im having some trouble with DC converters in a solar system. I have a solar panel of 21V (Voc) and 1.33 (Isc). I have studied that with a DC buck converter with input regulation (Feedback loop taken from the input) would result in a fixed output and equal to the MPP.
The thing is that i have a LM2596 adjustable regulator , and i was thinking about soldering the resistor divider taken from the output of the original topology, and take the input as a source. Could I get the MPP voltage and current? If yes, how could i calculate?
I attach the datasheet from Texas. http://www.ti.com/lit/ds/symlink/lm2596.pdf
Original Topology from Texas \
Edit: The objetive is to charge a battery pack of 3 Li-Ion cells efficiently, firstly mppt step is where my doubts are.