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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th November 2008, 09:07 AM   #1
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Default Simplest class D ever

Being almost new to class D, I would be happy to find the simplest possible circuit evere to start with. Preferrably a discrete one so I can see how it works. I searched and found a few suggestions, but they all seemed a bit too complex to start with. Of course, I could try developing something myself, but I reckon somebody here has a thing or two finished already. My intention is to use it as a subwoofer amp, so distorsion and bandwidht are not critical. High power would be nice though....

Thanks in advance!
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Old 9th November 2008, 03:39 PM   #2
BWRX is offline BWRX  United States
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You could use a 555 timer to generate a PWM signal for an integrated output stage.
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Old 9th November 2008, 05:41 PM   #3
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Absolutely, or an OP. Just need some drivers and output devices to beef up the power. 500 watts peak would be perfect.

What do you think of IRF540/9540 ? Fast enough? Or perhaps IRFP240/9240, they can take up to 80 amps of surge current. And if 90% efficiency can be reached, that will only produce 50 watts of heat at full power.

Maybe I should start drawing something in EW.
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Old 9th November 2008, 07:09 PM   #4
BWRX is offline BWRX  United States
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TI's TAS5261 is a high output power, open loop integrated gate driver and output stage in a PSOP36 package. All you need to do is feed it a PWM signal. Or you could certainly use a driver chip and your own discrete output devices.
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