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TPA2100P1 Inductors and Capacitors changes.

Stefan Urach
Prodigy 10 points
Other Parts Discussed in Thread: TPA2100P1

    Hello

1) I want to design a PCB which includes the TPA2100P1 Amplifier.
    We have to design it really small.
    So we are going to make all external components really small.
    The Datasheet describes (Page 13) that the minimum working inductance should be
    3.3 uH. I would like to know what happen, if the inductor size will be 1 uH ?
    How does the curcuit react, and what happens to the other devices?

2) My second Question: There are two 10 uF Capacitors in the Datasheet schematic.
    Do we need them? Or can we swap this two 10 uF Capacitors by two 1 uF Capacitors?

    Best regards

    Stefan

  • 0
    TI__Mastermind 20085 points
    Hello Stefan

    Welcome on E2E, thank you for your interest in our products.
    1) That may cause instability or the device may reach its current limit at a lower output voltage than expected. It is always recommended to follow given guidelines in the datasheet for a correct operation.
    2) In order to avoid instability the value of the boost capacitor must be higher than 10uF.
    The decoupling capacitor of 10uF filters out high-frequency noise and it acts as a charge reservoir, providing energy more quickly than the board supply, thus helping to prevent any droop. The decoupling capacitor of 1uF helps with higher frequency transients, spikes or digital hash on the line.
    In fact, we always recommend to add both capacitors to get better performance.

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer | A-Team