• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 30 subscribers
  • Views 197 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS2505-Q1: TAS2505-Q1 related query

Rekha Menon
Prodigy 80 points
Part Number: TAS2505-Q1

Hi Team,

We are using TAS2505TRGE-Q1 audio codec in our design.

As per my understanding, the SPL of the speaker and the gain of the class D amplifier are directly related. Presently we are supplying SPKVDD = 5 V and using a 2W rated speaker. However, since the gain is limited to 18 dB, the Output power of the codec is limited to 1.7/1.3 Watts approx.. Wanted to know the Max output power when the gain is increased to 24 dB as per section 7.3.6 of the datasheet for both THD=1% and THD=10%.

Also, If the Max Output power for a gain of 24 dB exceeds 2 Watt, kindly provide your thoughts regarding protection circuitry to be used for the same.

  • +1
    TI__Guru* 99505 points

    Hi Rekha,

    What is the load impedance for this application? I'm assuming it is 8-ohm?
    The output power vs THDN would follow the trend from data sheet figures 6-9 and 6-11, but just a bit limited from 5.5V down to 5V supply: https://www.ti.com/lit/ds/symlink/tas2505-q1.pdf#page=12&zoom=100,0,300

    For a higher gain the only difference is that you reach higher power and THDN earlier for lower input signal levels. Highest output power limit can be fine-tuned by increasing the Class-D gain using page 1 register 48 and then reducing the gain in smaller steps (0.5dB) using page 1 register 46.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0
    Prodigy 80 points

    Hi Ivan,

    Thanks for the reply.

    Yes, the load impedance is 8-ohm. There is no much impact post the methods suggested by you as well as the datasheet.

    I would like to know if there is any protection circuitry that can be used on board to avoid clipped signals damage the speaker.

    Thanks & Regards,

    Rekha