I'm currently working on a project where I need to be able to switch 7m of 9W/m LED strip (connected from both sides) using an Arduino with PWM. So the power of the led strip is about 63W at 12V. I have a plenty of IRF540N mosfets lying around but I need to calculate if I need a heatsink, or not. The intended circuit looks like this:
Note that I don't want the high current to flow on the tiny PCB traces, that's the purpose of the screw terminal.
I know that a logic level MOSFET would be better, but if I understand the datasheet correctly, IRF540N should be able to switch even much higher currents with 5V at the gate than I need. Or would using e.g. IRL540N make any difference?
Do I need a heatsink? If so, how to choose one properly? Is there anything else I should be worried of considering my circuit? Thanks in advance!