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huttojb said:The mosFET has a diode already in it so would this protect it?
Agreed and besides, even if this diode could handle the 2 Amp from the EPS when the FET is turned off, it is in the wrong direction to protect the FET from the back EMF.Nigel Goodwin said:No, it's not 'really' a diode, it's just a byproduct of the manufacturing process, add an external diode!.
ljcox said:Agreed and besides, even if this diode could handle the 2 Amp from the EPS when the FET is turned off, it is in the wrong direction to protect the FET from the back EMF.
Because I understand inductance.huttojb said:How are you aware these products come from the EPS???
Yeshuttojb said:So I diode will need to be fitted . I'll have to put that in my design.
Thanks, some don't bother.huttojb said:I'm putting a board together now and have managed to drive the FET so this looks good so far, I'll keep you informed in my progress.
See the circuit I posted on 17 Marchhuttojb said:Hello.
Where do I put this diode, what direction do I put it in and whats the best diode to use???
jason
You're welcome. Yes, the diode limits the back EMF to about 0.7 ~ 1 Volt and therefore protects the MOSFET.huttojb said:So across the MPS.
Thank you
I can't calculate the decay time since I don't know the inductance of the MPS.huttojb said:The 1N4148 can rate at 4A for 1:mu: S and 1A at 1mS, would this be OK.