100W class D sound amplifier based on the TPA3116

Greetings, my name is David Quintero, I am a technician in electronics and communications, and I like to design sound amplifiers.

Today I would like to share with you this small, efficient and very powerful class D amplifier design.

at the same time I want to recommend that the input capacitors should have a capacity not less than 1000uf since if the amplifier works at maximum power it could have a high current demand, then the capacitors should withstand it to maintain a voltage for the amplifier, Personally, I recommend the use of good power speakers, to be able to use 100% of the power of this great amplifier, additionally I want to highlight that this amplifier has protection against overtemperature, that is, if the amplifier detects a very high temperature, it will protect itself and It will stop working until it cools down, this is very useful since in many occasions we do not have the changes that can occur in the environment, so this circuit is of great help.

This small amplifier has a power of 100 W RMS at 3 O, in general this integrated is widely used in very good quality speakers thanks to its efficiency, small size, and great power, I want to make clear the fact that, that a amplifier is class D does not mean that it does not consume, it only means that of what it consumes, it wastes very little, taking this into account we must think of a very good quality power source, to have a clean and powerful sound.

I would like to present at this very moment the younger brother of the TPA3116, the TPA3118, which with 60 W RMS of power, becomes an excellent candidate for medium power projects, or failing that we could make a 2.1 system using two TPA3118s for high and medium , and 1 TPA3116 in bridge mode for the bass, designing a high quality and very powerful amplifier, I want to emphasize that this same PCB design works for both the TPA3116 and the TPA3118, since they are pin-to-pin compatible, the only difference important in addition to power, is the way they dissipate heat, in the TPA3116 we will have to use force a heat sink above the integrated one and secure it with screws, on the other hand its younger brother, the TPA3118, dissipates heat by means of a thermal pad that is soldered directly to the PCB, so it will use the PCB as a heatsink and it will not be necessary to use an additional heatsink, this is of vital importance since if the union between the integrated and The heatsink is soldered, it will transfer the heat in a more efficient and fast way, ensuring a long useful life to the amplifier circuit.

But not everything is perfect, this implies that the PCB must be designed very calmly, because it will have to be designed with a large area of ​​copper for the correct heat dissipation in it, I would also like to talk about the power supply characteristics of These integrated, which goes from 4.5V to 26V, I personally would not recommend feeding them with more than 22V, this because it is not necessary, since at that voltage it will give its maximum power, if we introduce more voltage, the circuit will lose efficiency, and at the same time it will be more unstable, since we will be working on the maximum limit.

To finish I would like to give some brief indications regarding the inductors and filter capacitors that should be used in this design, I recommend using inductors of the best possible quality, since if the inductor becomes saturated it will lose its properties and therefore its nominal inductance will change. which would drastically affect the performance of the filter, so in this case use specialized inductors for class D amplifiers.

without more to say I say goodbye, greetings to all and thanks for the support :)