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TPA3113D2 Schematic Design Question

Steve Kersten
Prodigy 20 points


On the TI eval board, there are 330pF and 10ohm snubber filters on all four of the output boot strap outputs.  The latest application note does not have these filters.

What issue do these snubbers address?  Is it a good idea to include these filters, or can they be safely eliminated?

My current design is for a stereo in / stereo out amplifier.  My design is for 8ohm speakers and I am using 33uH / 1uF output filters instead of the ferrite bead option.  I am powering my design with 24V.

  • 0
    TI__Mastermind 37045 points

    Hi Steve,

    Those RC snubbers are used to minimize the ringing on the PWM outputs which helps with EMC and THD.  They are not necessary for reliable operation with good PCB layout. The values are dependent on the PCB layout (parasitic inductances). If your PCB space is not an issue, I would suggest keep the pads but DNP. Stuff them if necessary during evaluation.

    reg,

    Paul Chen

    Audio Applications Engineer

  • 0 in reply to user5276421
    Prodigy 20 points

    Thanks, Paul.

    Space on my PCB is not an issue, but space around the device is.  I am using 50x80 parts so cramming them in near the output pins is problematic.  I have decided to drop a via as close to the output pin as possible and mount these parts on the backside.  My part footprint has 21 0.016" vias connecting the pad with the bottom ground plane,  so the grounds of the snubbers will be electrically close to the part ground.