LM48512 - PowerWise 升压、超低 EMI、单声道、E2S D 类音频功率放大器
LM48512是TI公司的一款扬声器放大器（AB类/D类）产品，LM48512是PowerWise 升压、超低 EMI、单声道、E2S D 类音频功率放大器，本页介绍了LM48512的产品说明、应用、特性等，并给出了与LM48512相关的TI元器件型号供参考。
LM48512 - PowerWise 升压、超低 EMI、单声道、E2S D 类音频功率放大器 - 扬声器放大器（AB类/D类） - 低功耗放大器 - TI公司（Texas Instruments，德州仪器）
产品描述
Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current. The LM48512 also features National’s Enhanced Emissions Suppression (E 2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and simplifies design.
The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels (1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V to 5.5V. The E 2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A low power shutdown mode reduces supply current consumption to 0.04μA.
The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain of the amplifier to limit the output as the battery voltage decreases.
Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
Key Specifications ■ Power Output at VDD = 3.6V RL = 8Ω, THD+N ≤ 1% 1.8W (typ) ■ Efficiency at 3.6V, 800mW into 8Ω 82% (typ) ■ Quiescent Power Supply Current at 3.6V 14.5mA ■ Shutdown current 0.04μA (typ) 产品特性
E 2S System Reduces EMI while Preserving Audio Quality and Efficiency Integrated Boost Converter Supply Voltage Level Detection on Boost Converter Low Power Shutdown Mode "Click and Pop" suppression
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