原标题：TI TAS5441－Q1 22W汽车D类音频放大器解决方案

　　TI公司的TAS5441-Q1是 22W模拟输入单路数字D类音频放大器,能从14.4V汽车电池向4 Ω负载提供多达22W,THD+N小于10%.器件工作范围宽4.5-V 到18-V,效率极好85%. TAS5441-Q1具有七个主要设计区块:PWM,栅极驱动,功率FET,诊断,保护,电源和I2C串行通信总线.器件满足汽车应用的AEC-Q100 规范,工作温度–40℃ 到 125℃差分模拟输入,具有单路BTL数字功率放大器,电源抑制比(PSRR)75dB,具有负载诊断功能如负载开路和短路以及输出到地和输出到电源短路等.40V抛负载保护per ISO-7637-2.主要用在汽车紧急呼叫 (eCall) 放大器,远程信息处理系统,仪表盘系统和信息娱乐音频.中电网为您整理如下详细资料,本文介绍了TAS5441-Q1主要特性,功能框图, 典型应用电路图以及评估模块TAS5441-Q1 EVM主要特性,电路图,材料清单和PCB设计图.

　　The TAS5441-Q1 is a mono digital audio amplifier, ideal for use in automotive emergency call (eCall), telematics, instrument cluster, and infotainment applications. The device provides up to 22 W into 4 Ω at less than 10% THD+N from a 14.4-Vdc automotive battery. The wide operating voltage range and excellent efficiency make the device ideal for startstop support or running from a backup battery when required. The integrated load-dump protection reduces external voltage clamp cost and size, and the onboard load diagnostics report the status of the speaker through I2C.

　　The TAS5441-Q1 is a mono analog-input audio amplifier for use in the automotive environment. The design uses an ultra-efficient class-D technology developed by Texas Instruments, but with features added for the automotive industry. The class-D technology allows for reduced power consumption, reduced heat, and reduced peak currents in the electrical system. The device realizes an audio sound system design with smaller size and lower weight than traditional class-AB solutions.

　　The TAS5441-Q1 device has seven core design blocks:

　　• PWM

　　• Gate drive

　　• Power FETs

　　• Diagnostics

　　• Protection

　　• Power supply

　　• I2C serial communication bus

　　TAS5441-Q1主要特性:

　　• AEC-Q100 Qualified for automotive applications

　　– Temperature grade 1: –40℃ to 125℃, TA

　　• Mono BTL Digital power amplifier

　　• 22-W Output power at 10% THD+N into 4 Ω

　　• 4.5-V to 18-V Operating range

　　• 85% Efficiency into 4 Ω

　　• Differential analog input

　　• Speaker Guard™ speaker protection with adjustable power limiter

　　• 75-dB Power-supply rejection ratio (PSRR)

　　• Load diagnostic functions:

　　– Open and shorted output load

　　– Output-to-power and output-to-ground shorts

　　• Protection and monitoring functions:

　　– Short-circuit protection

　　– 40-V Load dump protection per ISO-7637-2

　　– Output DC Level detection while music is playing

　　– Overtemperature protection

　　– Overvoltage and Undervoltage protection

　　• Thermally enhanced 16-Pin HTSSOP (PWP) package with PowerPAD™ package (pad down)

　　• Designed for automotive EMC requirements

　　• ISO9000: 2002 TS16949 certified

　　• 40 V Load dump protection in standby

　　• Non-blocking I2C in standby

　　TAS5441-Q1应用:

　　• Automotive Emergency Call (eCall) Amplifier

　　• Telematics Systems

　　• Instrument Cluster Systems

　　• Infotainment Audio

　　图1. TAS5441-Q1功能框图

　　图2. TAS5441-Q1典型应用电路图

　　评估模块TAS5441-Q1 EVM

　　The TAS5441-Q1 evaluation module (EVM) is intended to demonstrate the capabilities of the TAS5441- Q1 device. All the device features can be accessed through the hardware and the software graphical user interface (GUI) which is supplied. This user’s guide contains a description of the EVM and the GUI. The schematic, bill of materials (BOM), and board layout are included.

　　The TAS54411Q1EVM showcases the TI TAS5441-Q1 analog input class-D closed-loop mono amplifier.

　　The EVM is usable as stand-alone platform with default I2C register settings. The EVM runs in default I2C register settings, without the need of initialization The EVM can also work with the Purepath™ Console (PPC3) graphical user interface plug-in for programming the I2C register settings.

　　评估模块TAS5441-Q1 EVM主要特性:

　　• Runs without I2C initialization

　　• Has a control GUI via USB