TDA7268 dual audio power amplifier output circuit

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The TDA7268 is a dual audio power amplifier IC commonly used in LCD TVs. It provides high-quality audio output and is designed for efficient power management. Below is an overview of its main pin functions:

Pin 18 (VSINS2) serves as the +12V power input, supplying energy to the entire circuit.

Pin 2 (OUT1) is the left channel audio output. It drives the left speaker via a 220μF capacitor, ensuring clear and distortion-free sound.

Pin 3 (SVR) is the mute control pin. An external transistor Q2000 (3904L) is connected here, which is controlled by resistor R2314 from the microprocessor (MCU) M6759, allowing for volume muting when needed.

Pin 4 (IN1) is the left channel audio input. A coupling capacitor C2213 (470nF) is used externally to block DC and pass only the AC signal.

Pin 5 (IN2) is the right channel audio input. Similarly, an external 470nF capacitor C2214 is used for coupling, ensuring proper signal transmission to the right speaker.

Pin 6 (S-GND) is the ground connection, essential for stable operation and noise reduction.

Pin 7 (OUT2) is the right channel audio output, driving the right speaker through another 220μF capacitor for balanced sound output.

Pins 9 and 10 are also grounded, providing additional stability to the circuit.

This IC is ideal for applications where compact design and reliable performance are required, such as in modern television systems and audio equipment.