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.
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
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