TDA7309

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Audio Special Purpose

TDA7309 is a versatile and high-performance audio amplifier integrated circuit from STMicroelectronics. It combines low noise, high power, low power consumption, and low distortion characteristics, making it ideal for a variety of audio amplification applications. The device is based on a single-ended, low-noise, dual-focused, pulse-width-modulated amplifier that provides very high output power with very low levels of distortion.

Application Field

The TDA7309 is used in many audio amplifier applications, including portable and home audio amplifiers, speaker-level audio systems, personal music players, and sound systems. It is designed to drive speakers in both single-ended and bridged configurations, and can be used as a headset amplifier in portable audio devices. Additionally, it can be used in 1-channel amplifiers, headphone amplifiers, active crossover, and reverberation filtering applications.

Working Principle

The TDA7309 is a single-ended, low-noise, dual-focused pulse-width-modulated amplifier (DF-PWM) that utilizes dynamic power allowing it to achieve very high input power levels even at low supply voltages. This device operates with a dual alternating frequency of 20 kHz and 30 kHz, in order to reduce the switching losses associated with the PWM signal. The signal is applied to the differential positive and negative input pins to control the output signal. This signal is regulated by the high frequency pulse width modulated signal, which is generated by the combination of the two high frequency signals.

The output voltage is regulated by two series connected MOSFETs (Metal Oxide Field Effect Transistors) that act as a switch, allowing the signal to pass through when the PWM signal is applied. This signal is then amplified by five high voltage bipolar audio output transistors, before finally being converted into a low impedance output signal. The output of the chip is protected by a slew rate limiting circuit that limits the rate of change of the output signal in order to prevent the chip from becoming damaged by overvoltage or an unexpected spike in output power.

The TDA7309 is designed to operate in single-ended or bridged modes and has additional features such as thermal protection, self-protection, and a fast turn-off sequence to ensure reliable operation under all conditions. It also has a low distortion level that ensures clear and realistic audio reproduction, providing an overall excellent performance.

The TDA7309 is a highly integrated and versatile audio amplifier IC, suitable for a wide range of audio amplifier applications. With its low noise and high output power, it is an ideal solution for amplifying audio signals in many different setups.

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