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 Class D Switching Power Amplifiers and Power D/A conversion

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 31st January 2009, 02:47 PM #1 diyAudio Member   Join Date: Apr 2008 Car amp? How Much RMS can be obtained from a class D amplifier with 12V @ 60A? approx CHEERS
 31st January 2009, 03:17 PM #2 diyAudio Member     Join Date: Jun 2005 Location: Copenhagen, Denmark 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.
 31st January 2009, 03:27 PM #3 diyAudio Member   Join Date: Jun 2005 Location: Sunderland power (rms) = (V^2/2R)*efficiency for a sine wave since Vrms = Vpeak/root2. regards __________________ Anthony C Smith MAES MinstSCE -I think rain is wet so who am I to Judge-
 31st January 2009, 03:57 PM #4 diyAudio Member   Join Date: Apr 2008 Sorry I dont understand this.. But the Impendance is 2ohm.
 31st January 2009, 04:54 PM #5 diyAudio Member     Join Date: Jun 2005 Location: Copenhagen, Denmark 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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