TI 公司的TAS5612是125W立體聲/250W單聲道PurePath™HD數字輸入功率放大級,集成了閉環反饋(PurePath™ HD)的高性能模擬輸入D類放大器能從32.5V單電源中向4-8歐姆揚聲器提功125W立體聲.信號帶寬達成80kHz,1W 4歐姆的THD為0.03%,PSRR為80dB,SNR大于100dB.主要用于家庭影院,AV接收器,DVD/藍光光盤接收器等.本文介紹TAS5612主要特性, 功能方框圖, 典型系統框圖以及多種應用電路.
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主要應用:
• Home Theater Systems
• AV Receivers
• DVD/ Blu-ray Disc™ Receivers
• Mini Combo Systems
• Active Speakers and Subwoofers
圖1.TAS5612功能方框圖
圖2.典型系統框圖
圖3.帶BD調制濾波器的TAS5612差分(2N)BTL應用電路圖
圖4.帶BD調制濾波器的TAS5612 (2N)PBTL應用電路圖
圖5.帶BD調制濾波器DKD封裝的TAS5612差分輸入BTL應用電路圖
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