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TAS5760 PVDD Capacitor

Masaoki Koide
Intellectual 580 points

Other Parts Discussed in Thread: TAS5760XXEVM

Dear Sir,

Our customer would like to use smaller PVDD Capacitor.

Are there any requirements about impedance and acceptable ripple of PVDD? 

If the impedance is lower, can they use smaller capacitor?

Regards,

Koide

  • 0
    TI__Guru 57800 points

    Hi, Koide,

    The bulk capacitor selection in PVDD depends on the quality of the power supply used in the End-system. For noisy power supplies, large bulk capacitor is required. If the power supply in the system is stable, you might use smaller capacitor. Maybe 2×22µF SMT caps per side as in the TAS5754MEVM could be used. The High frequency decoupling capacitor should be kept to avoid problems related to the ringing in the outputs of the amplifier. 

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 580 points
    Hi Diego,

    Thanks for the advice. As you mentioned, there are 2 x 22uF capacitors on TAS5754MEVM. In case of TAS5760xxEVM, there is a 470uF cap. Where does the difference come from? Power supply stability? Could you please let me know ripple voltage assumption for each EVM?

    Regards,
    Koide