NXP TDA8922C 2x75W D类功率放大方案

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 +/-32.5 V,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Thermal FoldBack (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 x75 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 x75 W, RL = 6 ohm(VDD = 30 V; VSS = 30 V)

SE 2 x60 W, RL = 8 ohm(VDD = 30 V; VSS = 30 V)

BTL 1 x155 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