Sanyo STK428-640 Class-D chip as a voltage regulator?

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Yes, that's what I figured...so I would have to have some kind of LC low pass filter at the output, just like a normal audio amplifiers? If this is the case, the output impedance would have increse along with frequency? Is there any way around it...comes to mind, what if I injected back into the regulator carrier noise, but reverse in phase?
 
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