NXP 公司的TDA8922C是高效率 2x75W D类功率放大器,能向6欧姆扬声器输出2x75W功率,HSOP24和DBS23P封装,工作电压从+/-12.5 V 到 +/-32.5V,单端应用的增益为30dB,BTL应用的增益为36dB,高效率和低噪音,低静态电流,无噪音起动和关断,具有电压保护和输出限流以及ThermalFoldBack (TFB).TDA8922C主要应用在DVD,迷你和微型接收器,家庭影院和大功率扬声器系统.本文介绍了TDA8922C主要特性,方框图和典型应用方框图. 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 6ohm.The TDA8922C is available in both HSOP24 and DBS23P powerpackages. The amplifier operates over a wide supply voltage rangefrom +/-12.5 V to +/-32.5 V and features low quiescent currentconsumption. TDA8922C主要特性: Pin compatible with TDA8950/20C for both HSOP24 and DBS23Ppackages Symmetrical operating supply voltage range from +/-12.5 V to+/-32.5 V Stereo full differential inputs, can be used as stereoSingle-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 outputcurrent 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应用: DVD Mini and micro receiver Home Theater In A Box (HTIAB) system High-power speaker system 图1.TDA8922C方框图 图2.单声道BTL应用的TDA8922C输入配置 图3.TDA8922C典型应用方框图
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