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TPA2017D2RTJEVM: Quiescent supply current is greater than the typical characteristic on the datasheet

Kazuto Tatsumi
Intellectual 2820 points
Part Number: TPA2017D2RTJEVM
Other Parts Discussed in Thread: TPA2017D2Hi Team,

My customer has found the quiescent supply current (I_DD) is greater than the typical characteristic on the datasheet when they test TPA2017D2RTJR on the EVM.

According to the Figure 1 on the dataseet, the quiescent supply current (I_DD) is approximately 4 mA, but my customer measured ~10 mA.

Could you please give me some advice to achieve I_DD~4mA? Do you have any idea what parts consume the power in the no sound condition?
The test condition is shown in below.

V_DD = 5V
EN = H
Sound input = No (Quiet)
Output = Open / 8-ohm speaker (both lead the same result)

Best Regards,
Kazuto Tatsumi
  • 0
    TI__Guru* 84915 points

    Tatsumi-san,

    Thank you for the details that you provided.

    Do you know if VDD is only connected to the power pins (AVDD, PVDDL, PVDDR)? There are some pins that are connected to VDD and may be increasing the current consumption.

    EN pin is pulled up to VDD.
    AGC1 and AGC2 may be connected to VDD too.
    Is J3 being used?

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    This is Tatsumi-san's customer.

    On the evaluation board, NEITHER J1, J2 NOR J3 is used.

    EN is pulled up to VDD lilke you have mentioned. However, it is pulled up with 100kohm (if the schematic diagram of evaluation board is correct), therefore the current via EN pin must be 0.05mA maximum.

    Both AGC1 and AGC2 are connected to VDD. But, according to the TPA2017D2RTJEVM data sheet, high-level input current via AGC1(2) is 1uA maximum.

    Actually I tried to float both AGC1 and AGC2 with removing 2 jumpers, but the supply current kept 10mA.

    Best regards,

    Atsushi HANZAWA (SHARP corporation)  

  • 0 in reply to Luis Fernando Rodriguez S.
    TI__Intellectual 2820 points
    Hi Luis, Thanks for your support. My customer Hanzawa-san has already replied, could you check it? Regards, Kazuto
  • 0 in reply to Kazuto Tatsumi
    TI__Guru* 84915 points

    Hanzawa-san & Tatsumi-san,

    I apologize for my late reply.

    Since we don't have the TPA2017D2EVM at this moment, we are limited with the test. However, I'm wondering if any of the additional filters in the EVM could be causing this current increment.

    Is it possible to remove the resistors R6, R7, R8 & R9 from the EVM? This is just to verify if the outputs filters could be associated to this current increment.

    Thank you.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    I cannot remove resistors you have mentioned, because they haven't been mounted on the EVM.

    By the way, according to the 4th page of TPA2017D2 data sheet, IDD will be 5.5mA maximum.

    On the other hand, on the 6th page of the same document, IDD will be less than 4mA.

    Which is correct?

    Best regards,

    Atsushi HANZAWA

  • 0 in reply to user3555915
    TI__Guru* 84915 points

    Hanzawa-san,

    I would suggest to follow the information of 4th page of the datasheet. These values are more specific and this section describes which are the parameters are used to calculate these current values.

    Even if the EVM seems to take more current during its usage, it has more components connected to the TPA2017D2 that could be demanding more current than the one specified in the datasheet. So, the correct current values are the specified in page 4 of datasheet.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    Thank you very much for your suggestion. I understand that I should follow the 4th page of datasheet.

    Still, like you have already realized, IDD of my EVM measurement result (10mA @ VDD 5V) is much higher than the datasheet information (less than 5.5mA).

    I wish you to measure IDD on EVM because I want to resolve this issue asap.

    Can you say for certain when you get an EVM?

    Is it better to return the EVM which I have now to you?

    (P.S.)

    I tried to remove C16, C17, C18 and C19 from the EVM, and I got less than 4mA IDD whether loudspeakers are connected to the EVM or not.

    I played music with the EVM at the condition, and the sound had no defect.

    Therefore I want not to mount these capacitors on our actual products.

    To do so, what should I be aware of?

    Best regards,

    Atsushi HANZAWA

  • 0 in reply to user3555915
    TI__Guru* 84915 points

    Hanzawa-san,

    Even if the EVM uses these output inductors and capacitors, they are not required for a proper device behavior. The TPA2017D2 is a filter-free Class-D Audio Amplifier. This device doesn't require of output filter like the LC array that you removed from the EVM.

    Usually, this kind of LC filters are only recommended for output power above 10W ( http://www.ti.com/lit/an/slaa701a/slaa701a.pdf ). In this case, it is not required and you have nothing to worry about these additional components in your actual products.

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

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 230 points

    Thank you very much for your advice.

    I guess that the purpose of such LC-filter circuit is to resolve EMI issue. Of course we'll check EMI level of our actual product by ourselves, and I think there will be no problem with it.

    I recognize that the quiescent supply current issue is resolved and currently I have no additional question.

    Thank you very much and best regards,

    Atsushi HANZAWA