Electronics > Projects, Designs, and Technical Stuff
Is this MOSFET driver circuit ok?
Chriss:
Hi!
I'm working on a small project where I have to achieve to control an injector solenoid with 3ms ON and 10ms OFF signal.
I should also have the ability to speed up and slow down the pulse but not to affect the 3ms ON time.
That part is ok for me, I did it with an Attiny85...
The input voltage is 12V and the injector consume around 2A current.
If this is needed.
What about I care, is the part where I drive the MOSFET.
Is this circuit good enough to handle the task?
Maybe some suggestion to improve this section or any other ?
I would appreciate any idea and help how to make my circuit/hardware more stable.
I have to say, I realized the whole project and it is working well, but I'm also wish to have some info from
you guys who are dealing with electronics design every day or from technicians who are more in this stuff then I.
Thank you very much.
My best regards.
silverback:
Hi, there should be NO connection between the opto coupler collector and the FET drain, turn off time can be improved by using an additional Zener in the fly back diode. This increases the voltage at fly back therefore reducing the off time.
Chriss:
Thank you for your time.
Can you pls show me maybe a right way how to connect the fet with the opto the right way?
I'm also a bit confused with that part, so a schematic about how to connect it would be nice.
Thank you.
My best regards.
Chriss:
Ok.
I decided the collector from the opto to connect to the 12v but cut the trace between the collector and the fet. The LED2 would be still connected to the fet, to have a visual feed back about the speed of the fet on/off state.
Would this be a good mod?
Thank you.
Etesla:
I am not sure what you mean by connecting the LED to the fet, but the rest of it sounded OK. In an Ideal world I think your circuit would look like this.
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