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,1W4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 POWERSTAGEThe TAS5612 is a high performance analog input Class D amplifierwith integrated closed loop feedback technology (known as PurePath™HD) with the ability to drive up to 125W(1) Stereo into4 to 8 Speakers from a single 32.5V supply.PurePath™ HD technology enables traditional AB-Amplifierperformance (<0.03% THD) levels while providing the powerefficiency of traditional class D amplifiers.Unlike traditional Class D amplifiers, the distortion curve onlyincreases once the output levels move into clipping.PurePath™ HD technology enables lower idle losses making the deviceeven more efficient.TAS5612主要特性:PurePath™ HD Enabled IntegratedFeedback Provides: Signal Bandwidth up to 80kHz for High FrequencyContent 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 StartupPin compatible with TAS5631, TAS5616 and TAS5614 Multiple Configurations Possible on the Same PCB With StuffingOptions: Mono Parallel Bridge Tied Load (PBTL) Stereo Bridge TiedLoad (BTL) 2.1 Single Ended Stereo Pair and Bridge Tied LoadSubwooferTotal Output Power at 10%THD+N 250W in Mono PBTL Configuration 125Wper Channel in Stereo BTL ConfigurationTotal Output Power in BTL configuration at 1%THD+N 130W Stereo into 3 105W Stereo into 4 70W Stereo into 6 55W Stereo into 8TAS5612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
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