NXP TDF8554J I2C总线控制4x45W音频功率放大方案

NXP公司的TDF8554J 是集成了多个电压稳压器和两个功率开关的I2C总线控制的4x45W音频功率放大器.放大器采用基于SOI的BCD工艺,采用互补的DMOS输出级,具有大输出信号和完美的声音质量.器件工作电压可低至6V,I2C总线模式(3.3V和5V兼容),能驱动2欧姆或4欧姆负载,扬声器故障检测,可编程增益 (26 dB和16 dB),主要用在汽车音频系统.本文介绍了TDF8554J 主要特性和优势,方框图, 地线损耗和VP损耗测量电路图,以及测量和应用电路图与PCB元件布局图.

The TDF8554J is one of a new generation of complementary quad Bridge-Tied Load (BTL) audio power amplifiers with full I2C-bus controlled diagnostics, multiple voltage regulator and two power switches intended for automotive applications.

The TDF8554J can operate at a battery voltage as low as 6 V making this amplifier suitable for stop/start-car operation. The amplifier uses a complementary DMOS output stage in a Silicon-On-Insulator (SOI)-based BCD process. The DMOS output stage ensures a high power output signal with perfect sound quality. The SOI-based BCD process ensures a robust amplifier, where latch-up cannot occur, with good separation between the four independent channels with every component isolated and without substrate currents.

The multiple voltage regulator comprises four programmable voltage regulators, one standby regulator and two power switches.
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