TI公司的TPA3132D2是一款有效最大驅動2*42W/4Ω揚聲器的立體聲數字功率放大器。TPA3132D2芯片在驅動2*25W/8Ω時，無需使用散熱片，可以通過PCB板底部的功率Pad進行散熱。TPA3132D2芯片具有短路保護、過熱保護、過壓保護、欠壓保護等，在過載的故障情況下，為保護設備會向處理器提供反饋。本文首先介紹芯片的簡介、特性、內部框圖及應用領域，并給出相應設計方案的設計原理圖、元器件列表及PCB元件布局圖。

The TPA3131/32D2 are efficient, stereo digital amplifier power stages for driving speakers with up to 2x42W/4Ω peak power. TPA3131/32D2 operates heatsink-free with cooling to PCB through the bottom side Power-Pad with sustained output power from 2x4W/8Ω (TPA3131D2) to 2x25W/8Ω (TPA3132D2).

The TPA3131/32D2 advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences; this is achieved together with an option of Master/Slave option, making it possible to synchronize multiple devices.

The TPA3131/32D2 are fully protected against faults with short-circuit protection and thermal protection as well as over-voltage, under-voltage and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.

For feature compatible devices see: Power Pad up device 2x50W TPA3116D2, Power Pad down 2x15W TPA3130D2 and 2x30W TPA3118D2.

TPA3132D2主要特性：

Supports Multiple Output Configurations
2×4-W into a 8-Ω BTL Load at 7.4 V (TPA3131D2)
2×25-W into a 8-Ω BTL Load at 19 V (TPA3132D2)
Wide Voltage Range: 4.5 V – 26 V
Automotive Load-Dump Compliant
Efficient Class-D Operation
>90% Power Efficiency Combined with Low Idle Loss for Heat Sink free Operation
Advanced Modulation Schemes
Multiple Switching Frequencies
AM Avoidance
Master/Slave Synchronization
Up to 1.2 MHz Switching Frequency
Feedback Power Stage Architecture with High PSRR Reduces PSU Requirements
Programmable Power Limit
Differential/Single-Ended Inputs
Stereo and Mono Mode with Single Filter Mono Configuration
Single Power Supply Reduces Component Count
Integrated Self-Protection Circuits Including Over-Voltage, Under-Voltage, Over-Temperature, DC-Detect, and Short Circuit with Error Reporting
Thermally Enhanced Package
32-Pin QFN Pad-Down
–40℃ to 85℃ Ambient Temperature Range

TPA3132D2應用：

Laptop Computers and Ultrabooks
Flatpanel TV
Consumer Audio Applications

 
圖1. TPA3132D2內部方框圖

TPA3132D2方案原理圖：

圖2. TPA3132D2方案原理圖

TPA3132D2方案材料清單：




PCB元件布局圖：