Mosfet Motor Driving

[samarsingla]

Hi
I want to drive a dc motor in simgle direction but control its speed. I want to use a mosfet with pulse width modulation. Please can someone tell me how the protection diode is to be connected?
Thanx.

 

[Styx]

have the FET as a low-side drive and put the diode across the motor cathode at +VE rail

have a look for simple chopper cct's, effectively a machine can be treated as an inductor thus the simple low-side drive chopper cct with anti-parallel diode to provide freewheel path is valid

 

[samarsingla]

actualy I am a beginner and didnt get much of what you said.. sorry..

 

[Styx]

If you use the search function you will find many a thread about DC-voltage control, brushed-DC machine control, freewheel diode, Chopper ccts and protection diodes

here is a start
https://www.electro-tech-online.com...fet-internal-diode.21902/?highlight=freewheel

I even posted a picture/circuit in this one

 

[Hero999]

Please do not make more than one thread asking the same question.

https://www.electro-tech-online.com/threads/irf540n.23575/