IRS20955 Help!

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- Himlam8484
  
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posted
16 years ago

Mon, Sep 10, 2007 3:25 AM

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

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- Phil Allison
  
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posted
16 years ago

Mon, Sep 10, 2007 3:33 AM

"Himlam8484"

** Go figure what the output filter does:

formatting link

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

....... Phil

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- Himlam8484
  
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posted
16 years ago

Mon, Sep 10, 2007 3:49 AM

Thanks for reply, i will check it now!

Him Lam

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- Jamie
  
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posted
16 years ago

Mon, Sep 10, 2007 5:42 PM

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

--
"I\'m never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

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