Many thanks Anston, i have used Webench tool in this day and it's pretty helpful, but i have two problems:
i would have the possibility to regulate output voltage by trimmer, if i set by pot the output voltage divider without changing tha Caps value, what happens?
Regulating Vout there is the possibility that Vin >= Vout, so if i've understood i must use a buck/boost, correct?
thanks lot
Enzo