TI公司的TAS5441-Q是单路D类音频放大器,能从14.4Vdc汽车电池向4 Ω负载提供THD+N小于10%的高达22W功率.满足 AEC-Q100汽车规范,工作电压4.5V到18V, 4 Ω负载时的效率85%,差分模拟输入,75dB电源抑制比例(PSRR),具有负载诊断功能如开路和短路输出负载,输出对电源和输出对地短路.保护和检测功能包括有短路保护,40V负载突降保护per ISO-7637-2,播放音乐时输出DC电平检测,超温保护以及过压和欠压保护.主要用在汽车紧急呼叫(eCall)放大器,汽车通讯系统,仪表盘系统和信息娱乐音频.本文介绍了TAS5441-Q主要特性,功能框图,应用电路,评估板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 class-D 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.

TAS5441-Q主要特性:

• AEC-Q100 Qualified for automotive applications

– Temperature grade 1: –40°C to 125°C, 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-Q应用:

• Automotive Emergency Call (eCall) Amplifier

• Telematics Systems

• Instrument Cluster Systems

• Infotainment Audio

图1. TAS5441-Q功能框图

图2. TAS5441-Q典型应用电路图

评估板TAS5441-Q1 EVM

TheTAS5441-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 users guide contains a description of the EVM and the GUI. The schematic, bill of materials (BOM), and board layout are included.

图3. 评估板TAS5441-Q1 EVM外形图

图4. 评估板TAS5441-Q1 EVM电路图:XMOS控制

图5. 评估板TAS5441-Q1 EVM电路图:功率放大器

图6. 评估板TAS5441-Q1 EVM电路图:电源

评估板TAS5441-Q1 EVM材料清单:

图7. 评估板TAS5441-Q1 EVM PCB设计:正面

图8. 评估板TAS5441-Q1 EVM PCB设计:背面