Questions about the working of Mosfet for switching

[movie_freak]

p channel mosfet switch

I am confused regarding the working of mosfet for switching:

till now what i completely understand is:

Case 1:
https://www.physics.udel.edu/~watson/scen103/mos4.html

Case 2:
https://www.physics.udel.edu/~watson/scen103/mos5.html


From above case two is in low-side switch configuration and case one is in high-side.


I thought that n-channel is used as high-side switch and p-channel for low-side switch..

but i later found out on google that n-channel can also be used for low-side and p-channel for high-side. This created confusions and questions..

Guys pls bare with me.. my questions can be silly cause i don't have much knowledge regarding this..
here they go:
--> Is it true that p/n type can work in both high/low configuration..
--> If both can work in both configurations why do we have two seperate mosfets..
(if this is the case the only difference that i know is the resistance provided)
--> Is there any changes or certain elements that needs to be added to a particular p/n type to work in certain high/low configuration or nothing matter any mosfet can be used in any configuration as it is..
--> Why do we need a drive to work Mosfets in H-Bridge configuration, otherwise i saw my mosfet's being burnt..


Many Thanks,
Surya

 

[btbass]

mosfet switching

In an ideal world you would have a p channel in the high side and an n channel in the low side of a bridge. The most common configuration is an n channel in both the high side and the low side. This is because n channel mosfets are more abundant and cheaper than p channel mosfets. To drive the high side mosfet, you would normally use a driver chip. These incorperate a diode capacitor bootstrap circuit to generate the voltage required to drive the high side mosfet.
The best place for information on this is to visit a manufacturer of driver chips, such as IR. They have a lot of application notes and circuits for you to use.

 

[movie_freak]

p channel mosfet switching

good info.. Thanks buddy..!!

I'll try to gather more info regarding the driver now..!!