TI TAS5612 125W立体声HD数字输入功率放大方案

TI 公司的TAS5612是 125W立体声/250W单声道PurePath™HD数字输入功率放大级,集成了闭环反馈(PurePath™ HD)的高性能模拟输入D类放大器,能从32.5V单电源中向4-8欧姆扬声器提功125W立体声.信号带宽达成80kHz,1W 4欧姆的THD为0.03%,PSRR为80dB,SNR大于100dB.主要用于家庭影院,AV接收器,DVD/蓝光光盘接收器等.本文介绍TAS5612主要特性, 功能方框图, 典型系统框图以及多种应用电路.

TAS5612:125W STEREO / 250W MONO PurePath™ HD DIGITAL-INPUT POWER STAGE

The TAS5612 is a high performance analog input Class D amplifier with integrated closed loop feedback technology (known as PurePath™ HD) with the ability to drive up to 125W⁽¹⁾ Stereo into 4 to 8 Speakers from a single 32.5V supply.

PurePath™ HD technology enables traditional AB-Amplifier performance (<0.03% THD) levels while providing the power efficiency of traditional class D amplifiers.

Unlike traditional Class D amplifiers, the distortion curve only increases once the output levels move into clipping.

PurePath™ HD technology enables lower idle losses making the device even more efficient.

TAS5612主要特性:

PurePath™ HD Enabled Integrated Feedback Provides: Signal Bandwidth up to 80kHz for High Frequency Content From HD Sources Ultralow 0.03% THD at 1W into 4 Flat THD at all Frequencies for Natural Sound 80dB PSRR (BTL, No Input Signal) >100dB (A weighted) SNR Click and Pop Free Startup

Pin compatible with TAS5631, TAS5616 and TAS5614

Multiple Configurations Possible on the Same PCB With Stuffing Options: Mono Parallel Bridge Tied Load (PBTL) Stereo Bridge Tied Load (BTL) 2.1 Single Ended Stereo Pair and Bridge Tied Load Subwoofer

Total Output Power at 10%THD+N 250W in Mono PBTL Configuration 125W per Channel in Stereo BTL Configuration

Total Output Power in BTL configuration at 1%THD+N

130W Stereo into 3

105W Stereo into 4

70W Stereo into 6

55W Stereo into 8

TAS5612主要应用:

• Home Theater Systems

• AV Receivers

• DVD/ Blu-ray Disc™ Receivers

• Mini Combo Systems

• Active Speakers and Subwoofers

图1.TAS5612功能方框图

图2.典型系统框图

图3.带BD调制滤波器的TAS5612差分(2N)BTL应用电路图

图4.带BD调制滤波器的TAS5612 (2N)PBTL应用电路图

图5.带BD调制滤波器DKD封装的TAS5612差分输入BTL应用电路图