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TAS2559: Estimated speaker temperature too high

Mooncheol Kee
Prodigy 170 points
Part Number: TAS2559
Other Parts Discussed in Thread: TAS5766M

Hi.

I am trying TAS2559 EVM with a Full-Range Speaker.

(4-ohm, 5W, 42-mm diameter)

I measured speaker parameters using Learning Board (NOT Learning Board 2).

In TAS2559 APP, I inputted speaker parameter values manually.

(TAS2559 APP cannot open/import Learning Board ppc3 file.)

While tuning and audio processing,

Estimated temperature(Tv) shows over 300 degrees in verification window.

It is weird that coil temperature rises so high rapidly.

I think speaker parameters measured from Learning Board can be used in TAS2559.

Is it possible to use speaker parameters measured from Learning Board (NOT Learning Board 2)?

Or are there abnormal parameters in table below?

Speaker Parameters from Learning Board

Driver 　 　
Re Ohm 3.42
Sd cm2 8.55
Driver Model - Thiel Small 　 　
Fs Hz 168
Qts 　 0.468
Qms 　 3.89
Vas liter 0.0398
Qes 　 0.532
Driver Model - Physical (Lumped) 　 　
Bl Tm 3.97
Cms mm/N 0.387
Mms g 2.32
Rms Ns/m 0.629
Inductance Model 　 　
Le mH 0.288
L2 mH 0.112
Ke 　 0.336
Temperature 　 　
Rtv K/W 12.3
Ctv J/K 1.25
Rtm K/W 6.61
Ctm J/K 33
Rtva K/W 2510
Temperature Coefficient 1/K 0.0033

Best regards,
Kee

  • 0
    TI__Mastermind 20085 points
    Hi Mooncheol,

    As you mentioned TAS2559 doesn't allow you to import the LB1 results to the app directly, so entering them manually should work well. But we usually recommend using LB2 in order to avoid any error while transferring the data.
    On the other hand, You could provide us your TAS2559 ppc3 file to review it.
    I have a question for you, What kind of speaker are you using?

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Prodigy 170 points

    Hi José Luis.

    Thank you for your support.

    I tried (speaker unit only) and (unit + passive radiator) type,

    but both show the same high temperature.

    Speaker parameters above is for speaker unit only (closed box).

    Attatched TAS2559 ppc3 file is for speaker unit only.

    tas2559_unitOnly.zip

    Best regard,

    Kee

  • 0 in reply to Mooncheol Kee
    TI__Mastermind 20085 points
    Hi Mooncheol,

    As I mentioned in another thread the passive radiator isn't supported for TAS2559 yet.
    Were the data taken on the speaker or the passive radiator? besides, we noticed that Fs is very low, Is the speaker in a closed box?
    We are going to review the file and will come back to you soon with further information.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer
  • 0 in reply to José Luis
    Prodigy 170 points

    Hi José Luis.

    That data were taken on the unit(driver) only without enclosure.

    For more information, I attach the Learning Board ppc3 files.
    lb_unitOnly.ppc3: Unit(driver) only
    lb_port.ppc3: Ported box

    Best regards,
    Kee

    lb_unitOnly_port.zip

  • 0 in reply to Mooncheol Kee
    TI__Mastermind 20085 points

    Hi Mooncheol,

    TAS2559 just supports speakers in a closed box, you should take the measurements under this condition. Besides, you must take into account that your application can't work in the TAS2559. On the other hand, I need more information about customer name, business opportunity etc.

    Please let me know your thoughts.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer

  • 0 in reply to José Luis
    Prodigy 170 points

    Hi José Luis.

    I measured driver only parameters and ported box parameters using Learning Board, respectively.
    And both cases show the same high temperature.

    I came to know late that TAS2559 does not support ported box or passive radiator type yet.

    Low frequency response is different between a closed box and port/passive radiator type,
    so I am afraid TAS2559 is not suitable to our application.

    Are there other SmartAmp products supporting port or passive radiator types?
    TAS5766M seems too high power for 5W BT speaker.

    Best regards,
    Kee

  • 0 in reply to Mooncheol Kee
    Prodigy 170 points
    Hi José Luis.

    TAS5766M seems more powerful, but the price is higher.
    So TAS2559 is still under consideration.

    If TAS2559 is to be used, low frequency response would be adjusted using EQ filters.
    But high temperature problem still remains.
    TAS2559 seems to decrease gain for thermal protection.

    Whether it is a driver only or a ported box,
    in my opinion, it is abnormal that coil temperature displayed rises so high.

    Is there a chance to handle this problem?

    Just for your information:
    In the thermal characterization process using Learning Board,
    20kHz tones did not heat up the speaker(driver).
    So the excitation frequency had to be lowered 500Hz.

    Best regards,
    Kee
  • 0 in reply to Mooncheol Kee
    TI__Mastermind 20085 points
    Hello Moonchel,

    As I mentioned, you should take the measurement with the right condition in order to get the right data, I mention you because you wrote that the measurements were taken on the unit without an enclosure.
    You are right regarding TAS5766M can work with a passive radiator or a ported box. I'd recommend you to use this device in order to avoid problems with your application.

    Best Regards
    José Luis Figueroa
    Audio Applications Engineer