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TPA2011D1: does TPA2011 supports 10x gain design?

Part Number: TPA2011D1
Other Parts Discussed in Thread: TLV320AIC3021

TPA2011 connected behind TLV320AIC3021. customer would like to drive 2x 1W mono speaker by TPA2011

Questions:

1) TLV320AIC3021 lineout support 0.5Vrms to IN+/- of TPA2011. Does this implementation good to drive 2x 1W mono speaker by TPA2011?

2) Based on the design, it need supporting 10x gain for TPA2011. Does the gain design good for TPA2011? or what is the gain(resistor ratio we suggest?)

TLV320AIC3021 datasheet

TLV320AIC3021IYZFR.7z

  • Hi, Peter,

    Please take a look at my responses below and let me know if you have additional questions or comments.

    1) TLV320AIC3021 lineout support 0.5Vrms to IN+/- of TPA2011. Does this implementation good to drive 2x 1W mono speaker by TPA2011?

    The implementation seems to be all in order. I just recommend to ensure that the equivalent speakers impedance will be at least 4ohms.

     2) Based on the design, it need supporting 10x gain for TPA2011. Does the gain design good for TPA2011? or what is the gain(resistor ratio we suggest?)

    The 33kohm resistor provides an approached gain (9.09dB typically). In strict terms, customer would require a 30kohms resistor in order to provide a 10dB gain as shown in the electrical characteristics section of datasheet (see below picture for details). 

    Best regards,
    Luis Fernando Rodríguez S.

  • Hello Luis Fernando,

    I would like to confirm you again that TLV320AIC3021 lineout support 0.5Vrms to IN+/- of TPA2011. Does this implementation good to drive 2x 1W 6ohm mono speaker by TPA2011?

    according to attaching in Gain for  answer 2, 33Kohm resistor  provide 9.09V/V(it should not 9.09dB, right?), Does it mean that customer can goes 30Kohm for 10x (V/V)gain in their application?

    can you review the questions again? thanks

  • Hello, Peter,

    The TPA2011 supports a speaker load of 3.2ohms as minimum value. Connecting 2x 6ohm mono speakers will result in an equivalent impedance of 3ohm (it is below the minimum value!). So, this implementation won't be good to drive these loads. He would require speaker loads around 8ohms to get good results.

    Regarding your question about your gain, customer would need a 30kohm resistor in order to get a 10x gain in their application. His actual values results in a 9.09 V/V gain.

    Best regards,
    Luis Fernando Rodríguez S.
  • Hello Luis Fernando,
    besides the 2x 6ohm mono speakers won't be good to drive these loads because 2x 6ohm speaker result in an equivalent impedance of 3ohm.
    one more question from customer. Does it make any THD or any performance drop when they would need a 30kohm resistor in order to get a 10x gain( actual values results in a 9.09 V/V gain) in their application.
  • Hello, Peter,

    The THD and THD+N parameters don't depend of the device gain. These parameters only depend of the VDD power supply level, the output frequency and the output power. You may take a look at the Typical Characteristics section ( www.ti.com/.../tpa2011d1.pdf ) for details about how the THD and THD+N values vary according to the mentioned parameters.

    Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.
  • Dear Luis:

    Nice to see you, this is Foxconn Michael.Ren.

    I have a more questions about the output current. How to calculate the output current, when output power is 2W with RL=4ohm and Vdd=3.6V.

    Do you think the output bead FFB20 and FFB21 is enough?

    Michael.Ren
  • what is the THD+N  if  customer goes TLV320AIC3021 output power to 2W with 4ohm load

  • Hi, Michael,

    In order to calculate the output current, you just need to calculate according to the expression:

    Where, "I" is Current, "P" is the output power and "RL" is the speaker load impedance.

    It is similar to calculate the current in a resistor. 

    The output bead seems to be enough for this device. However, if you are looking more details about external Class-D filters, you may take a look at this app note:

    http://www.ti.com/lit/an/slaa701a/slaa701a.pdf

    It may serve as a guide to design an EMI filter.

    Best regards,
    Luis Fernando Rodríguez S.

  • Peter,

    Unfortunately, we only support the low-power amplifiers. Could you create a new post for any questions related to the TLV320AIC3021? A member of the respective team will reply as soon as possible.

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.