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Original question:

TPA2016D2: Question about the Gain Limiter Level

TPA2016D2: how to set TPA2016D2 DRC

xu lm
Prodigy 10 points
Part Number: TPA2016D2

Tool/software:

how to set TPA2016D2 DRC

The specification states that with a 5V power supply, the power corresponding to 1% distortion is 2.5W. However, even when the limiter power level is maximized, the output can only reach 2W. Is it possible to set a higher value

  • 0
    TI__Guru** 109395 points

    Hi Xu,

    Have you tested by setting compression to 1:1 and disabling the limiter?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 10 points

    This is how it's set up now,  he current setup has increased the power output, but the distortion is significant. We need to use DRC (Dynamic Range Compression) to limit it. 

  • 0 in reply to xu lm
    TI__Guru** 109395 points

    OK, so if you disable limiter, you're able to get more than 2W but the distortion is higher, correct?
    If that's the case, are you using the QFN version of the device? Is your load 4Ohm as suggested in data sheet plot?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 10 points

    yes, distortion is higher

    now we use QFN:TPA2016D2RTJR    SPK load is 4Ohm

  • 0 in reply to xu lm
    TI__Guru** 109395 points

    Hi Xu,

    That should be the correct way to do this.

    Can you share captures of the output waveforms? Please use a low-pass filter such that the signal is no longer a Class-D PWM signal but the analog version of it. Please test with sinewaves so that the distortion is better visible.

    Please also share your schematic, make sure you have proper decoupling capacitors close to the amplifier VDD pins.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 10 points

    we want to know how to set DRC，TKS

  • 0 in reply to xu lm
    TI__Guru** 109395 points

    Hi Xu,

    You should disable DRC if need to get the highest power output, if the compression is set to something other than 1:1 the limiter will be enabled.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 10 points

    In SPEC metioned  "Programmable DRC and AGC Parameters" ,  but I don't know how to program DRC, can you tell me?

    May be TPA2016D2 doesn't support programming DRC?

  • 0 in reply to xu lm
    TI__Guru** 109395 points

    Hi Xu,

    This device documentation mentions AGC and DRC, the DRC portion of the features could be considered as the "Compression ratio" in register 7.
    AGC and DRC are names sometimes used interchangeably, in general the settings you're looking for are the ones with "AGC" in its name.
    Section 9.6 in the data sheet has some information on how these registers should be set.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 10 points
    We encountered a problem when testing the THD+N of TPA2016. Test conditon is VCC=5V ,RL=4 Ω ,P0 = 0.2W When a 30K low-pass filter was not used and the output of TPA2016 was directly connected to the AP, the test result showed that the THD+N of the input 1KHZ-12db signal was 1.3%。When a 30K RC low-pass filter (R=1K, C=4.7nf) is added between TPA2016 and AP , the test result shows that the input 1KHZ-12db signal THD+N is 0.12%, and the test results different greatly. there are three question about this ：
    1、What is the reason for this ?
    2、Is it necessary to add a 30K RC low-pass filter when testing THD+N? Our AP is already has an internal 20k low-pass filter 。
    3、Is it necessary to add a 30K RC low-pass filter and then connect the speaker in the schematic design?
  • 0 in reply to xu lm
    TI__Guru** 109395 points

    Hi Xu,

    1. The Class-D switching may still be coupling into the measurement.
    2. Yes, a low-pass filter is required for Class-D amplifier performance measurements. Usually AUX-0025 or similar is used for this. AUX-0025 / 0040 / 0100 Switching Amplifier Measurement Filters | Audio Precision | The Global Leader
    3. No, the filter is only required for measurements, and it should be connected in parallel with the load/speaker. For end application the filter is not required, and the speaker is connected directly to the amplifier output.

    Best regards,
    -Ivan Salazar
    Applications Engineer