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TPS92520-Q1: COMP pin decoupling.

Pawel Piwowarski87949
Intellectual 795 points
Part Number: TPS92520-Q1
Other Parts Discussed in Thread: TPS92519-Q1

Hi.

In TPS92520-Q1 datasheet we have:

COMP pins are connected to signal ground.

But in EVAL modules (TPS92520-Q1 LaunchPad-Controlled, ECUEvaluation Module, and also in TPS92519-Q1 Evaluation Module) I see that COMP capacitors are connected directly to nearest ground plane, which is much more closer to power PGND pins.

My question is, how much important is to proper decouple COMP pins to signal ground?

If necessary, I can route independent GND tracks directly from GND pins (7 and 10) to COMP capacitors.

Thanks in advance!

  • 0
    TI__Mastermind 18535 points

    The circulating high di/dt currents should stan in the part and on the top layer.  The star ground is right under the part.  The connections for the COMP are immediate to the star which is good.  If you want to route it to the AGND which is pin 10 GND then you can, but you will increase the trace length and it might be exposed to more noise this way.  The current solution works well as it is, but if you want to experiment fine but that is your engineering judgement.