i get question in interview ask me to design power supply using fet and TL431 AND RESISTORS AND CAPACITORS THE OUT PUT VARY FROM 0 TO 120VDC AND INPUT IS DC IS 200VDC AND THE LOAD IS R//C THE VALUE OF R IS 25K AND C IS 100MF AND OUT PUT CURRENT IS 2A CAN SOME ONE HELP ME HOW TO DESIGN THIS CIRCUIT