NXP TFA9815立体声2x17W音频全桥放大方案

NXP公司的TFA9815是用于高效D类音频功率放大器系统的两路功率比较器,包括有两个全桥BTL功率级,驱动逻辑,保护控制逻辑和全差分输入比较器. TFA9815的工作电压为8 V 到20 V,不需要外接散热器.具有热保护和零死区开关和限流特性,可广泛应用于自振或开环D类音频功率放大,平板电视机和监视器,多媒体系统,无线扬声器以北及高端CRT电视机.本文介绍了TFA9815主要特性,方框图以及典型应用电路图和材料清单.

TFA9815: Stereo full-bridge audio amplifier 2 x 17 W
The TFA9815 is a 2-channel power comparator for high-efficiency class D audio amplifier
systems. It contains two full-bridge Bridge-Tied Load (BTL) power stages, drive logic,

protection control logic and full differential input comparators. By using this power
comparator a compact closed-loop self-oscillating digital audio amplifier system or
open-loop system can be built. The continuous output power is 2 x17 W in a full-bridge
BTL application. The TFA9815 does not require a heat sink and operates using an
asymmetrical supply voltage.

主要特性:
Stereo full-bridge audio amplifier for class D applications
No external heat sink required
Operating voltage range: asymmetrical from 8 V to 20 V
Thermally protected
Zero dead-time switching
Current-limiting (no audible interruptions)

应用:
Self-oscillating or open-loop class D audio amplifier applications
Flat-panel television sets
Flat-panel monitors
Multimedia systems
Wireless speakers
High-end CRT television sets



图1.TFA9815方框图



图2.TFA9815差分输入配置



图3.TFA9815单端输入配置



图4.TFA9815典型应用电路图
典型应用材料清单(BOM):



缓冲网络材料清单: