I just have a fairly simple application for a small model solar car. I'm trying to design a simple MPPT circuit using a buck converter, MOSFET, and switcher IC, which will convert a 12V solar panel to a 6V motor. The optimum voltage seems to be at 17V from my experiments, so I was really hoping to track only the voltage. What would you recommend for the overall system design (buck converter, MOSFET type, and recommended switcher IC). Thanks a lot for your help!!