800w class D amplifier made from IRSD900 amplifier

I am a student of electronic engineering at the National University of Colombia, since I was little I have been very passionate about sound and professional audio in general, because in my free time I enjoy the design and implementation of amplifiers, a few months ago I had been working with the classic class AB amplifiers but due to their low energy efficiency, which causes the use of bulky heatsinks, I decided to look for more options, investigating I found the class D amplification that promises an efficiency of up to 95% and a sound quality easily comparable to the of a class AB, at the moment all that this kind of amplification presents are advantages, but given that they work at high frequencies, making them at home becomes a challenge, so it is necessary to implement this type of amplifier in professional plates to avoid strange noises and improve the performance of the same.

The amplifier that I come to present is in essence the Irs-D900 based on the famous IRAUDAMP1 from international rectifier, and although the original design works, I decided to make small modifications to adapt it to my needs and the materials I have to carry out this project for educational.

this amplifier has an output of up to 800w at 4 ohms powered by a dual 80v dc source

This amplifier uses a power supply of up to +/- 80 V DC. Also, a separate 12 volt power supply is required to drive the IR2110 gate driver IC. The consideration that is made separately is due to the fact that it will simplify the scheme even more, since the idea is that this amplifier can be assembled by many students and people who are starting in electronics, so I try to make it as easy as possible armed with this amplifier, with these 800w we can easily feed a medium to a subwoofer without any problem and with a very acceptable sound quality.

Without a doubt, the most important component of this amplifier and of all class D amplifiers is the inductor, so if you want to ensure good sound quality you should use an inductor of the highest possible quality.

One fact that I must highlight is that this amplifier is scalable in power, that is, not necessarily if you manufacture it it has to be 800W, those 800W that I indicate is the maximum that at least for my part I have managed to obtain with this design in simulations, without However, if they do not need a lot of power, they can perfectly feed it from the dual 45v dc and the amplifier should work without problems, on the contrary if a lot of power is required I must remember that the filtering has to be very generous so that the source can support the peaks of current that this large amplifier is capable of generating, in addition to giving it much more stability, although the efficiency of this amplifier is around 87% with irfp250 mosfets it becomes necessary to use a small heatsink to keep it as cold as possible.

I want to give all my thanks to PCBWay for helping me with this great project and also for allowing me to contribute to the PCBWay community about this type of amplifier that often needs experimentation and experience.