ClassD output filter equation.

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While searching for design information on classD amp, I came across this information hosted on national.com.

Audio Fundamentals Course 5 - All About Class D Audio Amplifiers

In the link they have given equation for solve the values for L & C for the given RL.
I have put them on mathcad sheet. There if found discrepancy in results.

The equation they have mentioned for finding L & C don't get the same frequency when verified using the mentioned equation.

wondering whats going wrong.

Attached the pdf of mathcad results.
 

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  • Mathcad - LCFIlter for ClassD.pdf
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