Class D Amplifier TPA2000D1

Discussion in 'The Projects Forum' started by bouncetherabbit, Oct 25, 2009.

  1. bouncetherabbit

    Thread Starter New Member

    Oct 25, 2009
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    0
    I am using a Class D amplifier TPA2000D1 to amplify my signal. I built the circuit according to the application circuit as shown in the datasheet. I applided a 0.4Vp-p Sine wave at the input. At the output, I have a 1Vp-p square wave output with ALOT of ripples.

    Using a gain of 6dB, I realised that the input/output voltages do not match. Also, why does my output have so much ripples and is a square wave even though the datasheet says that there is no need for a low pass filter at the output?
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,649
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    Hello,

    Can you post the used schematic?

    Greetings,
    Bertus
     
  3. bouncetherabbit

    Thread Starter New Member

    Oct 25, 2009
    10
    0
    Hello, thanks for replying. I've attached the schematic. But because my input is from a waveform generator, i've grounded pins INN and OUTN. And basically my output waveform is very messy.
     
  4. hgmjr

    Moderator

    Jan 28, 2005
    9,030
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    Do you have access to a one-to-one audio transformer? If so, you can use it to isolate the single-ended function generator by passing the signal through the transformer.

    hgmjr
     
  5. Jony130

    AAC Fanatic!

    Feb 17, 2009
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    Seems to me that you mistakenly connect OUTN to GND.
    This circuit works only in "bridge" mode.
     
  6. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    As jony130 says, the amplifier must be driven in "bridge" mode.
    This means that the two inputs (INP and INN) get signals that are 180 ° out of phase.
    The speaker must be connected to the OUTP and OUTN connections.

    Greetings,
    Bertus
     
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