ST公司的TDA7498是100W+100W雙BTL D類音頻放大器,主要用在家庭影院和有源揚聲器. TDA7498單電源10-39V工作,效率高達90%,增益設定為25.6 dB, 31.6 dB, 35.1 dB和37.6 dB, 在THD = 10%, RL = 6歐姆和VCC = 36 V時的輸出功率為100W+100W.本文介紹了TDA7498主要特性, 內部方框圖, 特性測量電路圖, 6和8歐姆揚聲器應用電路圖以及待機和靜音電路圖, 6和8歐姆揚聲器LC濾波器電路圖.
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
圖1.TDA7498內部方框圖(僅顯示一路)
圖2.TDA7498特性測量電路圖
圖3.TDA7498 6歐姆揚聲器應用電路圖
圖4.TDA7498 8歐姆揚聲器應用電路圖
圖5.TDA7498 待機和靜音電路圖
圖6.TDA7498 8歐姆揚聲器LC濾波器電路圖
圖7.TDA7498 6歐姆揚聲器LC濾波器電路圖
圖8.TDA7498 主從連接框圖
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