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TPA2031D1EVM

Harry Wang29
Prodigy 30 points

1,  Why we can't get a square wave output while when the input wave form is square?

2, Can we get a square wave out put, if inputting a fixed DC voltage since the EVM has a H-bridge circuit? 

3, Is the output of the H-bridge circuit approximately the internal 200K hz signal?

  • 0
    TI__Mastermind 20085 points
    Hello Harry

    Welcome to E2E, thanks for your interest in our products.
    1) Our Class D amplifiers use a comparator in order to generate square waveform. These kind of devices compare a triangular wave (generated internally by the device) and sine wave to form a square waveform. If you set another kind of signal in the device's input won't work properly.
    2) I don't think so, as I mentioned the device needs a sine wave. We can't guarantee the correct operation under these conditions.
    3) The typical switching frequency is 250 kHz, you can refer the amplifier's datasheet to find this information.

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer | LPAA
  • 0
    Prodigy 30 points
    Hi Jose,

    Thanks for help.
    Another question for you. How can we measure the output power?
    We are evaluating the amplifier and intended to use it for a new product. We need to know the board efficiency vs inputs, such as signal Frequency, signal Magnitude and  Vdc.

    Please advise

    Regards,

    Harry Wang
    Senior Development Engineer
    Parker Hannifin Corporation
    Precision Fluidics Division
    45 US 46, Unit 602
    Pine Brook, NJ 07058 USA
    direct 973-439-4887
    fax 973-227-3940
    hywang@parker.com
    www.parker.com/precisionfluidics
    www.hargravesfluidics.com
    Together, we can enable the technologies that improve our lives




  • 0 in reply to Harry Wang29
    TI__Mastermind 20085 points
    Harry,

    You can refer the Parameter Measurement Information section of the amplifier's datasheet to find more information about as you can perform these measurements.

    Best Regards
    Jose Luis Figueroa
    Audio Applications Engineer | A-Team
  • 0
    Prodigy 30 points
    Hi Jose,

    We are still struggle with to evaluate the efficiency of the Audio Power Amplifier.
    Our application is using the APA to drive a solenoid pump shown as attached picture, and it works fine. To characterize the product, we would like to know the board performance at a specific load. We have experimented either a FLUKE-187 true rms multimeter or a oscilloscope to measure outputs of V-rms and I-rms from the APA. Unfortunately, so far, the output power from the Amplifier (input to a load_pump) was always higher than the DC power input of the APA. Since the measurement of DC power is straight forward, there was definitely something wrong regarding the measurement of  output of  the APA V-rms and I-rms.
    Please advice.

    Thanks,
    Harry




  • 0 in reply to Harry Wang29
    TI__Guru* 95145 points
    Hi Harry,

    There are a couple documents you could take a look for details on the audio power amplifiers measurements:
    www.ti.com/.../slyt135.pdf
    www.ti.com/.../slyt128.pdf

    Best regards,
    -Ivan Salazar
    Texas Instruments