NXP TDA8932B D类音频30W功率放大方案

NXP公司的TDA8932B是高效率低功耗D类功率放大器,立体声半桥应用(RL=4欧姆)时可连续提供2x15W输出功率或单声道全桥应用(RL=8欧姆)时提供1x30W功率,播放音乐时不需要散热器.TDA8932B不对称工作电压为10V到36V,对称工作电压为5 V 到18 V.采用全差分输入,具有热保护功能,可用在平板电视机和监视器,多媒体系统,无线扬声器,迷你和微型系统以及家庭音响系统.本文介绍了TDA8932B的主要特性,方框图以及对称电源和非对称电源2xSE和1xBTL的简化应用电路图.

TDA8932B Class-D audio amplifier
The TDA8932B is a high efficiency class-D amplifier with low power dissipation.The continuous time output power is 2 15 W in stereo half-bridge application (RL = 4)or 1 30 W in mono full-bridge application (RL = 8). Due to the low power dissipation the device can be used without any external heat sink when playing music. Due to the implementation of thermal foldback, even for high supply voltages and/or lower load impedances, the device continues to operate with considerable music output power without the need for an external heat sink.
The device has two full-differential inputs driving two independent outputs. It can be used in a mono full-bridge configuration (BTL) or in a stereo half-bridge configuration (SE).
TDA8932B主要特性:


TDA8932B主要特性:
Operating voltage from 10 V to 36 V asymmetrical or5 V to18 V symmetrical
Mono-bridged tied load (full-bridge) or stereo single-ended (half-bridge) application
Application without heat sink using thermally enhanced small outline package
High efficiency and low-power dissipation
Thermally protected and thermal foldback
Current limiting to avoid audio holes
Full short-circuit proof across load and to supply lines (using advanced current protection)
Switchable internal or external oscillator (master-slave setting)
No pop noise
Full-differential inputs
应用:
Flat panel television sets
Flat panel monitor sets
Multimedia systems
Wireless speakers
Mini and micro systems
Home sound sets



图1.TDA8932B方框图



图2.TDA8932B 2xSE简化应用电路图(非对称电源)



图2.TDA8932B 1xBTL简化应用电路图(非对称电源)



图3.TDA8932B 2xSE简化应用电路图(对称电路源)



图4.TDA8932B 1xBTL简化应用电路图(对称电源)