Reducing the cost and availability of high-bit ADC and digital signal processors have contributed to the emergence of high power amplifiers, D-class, based on pulse-width modulation. Work output transistor stages in a key mode of such amplifiers allows a few, sometimes dozens of times to increase efficiency, thereby reducing heat generation amplifier, its size and cost. Among all the audio amplifier device class D are the most cost-effective, thanks to the use of digital signal processing. It eliminates the possibility of distortion and noise in the pre-amplifier paths, streamlines and simplifies all kinds of linear and nonlinear signal conversion without using mechanical adjustment components, extends the functionality.

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Features chips as follows :

The device has built-in overload protection, output current limiting, suppression of the “click-and-pop” when you turn on and off. There is also a programmable gain amplifier and switch-off temperature.

As can be seen, the device is connected to two power supplies – 22 V – for analog and digital 5-12V. If it is assumed that the chip will be powered by 12 volts, the findings for the power supply can be combined. Otherwise, it is enough to feed the analog part to connect any integral stabilizer – TIPPING or LM.

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IC Features :

In the chip implements two identical channels of amplification and specifications are for the stereo mode of the amplifier. Chip can also operate in mono – in bridged mode. In this case, the output power at CG = 0.5% at 120 watts. The other characteristics remain practically unchanged.
Below is a schematic of the LM4780 Mono channel mode :

Parts list :

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Power amplifier operates in class D power amplifier is powerful enough produces a total output power 240 W (120 W each channel). Much power is generated by a chip made ​​by Philips TDA8924.

Reference Data :

Chip also has a short-circuit proof output, thermal protection and acoustic protection from the “inrush current” when you turn on and off. The scheme provides two options turn on an amplifier – both stereo and mono on a bridge. So this could be used for amplifier subwoofer.

Power to the amplifier is connected to the following scheme :

Parts list :

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