Power amplifier ICs commonly used in TV circuits and their functional characteristics
1. The model design is complex, and there are differences between Chinese and foreign products. Domestic manufacturers are still catching up. When comparing the main technical specifications of these power amplifier ICs, it's often difficult to distinguish between many models, even when the differences are minimal. This indicates that the audio circuits in TVs lack proper design and optimization, and they rarely follow established standards. In audio systems where empirical data plays a crucial role, design inheritance is a key characteristic. Maintaining this consistency can save significant R&D costs and also bring benefits in production and material management by reducing unnecessary expenses. 2. Most models have low power output. In early TVs (up to 51cm), power amplifiers were mainly mono 2VV. Today, at least a two-channel design is used, and the power per channel has exceeded 6W. 3. Many designs are specialized for TV applications. Examples include Panasonic’s AN52XX series and Sanyo’s LA426X series. Some models, like the AN5250, integrate IF amplification and frequency discrimination circuits. Newer TVs sometimes use universal audio power amplifier ICs. This shift is due to increased audio requirements and reduced costs from technological advancements, leading to more versatile functionality. 4. Power supply configurations are typically single-ended, with OTL, OCL, and BTL circuits becoming more common. The audio system in TVs doesn’t require high power. Using a dual power supply increases circuit complexity. OCL requires dual power supplies to avoid large output capacitors, while BTL can use a single supply and eliminate the need for an output capacitor. Although capacitors have limited impact on sound quality, large ones take up space and are inefficient in TV circuits. BTL circuits, though requiring more components than OCL, are easier to implement in ICs, making them increasingly popular. 5. Class AB and Class C amplifiers are dominant, while Class D remains less common. With growing demands for compact size, heat dissipation, and energy efficiency, the use of Class D amplifiers is expected to grow significantly. 6. On-chip sound control functions are gradually being reduced. Many power amplifier ICs include DC volume control, and some offer basic tone controls. As audio system requirements evolve—such as advanced tone control, balance, subwoofer, surround sound, and environmental effects—some models use dedicated sound control circuits. However, these add complexity and cost. As these features become more accepted, they may eventually be integrated into small signal processing ICs in TVs, leading to a decline in on-chip audio control integration. Smart Power Distribution,Smart Electrical Distribution Panel,Smart Power Distribution Panel,Air Insulated Switchgear ZHONG HAN INTERNATIONAL TRADE CO., LTD , https://www.cck-ht.com