best choise of mosfet

[Magdy_said]

i know there are many explanations on the internet for the difference between n,p channel mosfets, i read many of them but still can't decide which is best to use in a simple buck converter circuit? will dopping of mosfet will have major difference in the behaviour of voltage and current or it's all concerning the frequency which the mosfet working with?

 

[KlausST]

Hi,

N-channel, P-channel, which one is better?
Right hand, left hand, which one is better?

Usually one uses N-channel, thus there are more different N-channel than P-channel.
But you may use P-channel, too

Klaus

 

[asdf44]

N-channels are unambiguously 'better' all else equal but usually all else isn't equal. N fets used on the 'high side' for example are typically harder to drive. Whether its worth it to add special circuitry to realize the benefits of an N-fet vs P-fet isn't something we can tell you.

 

[BradtheRad]

simple buck converter

If you use N device then the straightforward arrangement is to locate the converter portion near the positive supply rail (that is, high side).

But what if you wish to sense voltage and/or current? That becomes awkward when it's referenced to the positive rail.

Therefore your choice may be guided by other factors such as where to place things such as voltage sensing or current sensing.