TDA7295 Integrated Circuits (ICs)

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TDA7295 is a pulse-width-modulated (PWM) audio amplifier that works in accordance with an advanced Class-D technology. It is a monolithic integrated amplifier based on BiCMOS technology, having built-in protection against short circuits, thermal overload and supply-voltage soaring. It is featured with a moderate total harmonic distortion of 0.5 per cent at 1 kHz, and also with a relatively low quiescent current of 7.5mA. Due to its better power efficiency, greater power output and space effectiveness, the TDA7295 amplifier is becoming popular day by day.The TDA7295 is a single-supply amplifier with a single non-inverting input pin, which can be directly interfaced with pick-up cartridges and mics. In addition, it has a wide supply voltage range from 8V to 40V, and can provide an output power of up to 25W RMS into an 8Ω/4Ω speaker. The device also includes an active low shutdown pin, that can be used to turn off the amplifier, effectively reducing its power consumption.The main feature of the TDA7295 amplifier is its PWM modulation technique. It is a technique that is used to produce a high power output in a much smaller physical space. It works by turning off the amplifier’s high-frequency output transistors in-between the audio signal, creating a pulse width modulation of the signal. The amplitude of the signal is adjusted by controlling the width of the pulses, thus allowing a much lower quiescent current.Inside the TDA7295, the signal is modulated by a comparator that compares the input signal to a sawtooth waveform. The output of the comparator is then processed through a low-pass filter, and then amplified to produce the final output signal. This oscillation is also driven by two local-oscillator coils, which further help in rectifying the difference between the input and the output signals.Moreover, the power efficiency of the TDA7295 is fairly greater, as it provides an efficiency of up to 92%. This not only saves energy, but also reduces heat generated from the amplifier. As a result, it becomes easier to design a small audio amplifier with a lower heat generation. In terms of protection, the TDA7295’s internal circuit has multiple protection circuits for preventing any undesirable operations. The integrated thermal protection prevents the amplifier from any severe thermal damage, and the safe-area protection provides an efficient protection from the constant over-powering or under-powering of the amplifier. It also possesses a ripple-blocking filter for eliminating any undesired AC ripple in the input signal.Therefore, TDA7295 is an ideal choice for audio amplifiers in automotive, home and portable audio applications. Its 4-Figure thermal protection precision, wide operating voltage range, low quiescent current, low total harmonic distortion and the high power efficiency make it suitable to use.

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