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Class D Switching Power Amplifiers and Power D/A conversion

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Old 11th September 2010, 12:39 PM   #1
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Default +/-12V 5A, 100W filterless class D

Is it possible to get
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Old 12th September 2010, 08:16 AM   #2
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Is it possible to get 100W of power with a 17-0-17V, 5A supply (obtained from 12-0-12 tfr) in fullbridge configuration?
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Old 12th September 2010, 08:18 AM   #3
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Load impedance = 4 ohms
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Old 12th September 2010, 09:09 AM   #4
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The intended circuit looks like this. Does anyone see any problems? Power supply is well capable of 5A.
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File Type: jpg 100W filteless.jpg (128.2 KB, 333 views)
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Old 12th September 2010, 09:15 AM   #5
luka is offline luka  Slovenia
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its not possible to get 100w in any way with 17v into 4R
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Old 12th September 2010, 09:21 AM   #6
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So how much is it going to be max?
50W?
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Old 12th September 2010, 09:24 AM   #7
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i need to get 250W (at least 100W worst) into 4E. I have 25-0-25 3A tfr. Does it seem possible in anyway?
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Old 12th September 2010, 09:25 AM   #8
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even if you bridge you might get as high as ~30V peak into 4ohm which will still not be 100W into 4 ohms.
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Old 12th September 2010, 09:52 AM   #9
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So what power suppply should i use to get
a) 100W into 4 ohms?
and b) 250W into 4 ohms?
and how many amperes?
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Old 12th September 2010, 10:29 AM   #10
Pafi is offline Pafi  Hungary
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30V peak is actually a little more than 100W into 4 ohms. Prms=Vpeak^2/(2*R)=112.5 W. If somebody doesn't know these elementary calculations, then I suggest him not to build any amplifiers.

But for those who are capable of designing something (and have good soldering skill), I recommend TAS5162 or similar power stage for this power level.

Last edited by Pafi; 12th September 2010 at 10:56 AM. Reason: spelling mistake
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