This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPA2013D1EVM - J6 and S1(BOOST ON/OFF)

Other Parts Discussed in Thread: TPA2013D1EVM, TPA2013D1

Hi all

Would you mind if we ask TPA2013D1EVM?

<Question1>
J6 on TPA2013D1EVM, what is this J6 used for?
-Is it used for Reduction of noise,  Snubber using RC circuit?
-Is it Analog Monitor using LPF?

<Question2>
We'd like to get the IN-THD characteristic, in case of Boost ON and in case of Boost OFF.
So, could you let know us this method?

Furthermore,
S1 on TPA2013D1EVM, is it possible to try turning  BOOST on or off,
but Output was stopped because 17 pin and 16pin were connected with.
So, when the Boost is off, is the output stop?.
Is it required SDd high(J4  2-3)?

Kind regards,

Hirotaka Matsumoto

  • Matsumoto-san,

    Thanks for your question. I am working on it and will get back to you as soon as I have an answer.

    Kind regards,

    Franziskus Hillreiner

  • Franziskus san

    Thank you for your help and cooperation!
    We are looking forward to your reply.

    Kind regards,

    Hirotaka Matsumoto
  • Matsumoto-san,

    Please find the answers to your questions below.

    [Q1]

    J6 allows adding an RC low-pass filter to one of the outputs. This is needed for measuring the actual output signal waveform with a scope. Without a low-pass filter, you only see the PWM signal and not the actual waveform. For example, if you populate C7, you can put a scope across headers 2 and 3 of J6 and perform measurements.

    [Q2]

    What exactly do you mean with IN-THD and the method for it? Could you please explain in more detail?

     

    [Furthermore]

    You are right, when the boost converter is shut down (push S1), no voltage is supplied to the Class-D amplifier causing the amplifier to power off. The boost supplies the Class-D amplifier (pin 16 and pin 17 are connected).

    The datasheet does not say how the part behaves if SDd is not connected. I think there might be an internal pull down to ground and thus the Class-D might be powered off. I can have a closer look at this with an EVM if you want me to.

    If you have any further questions, please let me know. 

    Kind regards,

    Franziskus Hillreiner

  • Franziskus san,


    Thank you for your reply.

    We'd like to explain Q2.

    On the datasheet P3, followings show.(Table2)
    -SDb=low,  SDd=high,  Boost Converter=OFF,  ClassD Amp=ON
    -SDb=high,  SDd=high,  Boost Converter=ON,  ClassD Amp=ON

    So, our customer would like to confirm above two patterns using EVM.

    On EVM, SW2 connects to  SDd, SW1 connects to SDd,
    when SW1 is ON(push SW1), no voltage is supplied to the Class-D amplifier
    causing the amplifier to power off.

    That's why, do you have some idea in order to confirm teo patterns(Boost on/off).


    kind regards,

    Hirotaka Matsumoto

  • Matsumoto-san,

    Thank you for your explanation. I think I understand the confusion.

    Table 2 on P3 in the datasheet seems to be missleading, especially line 2:

    SDb=low,  SDd=high,  Boost Converter=OFF,  ClassD Amp=ON

    In order for this scenario to work, the Class-D amplifier needs to be driven by an external power source.

    With SDb=low and SDd=high, the Class-D amplifier is technically still ON. It is just not supplied with power since the EVM configuration provides the power from the internal boost, which is OFF.

    Please also see the comment in the second line of Table 2. It means that if the boost converter is OFF, the Class-D amplifier can still be operated, but needs an external power supply.

     

    I hope this helped to make Table 2 more understandable.

    Kind regards,

    Franziskus Hillreiner

  • Franziskus san,

    Ok, just in case of 
    SDb=low,  SDd=high,  Boost Converter=OFF,  ClassD Amp=ON,
    it needs external power supply to VCC pin header.
    Is our recognition correct?

    Kind regards,

    Hirotaka Matsumoto

  • Matsumoto san,

    Correct, but you need to follow some design rules to bypass the internal boost and power the Class-D amplifier from battery (Vdd). This is described in the TPA2013D1 datasheet on page 20 "Bypassing the boost converter".

    Kind regards,

    Franziskus Hillreiner

  • Franziskus san,

    Ok, we got it.

    Kind regards,

    Hirotaka Matsumoto