SDG #111 RGB LED Tape Driver with PCBs from JLCPCB - Lighting Controller Project Part 9

Part 9 of the ongoing lighting controller series shifts from the control side to the output side, with a dedicated RGB LED tape driver board built on freshly fabricated prototype PCBs. The goal here is a module that can take PWM signals from the main controller and switch high current 12V or 24V analogue RGB tape cleanly, without the flicker, overheating or channel crosstalk that plagues cheap off the shelf strip controllers.

The build walks through the reasoning behind the design choices rather than just the assembly: low side N-channel MOSFET switching per colour channel, gate drive considerations so the devices turn on and off fast enough to keep dissipation low at higher PWM frequencies, and layout decisions such as wide current paths, sensible connector placement and keeping switching noise away from the logic side. Because the board is one piece of a modular system, the interface between this driver and the rest of the controller matters as much as the power stage itself.

Assembly is done at the bench with a temperature controlled iron and microscope work for the smaller passives, which is a good illustration of how a fairly simple driver board still benefits from proper tooling and inspection. Once populated, the board is powered up and driven to confirm each channel responds correctly and that the MOSFETs stay cool under realistic load.

For anyone planning their own LED lighting project, the useful takeaway is that a custom driver board is inexpensive to fabricate and gives you control over PWM behaviour, current capacity and mechanical fit that a generic module simply cannot match.