TI公司的TAS5412-Q1是一款用于汽車(chē)頭部單位和外部放大器的雙通道數(shù)字音頻放大器，它提供了兩個(gè)通道在總諧波失真及噪聲在10%以內(nèi)，4Ω負(fù)載時(shí)可達(dá)到28W、在2Ω負(fù)載時(shí)可達(dá)到46W。數(shù)字PWM拓?fù)涮峁┝吮葌鹘y(tǒng)線性放大器更合理的改善效率解決方案。在典型的音樂(lè)播放條件下，這減少了一個(gè)數(shù)量級(jí)的放大器功率損耗。該設(shè)備包含一個(gè)專利的設(shè)計(jì),提供了出色的PWM供電排斥，在嚴(yán)酷的電氣環(huán)境共同實(shí)現(xiàn)汽車(chē)應(yīng)用。應(yīng)用實(shí)現(xiàn)效率高而不需要復(fù)雜的供電方案。設(shè)計(jì)允許多個(gè)設(shè)備的同步。本文首先介紹芯片的簡(jiǎn)介、特性、內(nèi)部框圖及應(yīng)用領(lǐng)域，并給出相應(yīng)設(shè)計(jì)方案的設(shè)計(jì)原理圖、元器件列表及PCB元件布局圖。
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應(yīng)用：
Radio Head Units
External Amplifiers
圖1. TAS5412-Q1內(nèi)部方框圖
TAS5412-Q1方案介紹：
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方案原理圖：
 
圖2. TPS92510方案原理圖
TAS5412-Q1方案材料清單：
 
PCB元件布局圖：
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