed brackets, as they lead to an error page
 

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