Bridge power amplifiers. Part three, four-channel. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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Well, yes - the part number and the number of channels did not agree with us now - what can you do.

Now we will talk about 4-channel amplifiers. For the most part, they are used for automotive use, but, in principle, nothing prevents them from being used at home - their characteristics are quite decent, especially for the latest generation.

Let's start with TDA7560, manufactured by SGS-Thomson. As usual, this is a class AB bridge amplifier with all kinds of protections, Mute and StanBy functions, and, as you will see in the diagram, the almost complete absence of attachments.

Well, this chip also works great for a load of 2 ohms.

The main characteristics are as follows:

Inclusion circuit

That is, in fact, you take a microcircuit, attach inputs and outputs to it, and everything is already working. Story.

This creation is produced in the Flexiwatt25 case - again with half holes on the sides.

Our next patient is a microchip TDA8571J from Philips Semiconductors. With this amplifier, the comrades decided to show off and made it a bridge one, like everyone else, but at the same time - class B. And the rest, as usual, a full set of output protections and temperature protection. Moreover, as with the previous prepared one, there is practically no need for hinged elements.

The main features are as follows

Inclusion circuit

And the amp is naked.

Well, if you just come in to hang up the Mute input. All this happiness is in the SOT411-1 package, again with half holes on the sides.

Everything - on the last and that's enough.

This time the last will be the amplifier TDA8591 all the same Philips Semiconductors. According to its characteristics, it is similar to the previous speaker, but it can work with a 2-ohm load and is somewhat more powerful. Plus, it has a rather clever circuit for detecting constant voltage at the output.

The main features are as follows

Inclusion circuit

(click to enlarge)

Well, in general, nothing particularly terrible, you just need to take into account that for the amplifier to work, the S1 button must be closed. Otherwise, he will be silent like a partisan.

As for the circuit for detecting a constant voltage at the output, then if you don’t need it, you can throw out almost half of the passive components from the circuit. Let's list these heroes by name: R1-R6, C14. And we connect the 26th output of the microcircuit to a common wire.

Well, that's all for now. Of course, we do not end the topic of Brijumps here - in fact, we have just begun it.

Publication: radiokot.ru

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