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Then indeed the FET will open but it cannot go above 5Volt irl520nn the source, because then it will close again as the VGStsh is around Looking at the curve, at a gate to source voltage of 5V the IRF is hardly turned on. At 8A it is not even breaking a sweat.

The only conditions are it should have high switching speed so low rds on and high break down voltage. Good luck, but dont hesitate to ask again shld you need further advice. That indeed is odd and I start to wonder if it is the IRL that is shutting down or something datxsheet. I presume you are aware of the designcriteria of an H-bridge and the chances of shorting your PSU if you dont do the switching correctly. However it has a very low Rdson. Say that is 2 Volt. But if it is working for you, that is good.

IRL520N Datasheet PDF

But to be sure i had a question. I am not sure if there is an easier way to do it.


What i like you to do dataxheet is to detach the pic-circuit and just put 5 Volt on the entrance of yr FET circuit, via say that ohm resistor, and see if then your lamp behaves the same. If you come up with an idea I would be happy to hear it. Is this what you mean?

What kind of lamp is it? Glad to be able to contribute!

The relatively cheap BUZ11 is also an option. I noticed that irl5220n range is very low. As there is an LED in the source to ground i presumethere is already a voltage drop, keeping the source above ground. But in reality you dont need that formula as it mainly has to do with the range wherein the FET DrainSource acts as a pure resistor.

[Solved]IRLN pinout

Maybe you alreadymeasured it but just to make sure, when your problem aises, have you measured if there is still voltage on the gate or even voltage on your PSU? I should turn on a load some LED lamps in paralel with a Mosfet. Normally the impedance of a FET is high enough to not lose any signal over that resistor. It shows the same behaviour when I use 3. The IRF can obviously take 4 amps, but sadly it expects a higher voltage on its gate than the most microcontrollers can deliver i presume you will use a microcontroller.

This actually is used for heatedbed in 3D printers up to A. It doesnt look dedicated to a steppermotor though, more to drive a rgular DC motor.


IRL520N Datasheet PDF – IRF

Every time I tried with new IRF, but any of them worked only for first time. The gate source resistor is purely to make a predefined state and to avoid the entrance to float I do not know the PIC18F that well, but what is important is the Output voltage it has on its pins.

But where can I find K in the datasheet? Some people however have trouble reading a datasheet or do not know what to look for and in that case foing with TTL level FETs is a safe option. Good luck with jrl520n project. This is for direct transfer so it is already mirrorred the right way. If you feed it with 15Volt the output voltage is around volt which will do the job. Perhaps it is datashet lose wire or something.

IRLN Datasheet(PDF) – International Rectifier

Thank you for this very good explanation. The driver will have only 2 inputs, allowing off, fw, rev and brake.

Learn how your comment data is processed. The transistor may burnt. Oh i fully agree David. Thanks — You are correct. The input capacitance is best chosen as low as possible. Whats about this, I have check in the datasheet and seems to datasheft very well at TTL levels even with a lot of Amps.