flywheel diode

[iugmoh]

I want to ask where I can put the flywheel protection diode across the winding motor or across (D-S) of mosfet and why , beacuse I damaged many mosfets and want to know what is the problem ?

[sayzer]

Check This circuit.



http://www.picbasic.co.uk/forum/attachment.php?attachmentid=3268&stc=1&d=1237827587 (http://www.picbasic.co.uk/forum/attachment.php?attachmentid=3268&stc=1&d=1237827587)




I want to ask where I can put the flywheel protection diode across the winding motor or across (D-S) of mosfet and why , beacuse I damaged many mosfets and want to know what is the problem ?

[iugmoh]

oky I build the same circuit but without the pull down resistor and I add a 7 ohm resistor between the gate driver circuit and mosfet gate. But it's important to add a snubber circuit ?

[mackrackit]

I want to ask where I can put the flywheel protection diode across the winding motor or across (D-S) of mosfet and why , beacuse I damaged many mosfets and want to know what is the problem ?
The why part..
Think of an inductive load as an electrical spring. When the electrical pressure is released (turned off ) the current will reverse for a bit. The reverse current is what damages the MOSFET.