Powerful class D amplifier. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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Hi all. Now we will talk about the power amplifier working in the classroom D. We have already discussed the theory on this issue, it's time to move on to practice. The amplifier is quite powerful - 240 W (though with a harmonic coefficient of 10%). But first things first. So, the amplifier is made on a Philips chip - TDA8924. The microcircuit is relatively new, therefore, relatively expensive. Well, not cheap - this, of course, depends on what to compare with (in a pun).

The main features are as follows

The microcircuit also has protection against short circuit at the output, thermal protection and protection of acoustics from "boom-bang" when turned on and off. In general, it is quite difficult to burn it. Well, of course, the comrade manufacturer is thoroughly disingenuous when he sets such output power values. The thing is that they are given taking into account the coefficient of harmonic distortion - 10%, which is complete bedlam. But, nevertheless, the amplifier is worth taking a closer look at, moreover, even soldering it. And let's talk about real power values ​​a little lower, after we look at the diagram.

(click to enlarge)

The circuit provides two options for switching on the amplifier - both stereo and mono in a bridge circuit. It is especially convenient, in my opinion, to use this amplifier for a subwoofer - it will not seem like a fool to anyone. Speaking of stupid. Agree, 10% is too much. However, with a decrease in the harmonic coefficient, the output power also decreases, but fortunately for us it is not catastrophic. At a perfectly acceptable 0,5%, the amplifier delivers 4 watts to a 70 ohm load in stereo mode and 200 watts in mono mode. By the way, in stereo mode, it can also be connected to a 2-ohm load, then it will give 95 watts at the same 0,5% distortion. The transition from stereo to mono is carried out as follows: reconnect the acoustics, close the jumpers JP3 and JP4 and remove the components R3, R4, C3, C4 and C6. Power is connected to the amplifier as follows:

All this can be mounted on one board, the dimensions are relatively small, especially since the heatsink for the microcircuit needs a purely symbolic one. You can forget about a kilogram of aluminum hanging on the flange of a microcircuit, as is the case with conventional amplifiers. All inductors that are used in this circuit can be bought ready-made. L1-L4 are chokes rated for 4-5A current. L1 and L2 of the amplifier - 10 μH inductances, designed for a current of 6-7A.

Now the list of components is quite voluminous, but of the same type:

Publication: radiokot.ru

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