Electronics Projects, TDA8929T TDA8927J Class D Amplifier Circuit Project article
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Class D Amplifier TDA8927J This integrated circuit includes a terminal switching transistors type DMOS (Double-Diffused MOS), circuits for controlling the transistors and circuits for communication with the control circuit. It is also equipped with a control circuit for detecting the maximum output current and temperature sensor. Further, this circuit is characterized by high efficiency, a relatively large supply voltage range, a small stalled shock and as already mentioned, it also includes thermal protection and protection against short circuit of output terminals.
TDA8929T This integrated circuit contains (for two audio channels) two pulse width modulators (PWM), two analog feedback loops and two input differential amplifiers. Furthermore it contains circuits common to both channels such as the oscillator, all reference sources and control circuits.
Class D Amplifier TDA8927J TDA8929T Circuit
The analog signal is applied to the inputs of differential amplifiers, which signal amplifies with a fixed gain of 30dB. Thus amplified signals are further brought to the non-inverting inputs of comparators and compared with the triangle signal from the internal oscillator. At the output of the comparator creates the PWM signal, which is connected to the output pins SW1 and SW2. The oscillator frequency is set by resistor ROSC connected between pin OSC and a negative power supply voltage VSS This frequency can be calculated according to the relation.
Pin MODE allows you to switch the system between different modes of operation (STAND by, MUTE and OPERATING). The settings of the individual modes is indicated in figure 3.3. In the mode of OPERATING is right the switch is closed and the pin MODE is applied the voltage of +5V. For mode STAND by must be both switches rozepnuty. Pin MODE is thus connected to ground (GND). For the mode MUTE is switched the left switch. In this mode, will only occur to inhibit the output audio signal.
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