Remove the zener diode (D3). It will limit the gate voltage to 9.1 volts not enough for the mosfet total conduction.
It is the case to use a flyback diode across the motor
Al.
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Remove the zener diode (D3). It will limit the gate voltage to 9.1 volts not enough for the mosfet total conduction.
It is the case to use a flyback diode across the motor
Al.
All progress began with an idea
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Why do complicated while life could be way easier... if the goal is just to drive motor(inductive load) with PWM, the above circuit have few problem indeed. I would never use a Mosfet without a MOSFET driver IC, or without any Push-Pull setup... at least for high current load...
Still doable to use Logic level Mosfet directly connected to the PIC.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Thanks aratti and mister for your replies, I remove the zener after it's damaged and I'm putting the flyback diode , I know that IC drivers is better than I make a driver alone , but in our country It's a big problem to get IC's from any country because there are problems in ports and transportation.
Is there a professional circuit for mosfet gate driver and driver for mosfet handling 110V and 3A please help !
Last edited by iugmoh; - 5th February 2009 at 16:31.
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mosfet
aratti,
what is wrong with D3 in general ? It is good to protect gate to less than 20v although the driver is only 12v. Also I think that the free-wheeling diode across the motor has to be a FAST SWITCHING type, otherwise the diode will not totally limit the fly-back voltage to the mosfet.
don
amgen
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