TI公司的TPA3121D2是15W(每路)輸出高效 D類音頻功率放大器,用來驅動阻抗低到4歐姆的單端或BTL配置的立體聲揚聲器. TPA3121D2的工作電壓從10V到26V,22V電源時能向4歐姆負載提供每路15W的功率,廣泛應用在平板電視,DLP TV, CRT TV以及大功率揚聲器.本文介紹了TPA3121D2的主要特性, 功能方框圖和簡化的應用電路,以及單端(SE)配置(8歐姆)的應用電路圖, BTL配置(8歐姆)的應用電路圖和評估板TPA3121D2EVM
的主要特性,電路圖與所用材料清單(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- 歐姆Load From a 24-V Supply
15-W/Ch Stereo Into a 4-歐姆 Load from a 22-V Supply
30-W/Ch Mono Into an 8-歐姆 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

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



圖1. TPA3121D2功能方框圖



圖2. TPA3121D2簡化的應用電路



圖3.帶220歐姆/200歐姆 F AVCC濾波器的應用電路圖



圖4.單端(SE)配置(8歐姆)的應用電路圖



圖5.BTL配置(8歐姆)的應用電路圖
TPA3121D2音頻功率放大器評估板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





圖6. TPA3121D2EVM電路圖

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