The TDA7268 is a dual audio power amplifier IC commonly used in LCD TVs. It is designed to deliver high-quality audio output for both left and right channels. Below are the main pin functions of the TDA7268:
Pin 18 (VSINS2) serves as the +12V power input, providing the necessary voltage for the IC to operate efficiently.
Pin 2 (OUT1) is the output pin for the left channel audio signal. It drives the left speaker through a 220μF capacitor, ensuring clean and stable audio transmission.
Pin 3 (SVR) is used for mute control. An external transistor, Q2000 (3904L), acts as the mute control device, which is regulated by resistor R2314 connected to the microprocessor (MCU) M6759.
Pin 4 (IN1) is the input pin for the left channel audio signal. A coupling capacitor, C2213 (470nF), is connected externally to block DC components and allow only AC signals to pass through.
Pin 5 (IN2) is the input pin for the right channel audio signal. Similarly, an external coupling capacitor, C2214 (470nF), is used to ensure proper signal conditioning before amplification.
Pin 6 (S-GND) is the ground connection for the IC, essential for maintaining signal integrity and preventing noise interference.
Pin 7 (OUT2) is the output pin for the right channel audio signal, driving the right speaker via a 220μF capacitor, similar to the left channel.
Pins 9 and 10 are also grounded, contributing to the overall stability and performance of the amplifier circuit.
This detailed configuration makes the TDA7268 a reliable component for audio amplification in modern television systems, offering balanced and clear sound output with efficient power management.
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