Simplest class D ever

[Rikard Nilsson]

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!

[BWRX]

You could use a 555 timer to generate a PWM signal for an integrated output stage.

[Rikard Nilsson]

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.

[BWRX]

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.