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LM3429: Board Layout Feedback for 60W LED Driver Design

Maxwell A. Smith
Prodigy 20 points
Part Number: LM3429
Other Parts Discussed in Thread: TPS54202

I would like to get some feedback on my PCB design, a critique if you will. This design uses the LM3429, as well as the TPS54202 for fan power.


In particular I would like to get an idea if this board is "Good, Bad, or Ugly". I've tried to minimize the current path from Q1/D1/R7 etc to as short as I can and have a big ground plane. with plenty of via stitching.

Output is ~1.1A at 60v with input being 19V at ~3.5A

This board will be the second revision, the first works OK but needed a couple tweaks, mainly a bit more heat sinking on Q1 (thermal vias added), as well as fixing a couple errors with the ground pour that causes some EMI issues. So ultimately I am just looking for some feedback to get an idea of how my layout skills are comparatively to what is expected in a professional setting.

Thanks!

  • 0
    TI__Mastermind 25500 points

    Hello Maxwell,

    Your layout looks pretty good. I would probably put a few more vias near the output cap grounds to the ground plane. I also cannot tell what kind of inductor you are using but it looks like it is through hole. It isn't always necessary but I would recommend a shielded inductor, particularly since you are spanning the board with it. You can also reduce noise with any type of inductor by connecting it so that the outer windings of the inductor are connected to VCC rather than the switch node.

    Regards,

    Clint