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TLV320AIC3100: Speaker output monitoring and definition of overcurrent condition

Hideki Hayashi1
Expert 6930 points
Part Number: TLV320AIC3100
Other Parts Discussed in Thread: TMUX1309, TMUX4827, TS3A5223, TMUX2889, TS5A23157, TS3A24157

Tool/software:

Hi team,

1. Customer wants to motniro output power by routing speaker output (either P or M) to NJW1124. Is it ok for usage? The speaker load is 8ohm and input resistance of NJW1124 is 5.1kohm, so I think no issue there.

2. From the datasheet, 7.3.10.13.2, what is the overcurrent situation in TLV320AIC3100 and how much the threshold?

Best regards,

Hayashi

  • 0
    TI__Mastermind 29935 points

    Hi Hayashi-san,

    1) I also think this is okay. I would expect a small power loss since some current will go away from the speaker, but overall it should be fine.

    2) The exact current allowed depends on the SPKVDD. The maximum power ratings on Page 10 of the datasheet give three scenarios of various SPKVDD voltages. You can derive the peak current from this (Power / SPKVDD = Peak Current). Depending on what SPKVDD you are using you can estimate the over current limit.

    Best regards,
    Jeff McPherson

  • 0
    Prodigy 140 points

    Hi McPherson-san,

     

    I appreciate the kind and polite reply.

     

    I received an additional request from a customer.

    So, I have a follow-up question for you regarding analog switches.

     

    Question 1

    Is TMUX1309 being used correctly?

     

    Question 2

    Our usage results in some unused pins on TMUX1309.

    Can you recommend a better analog switch?

     

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Mastermind 29935 points

    Hi Suzuki-san,

    From an audio point of view you are using it correctly. Be aware you might get pops when switching the terminating load if you do not shut down the speaker driver before switching the load.

    I will pass this ticket to the multiplexer team to see if they have any recommendations as I am not familiar with our mux options.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    TI__Expert 6405 points

    Hello Shinya,

    Please correct me if I am wrong but it seems your application with the mux includes two inputs and 4 outputs. If that is the case then you are looking for a 2:1 2-channel audio mux. 

    My recommendation is the TMUX4827. It is a 2:1 2-channel mux designed for audio applications.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Hi Gilgur-san,

     

    I appreciate the kind and polite reply.

     

    I have confirmed that TMUX4827 meets my desired specifications.

    As you commented, I am looking for a 2:1 2-channel audio mux.

     

    However, I have doubts about your suggestion.

    I checked unit price of each part number on TI.com.

    Unit price of your recommended TMUX4827 is USD1.19/pcs.

    On the other hand, unit price of similarly specified TS3A5223 is USD0.15/pcs, TMUX2889 is USD0.615/pcs.

     

    Question 3

    I would like to know why you don't recommend TS3A5223 or TMUX2889.

    (Additional Note)

    The cost of product I am developing is very strict.

    Therefore, I would like to use device with the lowest unit price that meets my required specifications (2:1 2-channel audio mux).

     

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Expert 6405 points

    Hello Shinya-san,

    If price is a critical concern with your application, I will loop in our marketing team via email to help to find a solution that fits your budget.

    I have recommended the TMUX4827 since it fits the configuration you require and it is designed for audio application such as yours. 

    I was not aware of the voltage range you are using. The TS3A5223 or TMUX2889 can also fit your application, I was more inclined on the TMUX4827 since it is used mainly for audio input or output switching (as shown in the figure below from the datasheet.  

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Hi Gilgur-san,

     

    I appreciate the kind and polite reply.

    I will withdraw question 3 and re-draft question 4.

     

    Premise (Applications)

    We are looking for an analog switch that can switch speaker amplifier output of TLV320AIC3100 between "speaker (8Ω)" and "HAC-coil".

    Question 4

    Please introduce us to an "analog switch" that meets our needs and has lowest cost.

    By the way, I understand that maximum output of speaker amplifier can be adjusted using DRC built into TLV320AIC3100.

    (I plan to end my questions in this thread with answer to question 4.)

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Expert 6405 points

    Hello Shinya,

    Understood, thanks for your feedback. I can recommend the TS5A23157. It is our lowest cost 2:1 2-channel device. 

    It is designed for audio signal routing. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Hi Gilgur-san,

     

    Thank you reply.

     

    I have two questions about TS5A23157.

    #1

    Ron (ON-state resistance) is 18Ω.

    How did you determine this?

    #2

    TS5A23157 does not list Ptot (Total power dissipation).

    How did you determine this?

     

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Expert 6405 points

    Hello Shinya-san,

    The Ron was determined to be 18Ω through testing and validation. In the datasheet the test conditions are shown to be:

    And the test setup is below:

    The max power dissipation is not shown in the datasheet, but I can provide the value for you. 

    For the TS5A23157, Pd (ma) = 900mW.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Hi Gilgur-san,

     

    Thank you reply.

     

    Pd (ma)

    900mW meets our requirements.

     

    Ron

    We plan to use an 8Ω speaker.

    So, Ron of TS5A23157 is 18Ω which I don't think should be acceptable.

     

    I would like to ask you again.

    Please introduce me to lowest device that meets following specifications:

    1. "2:1 2-channel device" used to switch speaker output
    2. Pd > 0.75W
    3. Ron < 1Ω

     

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Expert 6405 points

    Hello Shinya,

    If you are looking for a low Ron device, then the power dissipation will also be low.

    Is Pd a critical parameter in your application? why do you need Pd > 0.75W?

    If the Pd parameter is not critical. I can recommend the TS3A5223. It is a 2:1 2-channel device with Ron = 0.45Ω, Pd = 153 mW. It is also our lowest cost device for your requirements. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 140 points

    Hi Gilgur-san,

     

    Thank you reply.

     

    > Is Pd a critical parameter in your application? why do you need Pd > 0.75W?

    Because speaker can be driven up to 1W.

    I think it is necessary to achieve both Ro and Pd.

    And after looking at datasheet, I determined that a Pd of 0.75W is a realistic specification.

     

    Question 4

    I understand that answer to question 4 is TS3A5223.

    CLOSE.

     

    Question 5

    Pd of TS3A24157 is not listed in data sheet.

    Please tell me Pd of TS3A24157.

     

     

    Best regards,

    Shinya Suzuki

  • 0 in reply to Shinya Suzuki
    TI__Expert 6405 points

    Hello Shinya,

    The Pd of the TS3A24157 is 180mW.

    You mentioned the impedance of the speaker is 8Ω, will a mux close to that impedance (Ron < 8) will suffice? It will help to accomplish your Pd requirement.

    Also can you please elaborate on the price you are looking for? I mentioned the TMUX4827 earlier, but you said it was too pricey. Can you please elaborate on your price goal? 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    TI__Expert 6405 points

    Hello Shinya,

    Sorry I didn't mean to close the thread. 

    Thanks,

    Nir