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TAS5713 PBTL Settings and Load Question

Zachary Lyzen
Prodigy 140 points
Other Parts Discussed in Thread: TAS5713, TPA3118D2

Hello,

I am currently developing a stereo application that utilizes 4 TAS5713 Chips. (2 separate  boards so I2C isn't a problem)

The application consists of 4 drivers (2 mid-woofers and 2 tweeters) being driven by their own TAS5713 chips configured to PBTL mode.

I apply my EQ  (depending on the chip (high pass low pass etc)) and the left and right depending on the chip as well.

Everything is working however, I have some questions:

My woofer is 8 Ohms, will this be a problem for my output filter or just from the fact that this is doubled due to PBTL?

My tweeter is 6 Ohms, should I be changing the filter or can they use the same values?

Is there a modulation scheme that is better or worse in this situation?

I have built circuits with the TPA3118D2 in the past and seem to like the performance of this better.  I figured with active crossovers and digital (lossless) inputs  I would achieve better results.  The big differences I can think of with the new design are: AD modulation instead of BD modulation.  Small inductors (3.5A vs 6A).  Now the circuit is PBTL not just BTL so my impedance doubled..

I am thinking it is the current-handling of the inductors-they might be saturating. (I am connecting outputs pre-filter for the TAS5713 in PBTL) but as I dive into the filter design for this I am not seeing many examples with loads greater than 8 Ohms

Any advice would be appreciated thanks!

-Zack

  • 0
    TI__Guru 57800 points

    Hi Zack,

    Generally you can use a bigger load in PBTL, but the power will be lower than the specified.

    Output filter should be ideally calculated for each load used, you can use the same filter for 8 and 6 ohms, as long as the cutoff frequency on both is out of the audible band.

    BD mode offers generally a better performance than AD mode.

    Have you taken a look to our Class-D LC Filter Design App Report?, i think it will be useful for you.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer