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Class D Switching Power Amplifiers and Power D/A conversion

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Old 31st January 2009, 02:47 PM   #1
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How Much RMS can be obtained from a class D amplifier with 12V @ 60A? approx

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Old 31st January 2009, 03:17 PM   #2
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Depends on impedance and effeciency.

Maximum Power Output = voltage ^ 2 / impedance * effeciency

This gives the theoretical maximum output at 100% distortion.

To get a realistic value at roughly 1% distortion multiply that number with 0.8.

To get the RMS output double impedance.
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Old 31st January 2009, 03:27 PM   #3
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power (rms) = (V^2/2R)*efficiency for a sine wave since Vrms = Vpeak/root2.
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Old 31st January 2009, 03:57 PM   #4
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Sorry I dont understand this..

But the Impendance is 2ohm.
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Old 31st January 2009, 04:54 PM   #5
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Ok then, let's also assume that effeciency is 80% which is typical for a class D playing into 2 ohms impedance

Then ...

Watt (peak) = 12 * 12 / 2 * 0.8 * 0.8 = 46.08

and

Watt (rms) = 12 * 12 / 4 * 0.8 = 28.8
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