TI TAS2764数字输入单声道D类音频放大器解决方案
TI公司的TAS2764是具有扬声器IV检测的数字输入单声道D类音频放大器,能有效在小性扬声器驱动大峰值功率.D类放大器能在4 Ω负载提供13W连续功率,在电源12V时THD+N小于1%.器件采用Y桥架构改善了低功率输出和空闲模式时的整体效率.集成的扬声器电压和电流检测提供了扬声器行为的实时监测.电源跟踪峰值电压限制器优化了放大器预留空间.有多个阈值的电压不足保护方案允许在电压下降时降低信号通路的增益.TAS2764的超声波支持所用的器件用于先进的超声波应用如运动和接近检测,手势识别等.多达8个TAS2764通过I2S/TDM和I2C接口共享共同总线.1W时的效率为81%,3W时的效率为85%,噪声门模式的电流为3mA,硬件关断模式的电流<1uA.器件采用30点0.4mm间隔CSP封装.主要用在便携式计算机,平板电脑,无线扬声器和消费类音频设备.本文介绍了TAS2764主要特性, 功能框图和电路图,应用电路图和评估模块TAS2764EVM主要特性,电路图,材料清单和PCB设计图.
The TAS2764 is a mono digital input Class-D audioamplifier optimized for efficiently driving high peakpower into small loudspeakers. The Class-D amplifieris capable of delivering 13 W of continuous power intoa 4 Ω load with less than 1 % THD+N at a supply
voltage of 12 V.
Y-Brige architecture improves overall efficiency at lowlevel of output power and in idle mode.Integrated speaker voltage and current senseprovides for real time monitoring of loudspeakerbehavior. A supply tracking peak voltage limiteroptimizes amplifier headroom. Brownout preventionscheme with multiple thresholds allows reducing the
gain in signal path when the supply drops.
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