TI TAS5631 PWM输入300W立体声D类放大方案

TI 公司的TAS5631 是集成了反馈的PWM输入300W立体声(总功率600W)的D类放大器,能从单电源50V向4-8欧姆扬声器提供高达300W立体声,具有传统AB类放大器的性能(<0.03% THD)和D类放大器的电源效率.它的SNR大于100dB,PSRR为80dB,功率级的效率高达88%,主要用于Mini组合系统,AV接收器,DVD接收器和有源扬声器.本文介绍TAS5631主要特性, 功能方框图, 典型系统方框图,几种.

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应用:

• Mini Combo System

• AV Receivers

• DVD Receivers

• Active Speakers

图1.TAS5631功能方框图

图2.TAS5631典型系统方框图

图3.TAS5631带BD调制滤波器的差分(2N)BTL应用电路图

图4.TAS5631带AD调制滤波器的(2N)PBTL应用电路图

图5.TAS5631典型SE应用电路图

图6.TAS5631 2.1系统(2N)输入BTL和(1N)输入SE应用电路图

图7.TAS5631带BD调制滤波器DKD封装的差分BTL应用电路图

TAS5631DKD2EVM评估板

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评估板指标:


图8.TAS5631DKD2EVM外形图(顶视图)

图9.TAS5631DKD2EVM评估板电路图(1)

图10.TAS5631DKD2EVM评估板电路图(2)


图11.TAS5631DKD2EVM评估板电路图(3)

TAS5631DKD2EVM 元件列表: