TAS6424R-Q1: check PVDD capacitor value affect THD issue

wu yujiao

Prodigy 130 points

Part Number: TAS6424R-Q1

I would like to check whether PVDD buck capacitor value will affect output THD parameter.

how to calculate the relation between PVDD capacitor value and THD value?

over 2 years ago

+1 Gregg Scott over 2 years ago

TI__Mastermind 45035 points

Yujiao,

The PVDD bulk capacitor or the large electrolytic capacitor can affect the clipping behavior of the amplifier at low frequencies. Too small of a value and the audio ripple imposed on PVDD will cause early clipping and a higher THD. Below the clipping point the THD is not impacted by the bulk capacitance.

Regards,
Gregg Scott

0 wu yujiao over 2 years ago in reply to Gregg Scott

Prodigy 130 points

Hi Gregg

thanks for your reply.

now we use two TAS6424R-Q1 IC as BTL 4*40W 2ohm and 4*20W 4ohm application in one audio system, and customer required 4*40W THD 1% and 4*20W THD 1%. if we use one 560uF capacitor in PVDD at one TAS6424R-Q1, would it fulfill requirement for THD 1%?