P Channel MOSFETs neatly solve the problem of not wanting to break up the common ground line. But they have their own issues.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Wouldn't the mosfet only need to dissipate just under a half watt when lighting that 55W bulb? That should be fine even without a heatsink on a TO-220
The reason for higher Resistance R(DS, on) in a P-channel over an N-channel MOSFET is very simply due to the design geometry of the internals. N-channel designs involve a straight-through geometry and shorter path, therefore a lower throughout resistance than the P-channel type which inherently forces the current through a not-so-straight and longer path. You are keen to hypothesize about the difference in diffusion of holes vs electrons, but in fact the real explanation is quite simpler and requires no invocation of Quantum Mechanical effects. Happy Days my friends!
Thank you so much for this tutorial!
Thank you again.
Hi
This is the most ammmmmatureist turorial I have ever watched.
Are you a school child ?
It is not even worth watching any other !
MAYBE 20 years ago it was OK.
Thank you for making this mosfet tutorial playlist! I have referenced it many times these videos were exactly what I needed to see as I am looking to use n & p channel mosfets with the fuel pump, radiator fans, and headlights on my motorcycle.
I ordered some IRF4095's and IRF3205's they arrived in the mail today I was eager to test them out with a 55w H7 headlight connected to a power supply and they work as intended.
I have a question , P channel mosfet is used with a opto couple or the Mass is connected to Vcc and Gate pin is controlled by a voltage with an opposite direction
I have a problem with P channel mosfet It seem difficultly to use as a PNP Bjt. I think it must set Vgs =or < Vgs(max) with Rdson, e.g IRF4905 Vgs(Th)=-4V it maybe damaged when the Gate pin is connected to Vcc. It is true,is not it?
Oooooh, he's building suspense again. Will the little piggy go to the market or will it stop and buy some magical beans and get slaughtered by the nasty P channel Giant? Come back next week same Bat Time, same Bat Channel!
body diode is to protect the MOSFET from reverse voltage spikes when switching inductive loads. referred to as a"damper" diode. also found across relay coils to protect driving transistors.
It seems that materials for P channel are not in perfect duality and not symmetrical in performance. Nice observation
Dude, seriously… thanks 🙂