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TAS6424E-Q1: Minimum PVDD capacitance

Shinji Tsuji
Genius 14309 points
Part Number: TAS6424E-Q1


Hi team,

PVDD capacitance is 220uF in recommended application circuit for 45W 2ohm.

In my use case output is only 10W/2ohm 2channel. 

In that case, is how much I can reduce the PVDD capacitance?

I would like to use as high as 44uF. 

Could you also advise which parameter or condition should I evaluate to find the minimum PVDD capacitance?

regards,

  • 0
    TI__Expert 5810 points

    Hi Shinji.

    You can choose the caps value of PVDD through below aspects:

    1.  If you use a boost or buck converter to power PVDD, you should promise the ripple of switching frequency and ESR(Caps) within your sepc's range, like total ripple should smaller than 1%PVDD to avoid output clipping.

    2. Some customers have some requirements about the time of shutdown drop.

    On the basis of the above calculation, it is better to reserve a margin of 1.2-1.5 for caps's derating under high temp or high volatge.

    BR.

    Wei Qiu.