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TAS2557EVM: How to increase speaker output power? (PPC3 ; PP-SALB2)

TW Hsueh
Prodigy 90 points
Part Number: TAS2557EVM
Other Parts Discussed in Thread: TAS2557

Hi 

1. According to Taiwan FAE recommendations  (Speaker: Ø28x7.5mm; 3W; 4ohm)

a. Set the delta temperature from 65deg => 85 and 105 deg
b. Close the feed forward
c. The frequency response does increase
As follows

Although different temperature settings can change the output wattage.
However, the actual measured voltage on the speaker is 1.78 Vrms, which is about 0.79W.
It is very small.

2. New speaker Characterzation issue. (Speaker: Ø42x18.8mm; 3W; 8ohm)

Thermal test shows unable to heat the speaker (set to delta thermal 85deg).
Ask me to adjust "Controller settling correction".
I have changed to max 40% and min. 1%, the results are the same.
What other parameters need to be modified to be able to run it?

thanks,

TW

  • 0
    Prodigy 90 points

    1. FR pictures

    2. Thermal pictures

  • 0
    TI__Intellectual 865 points

    Hello TW Hsueh,

    Welcome to E2E and thank you for your interest in TAS2557.

    May I ask what is the Tmax of the speaker on the datasheet?

    Couple of the steps I would recommend for the thermal test are:

    1. Adjust the controller gain 0.03. This will increase the power output to heat up the speaker.
    2. Try a lower delta but tolerable delta Celsius. Because every speaker respond differently, it is best to test the delta Celsius for the speaker for several runs(below/above or near Tmax). If Tmax is 90 C and ambientt is 20 C, try delta C of 60-65 C.
    3. Give enough time for the coil to cool between each run

    Let me know if these steps resolve your issue or if you have any questions

    Regards,

    Jin Gao

  • 0 in reply to Jin Gao
    TI__Intellectual 865 points

    Hello TW Hsueh,

    I hope you were able to resolve your issue. Due to thread inactivity, I will have to close this thread soon. However, please feel free at anytime to post your questions or comments in case of additional observations.

    Thank you for using E2E,

    Jin Gao