TDA7498设计的100W+100W D类音频放大技术

liyf

ST公司的TDA7498是100W+100W双BTL D类音频放大器,主要用在家庭影院和有源扬声器. TDA7498单电源10-39V工作,效率高达90%,增益设定为25.6 dB, 31.6 dB, 35.1 dB和37.6 dB, 在THD = 10%, RL = 6欧姆和VCC = 36 V时的输出功率为100W+100W.本文介绍了TDA7498主要特性, 内部方框图, 特性测量电路图, 6和8欧姆扬声器应用电路图以及待机和静音电路图, 6和8欧姆扬声器LC滤波器电路图.

TDA7498:100 W + 100 W dual BTL class-D audio amplifier.

The TDA7498 is a dual BTL class-D audio amplifier with single power supply designed for home systems and active speaker applications. It comes in a 36-pin PowerSSO package with exposed pad up (EPU) to facilitate mounting a separate heatsink.

TDA7498主要特性:

100 W + 100 W output power at THD = 10% with RL = 6ohm ?and VCC = 36 V

Wide range single supply operation (10 - 39 V)

High efficiency (?= 90%)

Four selectable, fixed gain settings of nominally 25.6 dB, 31.6 dB, 35.1 dB and 37.6 dB

Differential inputs minimize common-mode noise

Standby and mute features

Short-circuit protection

Thermal overload protection

Externally synchronizable




图1.TDA7498内部方框图(仅显示一路)



图2.TDA7498特性测量电路图



图3.TDA7498 6欧姆扬声器应用电路图



图4.TDA7498 8欧姆扬声器应用电路图



图5.TDA7498 待机和静音电路图



图6.TDA7498 8欧姆扬声器LC滤波器电路图



图7.TDA7498 6欧姆扬声器LC滤波器电路图



图8.TDA7498 主从连接框图