TI 公司的TAS5631 是集成了反饋的PWM輸入300W立體聲(總功率600W)的D類放大器,能從單電源50V向4-8歐姆揚聲器提供高達300W立體聲,具有傳統(tǒng)AB類放大器的性能(<0.03% THD)和D類放大器的電源效率.它的SNR大于100dB,PSRR為80dB,功率級的效率高達88%,主要用于Mini組合系統(tǒng),AV接收器,DVD接收器和有源揚聲器.本文介紹TAS5631主要特性, 功能方框圖, 典型系統(tǒng)方框圖,幾種.
The TAS5631 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 300W (1) Stereo into 4 to 8  Speakers from a single 50V 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. Coupled with TI’s Class G power supply reference design for TAS563x, industry leading levels of efficiency can be achieved.
TAS5631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
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
Quad Single Ended Outputs
Total Output Power at 10%THD+N
600W in Mono PBTL Configuration
300W per Channel in Stereo BTL Configuration
145W per Channel in Quad Single Ended Configuration
High Efficiency Power Stage (>88%) With 60-m Output MOSFETs
Two Thermally Enhanced Package Options:
PHD (64-Pin QFP)
DKD (44-Pin PSOP3)
TAS5631應(yīng)用:
• Mini Combo System
• AV Receivers
• DVD Receivers
• Active Speakers
圖1.TAS5631功能方框圖
圖2.TAS5631典型系統(tǒng)方框圖
圖3.TAS5631帶BD調(diào)制濾波器的差分(2N)BTL應(yīng)用電路圖
圖4.TAS5631帶AD調(diào)制濾波器的(2N)PBTL應(yīng)用電路圖
圖5.TAS5631典型SE應(yīng)用電路圖
圖6.TAS5631 2.1系統(tǒng)(2N)輸入BTL和(1N)輸入SE應(yīng)用電路圖
圖7.TAS5631帶BD調(diào)制濾波器DKD封裝的差分BTL應(yīng)用電路圖
TAS5631DKD2EVM評估板
The TAS5631DKD is a high-performance, integrated Stereo Feedback Digital Amplifier Power Stage designed to drive 4-Ω speakers at up to 300 W per channel. The device incorporates the TI Equibit™ technology and is designed to be used with TI’s Equibit™ modulators. This system only requires a passive demodulation filter to deliver a efficiency, quality audio amplification.
TAS5518PAG is a high performance 32 bit (24 bit input) multi channel PurePath™ Digital Pulse Width Modulator (PWM) based on Equibit™ technology with fully symmetrical AD modulation scheme. The device also has Digital Audio Processing (DAP) that provides 48 bit signal processing, advanced performance and a high level of system integration. The device has interfaces for headphone output and Power Supply Volume Control (PSVC).
This EVM is configurable to 2 BTL channels for stereo evaluation or 1 PBTL (parallel BTL) channel for subwoofer evaluation.
This EVM, together with a TI input-USB board 2, is a complete stereo digital audio amplifier system which includes digital input (S/PDIF), analog inputs, interface to PC and DAP features like digital volume control,input and output mixers, automute, tone controls, loudness, EQ filters and dynamic range compression (DRC). There are configuration options for power stage failure protection.
TAS5631DKD2EVM評估板指標:
圖8.TAS5631DKD2EVM外形圖(頂視圖)
圖9.TAS5631DKD2EVM評估板電路圖(1)
圖10.TAS5631DKD2EVM評估板電路圖(2)
圖11.TAS5631DKD2EVM評估板電路圖(3)
TAS5631DKD2EVM 元件列表:
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