I am building my first simple buck converter, stepping down 12 V to 5 V and driving a small load of 5 Ω - 10 Ω. Something like the following:
The above images both show an N-channel MOSFET. I am confused as to what would be the best option to drive the N-channel MOSFET at a 10 kHz switching frequency, keeping in mind the above parameters.
I have read here, that for an N-channel MOSFET a special drive circuit may be required to turn the transistor ON, so a P-channel MOSFET may be easier to implement.
As for the gate-driver I have seen plenty, and a popular, cost-effective circuit seems to incorporate a non-inverting totem-pole driver as shown.
I was thinking whether the above circuit would be good in my case, and simply give the PWM pulse at
- What would be a suitable gate driving IC for an N-channel MOSFET, and why?
- IF a P-channel MOSFET is more suited for this application, then I would go for the least 'complex' solution and use a P-channel MOSFET. What would be a suitable P-channel drive circuit/IC?
I have never designed something like this before, so please keep this in mind :) Any tips and/or suggestions would be appreciated!
Edit: Just for clarification.
- Cost is not an issue in this case.
- Simpler design (fewer parts) is better.