Buck converter, mosfet choise

Other Hardware General Electronics
3

  1. What are you using to control the MOSFET?
    1a) What voltage does that controller put out? The IRFB4110 is a standard voltage MOSFET, ie, you're supposed to put ~12v on the gate. If you want to ocntrol it with something that only puts out 5v, you need to use a logic level MOSFET (or use additional components like a gate driver or other transistors).

  2. What input voltage?

  3. What output voltage?

  4. What output current?

If you do not know the answer to any of these questions, you need to figure that out before selecting a MOSFET.