Hi guys, I'm pretty new here. I have an arduino uno, a mosfet and a need to use it. I read another thread that ended in 2017 and the system encouraged me to start a new topic instead of replying to that one.
I will try to include the relevant information, but again "I'm new". If I state something that is not the case, please by all means correct me. If I say I'm using arduino uno pin 9 because it automatically operates at 980 hertz instead of 490 like most of the pwm pins, but i'm wrong for some reason.
I want to switch a meanwell power supply, specifically the HLN-40H-15B, it is part of the HLN-40H line rated at 15volts and 2.67 amps.
I have lots of questions but this is the mosfet thread, I'm intent to use 256 bit PWM via a look-up table to produce 32 levels of linearly perceived brightness. I do plan to use pin 9 due to it's higher PWM frequencey of nearly 1khz, reducing visible flicker.
the Mosfet I will be using is irlz34npbf. This was originally to switch a LM338 to power an xhp-70.2 led however the led will now be powered by the meanwell power supply (we lost access to etching and have run out of time for our school project).
My question regards the information I've been reviewing regarding how to choose my gate resistor and how this work at all.
First, I never hear it said but I wonder is it assumed everyone already knows to use a resistor from gate to ground to empty the capacitive gate when i do not send it 5v signal? or is this unnecessary and this is why it's not mentioned?
Second, what resistor do I need for this job, (the one that my output pin 9 will hook up through in series to get to the gate pin of the mosfet)
(are these even the things that refer to the capacitance of the gate?? or did I need to be looking at Qg Qgs and Qgd, measured in nanoCoulombs)???
Ciss input capacitance 880 pF
Coss output capacitance 220 pF
Crss reverse transfer capacitance 94 pF
(under conditions of Voltage Drain->source of 25v and Vgs of 0V at a 1 mhz frequency)
I'm thinking of using a 220 ohm resistor, the gave capacitance seems to be very small of the gate so this might make things acceptable for speed of response.
the pdf is really easy to find for this one but I'm happy to answer other questions.
I'll be starting another thread addressing the meanwell power-supply and how I am to use this. I often read conflicting information on datasheets, this means I do not understand what I'm reading but I think I do understand (not good).
Thanks in advance to everyone for time and assistance, I look forward to learning more stuff : )