TI公司的TPA3128D2是低功耗2x30W D類(lèi)數字放大器,具有立體聲效果,PBTL模式能驅動(dòng)高達60 W/ 2 Ω的揚聲器,工作電壓4.5 V 到26 V,效率高達90%,不需要散熱片,主要用在藍牙/無(wú)線(xiàn)揚聲器,條形音響,LCD/LED TV,家庭影院等.本文介紹了TPA3128D2主要特性,功能框圖,應用電路,以及評估模塊TPA3128D2 EVM主要指標,應用連接圖,電路圖,材料清單和PCB設計圖.

The TPA3128D2 devices are stereo efficient, digitalamplifier power stage for driving speakers up to 60 W/ 2 Ω in PBTL mode. The TPA3128D2 has low idlepower loss and helps to extend the battery life ofBluetooth/Wireless speakers and other batterypowered　audio systems. The high efficiency of theTPA3128D2 device allows it to do 2×30 W withoutexternal heat sink on a dual layer PCB. This deviceproposed an efficiency boost Mode, which candynamically reduced the current ripple of the externalLC filter and the idle current.

The TPA3128D2 advanced oscillator/PLL circuitemploys a multiple switching frequency option toavoid AM interferences, which is achieved togetherwith an option of either master or slave option,making it possible to synchronize multiple devices.

The TPA3128D2 devices are fully protected againstfaults with short-circuit protection and thermalprotection as well as overvoltage, undervoltage, andDC protection. Faults are reported back to theprocessor to prevent devices from being damagedduring overload conditions.

TPA3128D2主要特性:

• Supports Multiple Output Configurations
– 2×30W Into a 8-Ω BTL Load at 24 V(TPA3128D2)
• Wide Voltage Range: 4.5 V to 26 V
• Efficient Class-D Operation
– Very Low Idle Current: <23 mA forrecommended LC filter configurations
– Greater than 90% Power Efficiency CombinedWith Low Idle Loss Greatly Eliminates Needfor Heat Sink
– Adaptive Modulation Schemes based onOutput Power
– Smart Amplifier Drivers to Reduce theRequirement for RC Snubbers
• Multiple Switching Frequencies
– AM Avoidance
– Master and Slave Synchronization
– 300-KHz to 1.2-MHz Switching Frequency
• Feedback Power-Stage Architecture With HighPSRR Reduces PSU Requirements
• Programmable Power Limit
• Parallel BTL Mode and Mono-Channel ModeSupport
• Supports Both Single and Dual Power SupplyModes
• Integrated Self-Protection Circuits IncludingOvervoltage, Undervoltage, Overtemperature, DCDetect,and Short Circuit With Error Reporting
• Thermally Enhanced Packages
– DAP (32-Pin HTSSOP Pad Down forTPA3128D2)

TPA3128D2應用:

• Bluetooth/Wireless Speakers
• Soundbars
• Mini-Micro Component, Docks
• LCD/LED TVs
• Home Theaters

圖1.TPA3128D2功能框圖

圖2. TPA3128D2簡(jiǎn)化應用電路圖

圖3. TPA3128D2電路圖

評估模塊TPA3128D2 EVM

The TPA3128D2 EVM customer evaluation module demonstrates the TPA3128D2 integrated circuit fromTexas Instruments (TI). The TPA3128D2 is a 30-W (per channel), efficient stereo digital amplifier powerstage for driving 2 bridge-tied speakers or a single parallel bridge-tied load. This document covers EVMspecifications and design documentation.

圖4.評估模塊TPA3128D2 EVM外形圖
評估模塊TPA3128D2 EVM主要指標:


圖5.評估模塊TPA3128D2 EVM連接示意圖

圖6.評估模塊TPA3128D2 EVM電路圖



圖7.評估模塊TPA3128D2 EVM PCB頂層設計圖

圖8.評估模塊TPA3128D2 EVM PCB底層設計圖