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IRS20955 Help!

Discussion in 'Electronic Design' started by Himlam8484, Sep 10, 2007.

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  1. Himlam8484

    Himlam8484 Guest

    Hi people,

    I made a class D amplifier circuit with a IC driver IRS20955 and
    Mostfets for output. I test it, but it seem to be wrong. When I input
    PWM signal (50% duty cycle), The output signal's waveform is nearly
    sine wave. Is it right???? An Class D amplifier with PWM(50% duty
    cycle) is output signal should be a DC waveform.

    Can anyone clarify for me?

    Him Lam
     
  2. Phil Allison

    Phil Allison Guest

    "Himlam8484"

    ** Go figure what the output filter does:

    http://www.irf.com/technical-info/appnotes/an-1071.pdf


    Note that the average value of a sine wave is zero.



    ........ Phil
     
  3. Himlam8484

    Himlam8484 Guest

  4. Jamie

    Jamie Guest

    I think you have some misconceptions of a class D amplifier.
     
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