原标题：TI TAS5412-Q1 双通道汽车级数字音频功放参考设计方案

　　TI公司的TAS5412-Q1是一款用于汽车头部单位和外部放大器的双通道数字音频放大器，它提供了两个通道在总谐波失真及噪声在10%以内，4Ω负载时可达到28W、在2Ω负载时可达到46W。数字PWM拓扑提供了比传统线性放大器更合理的改善效率解决方案。在典型的音乐播放条件下，这减少了一个数量级的放大器功率损耗。该设备包含一个专利的设计,提供了出色的PWM供电排斥，在严酷的电气环境共同实现汽车应用。应用实现效率高而不需要复杂的供电方案。设计允许多个设备的同步。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。

　　The device is a two-channel digital audio amplifier designed for use in automotive head units and external amplifiers. It provides two channels at 28 W into 4 Ω at 10% THD+N from 14.4 V or 46 W into 2 Ω at 10% THD+N. The digital PWM topology provides dramatic improvements in efficiency over traditional linear amplifier solutions. This reduces the power dissipated by the amplifier by a factor of ten under typical music playback conditions. The device incorporates a patented PWM design that provides excellent power-supply rejection in the harsh electrical environment common in automotive applications. Applications attain high efficiency without the need for complicated power supply schemes. The design allows synchronization of multiple devices.

　　The device incorporates all the functionality needed to perform in the demanding OEM applications area, including load diagnostic functions for detecting and diagnosing misconnected outputs.

　　TAS5412-Q1主要特性：

　　TAS5412-Q1 - Single-Ended Input

　　2-Channel Digital Power Amplifier

　　2 Analog Inputs, 2 BTL Power Outputs

　　Typical Output Power per Channel at 10%

　　28 Watts/Ch, Into 4 Ω at 14.4 VDC

　　46 Watts/Ch, Into 2 Ω at 14.4 VDC

　　79 Watts/Ch, into 4 Ω at 24 VDC

　　150 Watts Into 2 Ω at 24 VDC PBTL

　　90 Watts Into 1 Ω at 14.4 VDC PBTL

　　THD+N < 0.02%, 1 kHz, 1 W Into 4 Ω

　　Patented Pop- and Click-Reduction Technology

　　Patented AM Interference Avoidance

　　Patented Cycle-by-Cycle Current Limit

　　75-dB PSRR

　　Four-Address I2C Serial Interface for Device

　　Configuration and Control

　　Channel Gains: 12 dB, 20 dB, 26 dB, 32 dB

　　Load Diagnostic Functions:

　　Output Open and Shorted Load

　　Output-to-Power and -to-Ground Shorts

　　Patented Tweeter Detection

　　Protection and Monitoring Functions:

　　Short-Circuit Protection

　　50-V Load-Dump Protection

　　Fortuitous Open-Ground and -Power Tolerant

　　Patented Output DC Level Detection While Music Is Playing

　　Overtemperature Protection

　　Over- and Undervoltage Protection

　　Clip Detection

　　TAS5412-Q1 - 64-Pin QFP (PHD) PowerPAD Surface-Mount Package

　　Pin Compatible With 4-Channel Devices

　　Designed for Automotive EMC Requirements

　　Will Be Qualified According to AEC-Q100

　　ISO9000:2002 TS16949 Certified

　　–40 to 105°C Ambient Temperature Range

　　TAS5412-Q1应用：

　　Radio Head Units

　　External Amplifiers

　　图1. TAS5412-Q1内部方框图

　　TAS5412-Q1方案介绍：

　　The EVM consists of a single printed-circuit board (PCB) mounted inside a metal chassis for EMC testing. The EVM must have an external I2C controller board to function. The USB-to-I2C controller board connects to a personal computer (PC) through a USB cable. The EVM connects to the I2C controller through a supplied 6-pin DIN cable. The PC needs the graphical user interface (GUI) software to control the EVM.

　　Hardware provided in the EVM modules consists of the EVM, an I2C controller board, a USB cable, a 6-pin DIN cable, and speaker cables.

　　TAS5412-Q1方案材料清单：