MOSFET High side and low side applications

[Afla]

probably you people have heared about

MOSFET high side switch (drain is connected to +ve and load is taken from source)



MOSFET low side switch (load is taken from drain and source is connected to ground)

i want to know, what are the typical applications using MOSFET in both above cases ?


thanks

 

[KlausST]

Hi,

..and you can also use a Pchannel FET for highside switching, then you don`t need a charge pump.

***
N-Ch FETs are more common and easy to drive. There are logic level MOSFETS that can be directely driven by a 5V or even 3.3V logic output.

But in cars you have a common "minus" system. All the chassis is connected to minus. Here it makes more sense to switch the high side. One wire swiched high side to load, and return via chassis.

***

Klaus

 

[BradtheRad]

By mixing N and P devices, you can drive these from a single clock:

The half-bridge alternately provides paths to supply and ground.

The H-bridge can turn single-supply DC into AC.