| Electronic technology occupies a dominant position in the development of theentire appliance industry, with the advances in electronic technology， on the design ofpower amplifier features are constantly updated. Power amplifiers in applications ofdigital products, home appliances are also more widespread, has a very closerelationship with our daily lives. As the standard of living continues to improve, there isa growing emphasis on Visual and audio enjoyment. In most cases, the powerful systemperformance, such as better sound effects, are important factors in prompting consumersto select products. Their primary roles is the first-level input of power amplifier of theaudio signal to a certain work and push the load, in order to get a good sound. Becausethe audio amplifier is stereo and a series of electro-acoustic devices use energy thebiggest part. In today’s society, analog power amplifier has gone through a dozen yearsof continuous improvement and transformation, and its technology has grown to almostthe highest point. Analog power amplifier is based on linear amplifier, power amplifiertube and transistor devices are divided into two types. Power amplifiers quiescent pointsettings they can be divided into class an amplifier, a/b and c class amplifier three.This is a class AB stereo audio power amplifier, for2.4V~5.5V low-power portableand power supply system, the5V power case, can provide1.2W continuous averagepower at8Ω load, THD+N1%. Amplifier gain control of the two ports, GAIN0andGAIN1built-in structure, can be configured to6dB,10dB,15.6dB and21.6dB. Theproject is to design the entire circuit made from the bias circuit and the amplifier. Biassection is used to provide the operational amplifier circuits with suitable voltage biaspoint, and thermal protection of low-power shutdown, shutdown and turn on/off thenoise suppression. |
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