Bridge power amplifiers. Part one, single channel. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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It turned out to be a cool name - I liked it myself - I will have to file a patent application.

I decipher - we will talk about simple integrated power amplifiers with more or less decent output power and a minimum of outboard components. We are talking about 1-, 2- and 4-channel class AB amplifiers.

In the first part, as the name suggests, we will look at 1-channel.

Let's start with TDA7256manufactured by SGS Thomson, st.com.

This is a class AB bridge power amplifier. It has protection against short circuit at the output, short circuit of the output to ground, short circuit of the output to the supply voltage; differential input, Mute and Stand By modes. It can work on a load with a resistance of 4 or 2 ohms.

The main features are as follows

Inclusion circuit

The microcircuit is made in the Multiwatt 11 package, it is wonderfully attached to the radiator, especially considering that the flange is electrically connected to a common wire and, thus, a bunch of microcircuits can be hung on one radiator at once, without worrying about gaskets and other nonsense.

The next microcircuit - of the same office - is called TDA2050. This is also a class AB bridge amplifier, however, more sophisticated in terms of output power and at the same time in a simpler package, which means that the printed circuit board for it will be simpler. The microcircuit is also equipped with output short circuit protection, thermal protection.

The main features are as follows

Inclusion circuit

The microcircuit is made in a Pentawatt V package and does not cause any trouble when attaching it to a radiator. In my opinion - a very successful microcircuit for its use at home. According to the manufacturer, the harmonic coefficient at an output power of 24 watts is only 0,03%, and this is very good. In addition, it can still be made to work with unipolar power, but more on that sometime next time.

For now, we're moving on to the next part of our Brijump story.

Publication: radiokot.ru

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