TI公司的TPA31xxD2系列是立体声高效数字功率放大器,能驱动2欧姆扬声器高达100W.工作电压4.5 V – 26 V,效率大于90%,TPA3130D2的高效率可采用单层PCB,不用散热器提供2x15W输出功率, TPA3118D2采用双层PCB, 不用散热器提供2x30W/8欧姆输出功率, TPA3116D2采用小型散热器可提供2x50W/4Ω输出功率,主要用于小/微型元件的条形音箱,后市场汽车电子,CRT TV和消费类音频.本文介绍了TPA31xxD2主要特性,方框图, 应用电路图以及评估板TPA3116D2EVM主要指标,电路图,材料清单和PCB布局图.

The TPA31xxD2 series are stereo efficient, digital amplifier power stage for driving speakers up to 100W/2Ω in mono. The high efficiency of the TPA3130D2 allows it to do 2x15W without external heat sink on a single layer PCB. The TPA3118D2 can even run 2x30W/8Ω without heat sink on a dual layer PCB. If even higher power is needed the TPA3116D2 does 2x50W/4Ω with a small heat-sink attached to its top side PowerPad. All three devices share the same footprint enabling a single PCB to be used across different power levels.

The TPA31xxD2 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 TPA31xxD2 devices 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.

TPA31xxD2主要特性:

Supports Multiple Output Configurations

2×50-W into a 4-Ω BTL Load at 21 V (TPA3116D2)

2×30-W into a 8-Ω BTL Load at 24 V (TPA3118D2)

2×15-W into a 8-Ω BTL Load at 15 V (TPA3130D2)

Wide Voltage Range: 4.5 V – 26 V

Efficient Class-D Operation

>90% Power Efficiency Combined with Low Idle Loss

Greatly Reduces Heat Sink Size

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 Packages

DAD (32-pin HTSSOP Pad-up)

DAP (32-pin HTSSOP Pad-down)

–40℃ to 85℃ Ambient Temperature Range

TPA31xxD2应用:

Mini-Micro Component, Speaker Bar, Docks

After-Market Automotive

CRT TV

Consumer Audio Applications

图1. TPA31xxD2系列方框图

图2. TPA31xxD2系列简化应用电路图

图3. TPA31xxD2系列应用电路图