Last visit to my preferred supplier I picked up a couple of IRL520N logic level mosfets. I've never used a mosfet before.If I want to use one connected to an Arduino digital output does it need a current limiting resistor on the base oops I mean gate?
However, that is completely wrong.
The input capacitance of the fet is 450pF, so you may (can?, able to?) calculate easily what is the max charge/discharge current for a certain speed of a falling/rising signal edge
Actually, it should not be a 10k gate to source, but Arduino output to ground. You do not want a potential divider - however minor - between the Arduino and the FET.
If you work in electronics for some time you are maybe aware of something called "good engineering practice".If Atmel claims the max i/o current is 20mA, then the good practice is to limit the current to be less than 20mA under any conditions.The input capacitance of the fet is 450pF, so you may (can?, able to?) calculate easily what is the max charge/discharge current for a certain speed of a falling/rising signal edge
You can overload a pin by vaporizing the metalization like a fuse, not just byoverheating an output transistor. If the datasheet says absolute maximum 40mA,that's all you have to go on (without clarification from the manufacturer).There is also a mechnism of slow degradation by overcurrent in ICs calledelectromigration. Moral - use those gate resistors. If you want more current to the MOSFET gateuse a MOSFET driver.
I've said that before, and inexplicably had people jump down my throat for it.
Found this link on Mr. Gammon's site: link
Are you saying this is wrong?