TI TPA3121D2 15W D类放大方案

TI公司的TPA3121D2是15W(每路)输出高效 D类音频功率放大器,用来驱动阻抗低到4欧姆的单端或BTL配置的立体声扬声器. TPA3121D2的工作电压从10V到26V,22V电源时能向4欧姆负载提供每路15W的功率,广泛应用在平板电视,DLP TV, CRT TV以及大功率扬声器.本文介绍了TPA3121D2的主要特性, 功能方框图和简化的应用电路,以及单端(SE)配置(8欧姆)的应用电路图, BTL配置(8欧姆)的应用电路图和评估板TPA3121D2EVM
的主要特性,电路图与所用材料清单(BOM).

The TPA3121D2 is a 15-W (per channel), efficient, class-D audio power amplifier for driving stereo speakers in a single-ended configuration or a mono speaker in a bridge-tied-load configuration. The TPA3121D2 can drive stereo speakers as low as 4  . The efficiency of the TPA3121D2 eliminates the need for an external heat sink when playing music.
The gain of the amplifier is controlled by two gain select pins. The gain selections are 20, 26, 32, and 36 dB.

主要特性:
10-W/Ch Stereo Into an 8- 欧姆Load From a 24-V Supply
15-W/Ch Stereo Into a 4-欧姆 Load from a 22-V Supply
30-W/Ch Mono Into an 8-欧姆 Load from a 22-V Supply
Operates From 10 V to 26 V
Can Run From +24 V LCD Backlight Supply
Efficient Class-D Operation Eliminates Need for Heat Sinks
Four Selectable, Fixed-Gain Settings
Internal Oscillator to Set Class D Frequency (No External Components Required)
Single-Ended Analog Inputs
Thermal and Short-Circuit Protection With Auto Recovery
Space-Saving Surface Mount 24-Pin TSSOP Package
Advanced Power-Off Pop Reduction

应用:
Flat Panel Display TVs
DLP TVs
CRT TVs
Powered Speakers



图1. TPA3121D2功能方框图



图2. TPA3121D2简化的应用电路



图3.带220欧姆/200欧姆 F AVCC滤波器的应用电路图



图4.单端(SE)配置(8欧姆)的应用电路图




图5.BTL配置(8欧姆)的应用电路图

TPA3121D2音频功率放大器评估板TPA3121D2EVM
TPA3121D2 Audio Power Amplifier Evaluation Module
The TPA3121D2 evaluation module consists of a single 20W, class-D, stereo audio power amplifier complete with a small number of external components mounted on a circuit board that can be used to directly drive speakers with an external analog audio source as the input.

TPA3121D2EVM主要特性:
10-W/Ch Stereo Into an 8 ohm Load From a 24-V Supply
15-W/Ch Stereo Into a 4 ohm Load from a 22-V Supply
30-W/Ch Mono Into an 8 ohm load from a 22-V Supply
Operates From 10 V to 26 V
Able to run From +24 V LCD Backlight Supply
Efficient Class-D Operation Eliminates Need for Heat Sinks
Four Selectable, Fixed-Gain Settings
Internal Oscillator to Set Class D Frequency (No External Components Required)
Single-Ended Analog Inputs
Thermal and Short-Circuit Protection With Auto Recovery
Space-Saving Surface Mount 24-Pin TSSOP Package
Advanced Power-Off Pop Reduction





图6. TPA3121D2EVM电路图

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