420w class d amplifier based on the tda8954th – Sponsor – PCBWay

My project is a 420w 8Ω class d amplifier with the tda8954th, I decided to carry out this project because many times students find it difficult to work with smd components, mainly due to lack of experience, so I want to carry out this great project and serve as motivation for all those who want to start working with class d amplifiers professionally and with the best quality PCB, another reason that led me to carry out this project is that the integrated TDA8954TH has a very bad reputation thanks to the fact that it is They sell amplifier boards with the same integrated, but these are of very poor quality and end up being damaged very quickly, this is because the components with which they are built are very limited so they do not fully meet the needs of this great integrated, with this PCB that I designed I want to make known that the integrated is one of the best there is if you work with top quality components and hand with an optimal design, I want all the people who are afraid to work with these surface mount ICs to be encouraged to order PCBs and see how wonderful the smd world is with the best quality PCBs.

The operation of this amplifier is based on the integrated TDA8954TH which is a class D amplifier with a great sound quality easily comparable to that of a class AB amplifier but with a remarkable efficiency of up to 93%, in this design the integrated will be operating in BTL configuration for which it will deliver a power of up to 420w with a THD of 10%, the design consists of a led which will indicate if the amplifier is on or not.

The amplifier consists of two pins which, if bridged, will immediately send the amplifier to standby.

Due to the high output current of up to 12 amps that this amplifier is capable of supplying, it was decided to leave the tracks that go to pins 16 and 21 without antisolder so that later they are tinned and in this way improve their conductivity and the efficiency of the circuit.

This design was made on a two-layer PCB which will provide greater stability for the amplifier and also avoid possible interference.

the lc filter of this amplifier will be composed of two special inductors for class D ED0006 of 20µH and two polyester capacitors with a capacity of 470 nF, which together with the inductors will give it a very good sound clarity.

Finally, I recommend that to power this amplifier a symmetric source of 40 v and 6 amps is used, to have a better sound quality I recommend using a preamplifier and a generous capacitor bank for the source of this amplifier.

I want to thank PCBWay for giving me this great opportunity to publicize my projects and at the same time for the support they provide to all students and engineers to fulfill their dreams and make their projects come true.