Hi, I'm in the middle of building a motor speed control using Arduino and MOSFET. I was following the instructions given in this Arduino DC motor speed control project. In that, they have used the IRFZ44n. But it is not a logic-level MOSFET. In the video, they show it working. But don't we need a logic level MOSFET when we are using such low voltage to drive the MOSFET? Such as the logic level variant IRLZ44n. Or is it ok to use the normal MOSFET? Will it get damaged? Kindly please help me with it. Thank you.
Yes.
Many of those videos are totally bogus.
The author of that video knows nothing about MOSFETs
An IRLZ44N will work with a 5V gate signal.
What currents are you switching?
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Hi, thanks for the reply. I'm using it to control a 775 motor. So the current may be under 15A. I have also bought speed controller modules, which use 555 timers. I checked and they are running the timer at 5V and the used MOSFET is also not logic level. I'm just asking because the logic-level ones are a bit hard to get at the local market. Thank you.
Which MOSFET were they using?
What voltage are you using for the motor?
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The article notes, "There might be a case where the selected MOSFET does not support a 5V input. In that case, you must incorporate a MOSFET driver circuit.
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They are using IRF3206.
The gate threshold voltage for that MOSFET can be anywhere between 2V and 4 V and will vary from one MOSFET to the next. They just got lucky and happened to get one with the lower voltage. You may not be so lucky and get one with the higher voltage that will not give you a low Rds(on)
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What voltage are you using for the motor?
I can show you how to use any MOSFET
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They go to great lengths in that article that you linked to, to tell you you need to use a logic level MOSFET such as the IRLZ44N.
In the video on that webpage you can even see the writing on the MOSFET when he holds it up.
It clearly says IRLZ44N.
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hi, the motor runs on 24V.
Hi, sorry I mistakenly linked the wrong article. I was following an other article and got confused about the MOSFET. And searched about using the logic level FET and came across the project I linked. So I wanted to verify that, to wether to use the IRL version or the IRF version.
Hi, sorry for the confusion. Linked the wrong article.
Where is the link to the one that you intended ?
So can you buy the IRLZ44N or not?
I won't tell you to use it if it's not available to you
Do you have a "driver stage" design ready to go?
Hi, here is the link.
I think rather than wasting all of you time its better to find a source for logic level MOSFET, or use a driver stage instead of driving it directly. Thanks for your help .
Actually I was trying to drive it directly without any additional driver stages. That's why the question raised, wether to use logic level or is it ok to use normal MOSFET.
