u/Cuberick21

Hey y'all!

This is my 7th attempt at designing a PWM driving circuit for LEDs (prior attempts on my profile). It is also just a small prototype to test the architecture I went with before placing the much more expensive order for the 9Ch version.

The main objectives of this driver are:

- up to 75kHz switching (realistically about 30kHz in operation but head room doesn't hurt)

- 5A max per Output (fused with 8A on this board to save on different components) at 24V

- DMX in and through with MAX485 for communication to the ESP which is mounted on female headers to allow for swapping.

- Heat sink on the bottom below the LM2596 for heat dissipation (proof of concept because I have the heat sinks laying around in bulk anyways)

The stupid looking resistor chains are there in order to save on PCBA loading fees and the amount of space I have on this board as it is quite low density.

Please also excuse the messy schematic, it has grown over the revisions and I have honestly been too lazy to make it really pretty.

Thanks a lot in advance for helping me with this project :)

PS: Silkscreen art is still missing but will be added of course :D