Hello there, i am making a DC-DC Buck from a switching 24Vdc commercial PSU to a 5Vdc for an Arduino Uno, but there are some options such lm7805 and lm2576 (if you know a better one please let me know down below), id like to know if you guys have done this before and which one would provide my Arduino more stability and less noise.
Thank you all in advance.
Making buck converters is not easy. They run at high frequency and therefore board layout is of crucial importance...
What would you use instead?
A ready made board may be cheaper than the loose components...
This one is 10 USD....
And polulu brand is often advertised here as good...
The 7805 is a linear regular, similar to what's already on the Uno board, but maybe with more power & current handling capability. It's super easy to use, only requiring a couple of capacitors. But like any linear regulator, energy is wasted heat and when dropping lots of voltage (like going from 24 to 5V) it can overheat and shut down at lower-than-rated current. It is thermally protected and it rarely burns-up & permanently dies...
The 2576 is a switch-mode regulator which is very efficient so it can handle more voltage-drop and more current with less heat. But it's trickier to build and it requires an inductor.
Both can be pretty good but I don't know if they are better than the Uno's on-board regulator.
I have the skills to build a buck or boost (or combo) regulator but don't do it. There are so many prebuilt ones available at reasonable cost it is not worth my time to do so.
Only if I needed some strange features that commercially available ones didn't have would I bother to build my own.