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TPA6204A1: A depop circuit for TPA6204A1

Paul Lai
Prodigy 130 points
Part Number: TPA6204A1

Tool/software:

Dear sirs,

        I have noticed a popping noise in the circuit (as follows; NC means not connect) and I suspect it is caused by the circuit switching.

       Therefore, I think that a depop circuit is needed. Could you share the depop circuit with us? Thanks.

  

  • 0
    Prodigy 130 points

    In addition, SPK-2 and SPK-3 are pin-type contact to a tweeter (due to space issue).

  • 0 in reply to Paul Lai
    TI__Genius 10305 points

    Hey Paul, 

    Pop noise issues usually occur when the HW configurations on either the input or output terminals have AC components (caps & inductors) that allow for a lot of unwanted transient current to pass. Keeping the tolerance of each component to a minimum would be ideal. For example, 10% tolerance on a cap would be considered too big. 

    Also, the output terminals on the EVM don't have an inductor, maybe those components are also storing too much current.

    I strongly suggest following the schematic provided by the EVM User's Guide

    Regards,

    Ore.

    disclaimer: TI isn't responsible for customer design.

  • 0 in reply to Ore Ogundana
    Prodigy 130 points

    Dear Ore,

             Thanks.

    Best Regards,

    Paul Lai

  • 0 in reply to Paul Lai
    TI__Genius 10305 points

    Hey Paul, 

    Another thing I'll like to add is if you do intend to add inductors on the output terminals, create an LC filter out of the inductor. Use a bypass cap in the nF or uF and inductor in the uH. LC filters are good for audio performance but the wrong values could lead to overcurrent situations that you want to avoid. 

    In your circuit, start with inductor values from 3uH and cap values of maybe 1uF or less. 

    Regards,

    Ore.

    Disclaimer: customer is responsible for their design. TI isn't responsible for customer design.