NXP 公司的TDA8922C是高效率 2x75W D類功率放大器,能向6歐姆揚(yáng)聲器輸出2x75W功率, HSOP24和DBS23P封裝,工作電壓從+/-12.5 V 到 +/-32.5 V,單端應(yīng)用的增益為30dB,BTL應(yīng)用的增益為36dB,高效率和低噪音,低靜態(tài)電流,無(wú)噪音起動(dòng)和關(guān)斷,具有電壓保護(hù)和輸出限流以及Thermal FoldBack (TFB). TDA8922C主要應(yīng)用在DVD,迷你和微型接收器,家庭影院和大功率揚(yáng)聲器系統(tǒng).本文介紹了TDA8922C主要特性, 方框圖和典型應(yīng)用方框圖.
2x75 W class-D power amplifier
The TDA8922C is a high-efficiency Class D audio power amplifier. Typical output power is 2 x75 W with a speaker load impedance of 6 ohm.The TDA8922C is available in both HSOP24 and DBS23P power packages. The amplifier operates over a wide supply voltage range from +/-12.5 V to +/-32.5 V and features low quiescent current consumption.
TDA8922C主要特性:
Pin compatible with TDA8950/20C for both HSOP24 and DBS23P packages
Symmetrical operating supply voltage range from +/-12.5 V to +/-32.5 V
Stereo full differential inputs, can be used as stereo Single-Ended (SE) or mono Bridge-Tied Load (BTL) amplifier
High output power in typical applications:
SE 2 x75 W, RL = 6 ohm(VDD = 30 V; VSS = 30 V)
SE 2 x60 W, RL = 8 ohm(VDD = 30 V; VSS = 30 V)
BTL 1 x155 W, RL = 8ohm(VDD = 25 V; VSS = 25 V)
Low noise
Smooth pop noise-free start-up and switch off
Zero dead time switching
Fixed frequency
Internal or external clock
High efficiency
Low quiescent current
Advanced protection strategy: voltage protection and output current limiting
Thermal FoldBack (TFB)
Fixed gain of 30 dB in SE and 36 dB in BTL applications
Fully short-circuit proof across load
BD modulation in BTL configuration
TDA8922C應(yīng)用:
DVD
Mini and micro receiver
Home Theater In A Box (HTIAB) system
High-power speaker system
圖1.TDA8922C方框圖
圖2.單聲道BTL應(yīng)用的TDA8922C輸入配置
圖3.TDA8922C典型應(yīng)用方框圖
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