TI TPA3251高保真175W D类音频放大器参考设计

TI公司的TPA3251是数字输入和处理的高保真175W D类放大器,采用高端反馈设计和有所有权的高速栅极驱动误差修正(PurePath™ Ultra-HD),具有超低音频失真和优越的音质.器件可对4-Ω负载提供2x175W,对3-Ω负载提供2x220W,D类放大器效率高达90%,主要用在蓝光/DVD接收器,高端HTiB系统,AV接收器,高端条形音响,迷你音响系统,有源扬声器和低音喇叭.本文介绍了TPA3251主要特性,功能框图,系统框图,几种应用电路图以及PurePath™ Ultra-HD评估板TPA3251D2EVM主要特性,电路图,材料清单和PCB设计图.
TPA3251 is a high performance class-D power amplifier that enables true premium sound quality with class-D efficiency. It features an advanced integrated feedback design and proprietary high-speed gate driver error correction (PurePath™ Ultra-HD). This technology allows ultra low distortion across the audio band and superior audio quality. The device can drive up to 2 x 175 W into 4-Ω load and 2 x 220 W into 3-Ω load and features a 2 VRMS analog input interface that works seamlessly with high performance DACs such as TI’s PCM5242. In addition to excellent audio performance, TPA3251 achieves both high power efficiency and very low power stage idle losses below 1 W. This is achieved through the use of 60 mΩ MOSFETs and an optimized gate driver scheme that achieves significantly lower idle losses than typical discrete implementations.
TPA3251主要特性:
Differential Analog Inputs
Total Output Power at 10%THD+N
175-W Stereo into 4 Ω in BTL Configuration
220-W Stereo into 3 Ω in BTL Configuration
350-W Mono into 2 Ω in PBTL Configuration
Total Output Power at 1%THD+N
140-W Stereo into 4 Ω in BTL Configuration
175-W Stereo into 3 Ω in BTL Configuration
285-W Mono into 2 Ω in PBTL Configuration
Advanced Integrated Feedback Design with High- speed Gate Driver Error Correction (PurePath Ultra-HD)
Signal Bandwidth up to 100 kHz for High Frequency Content From HD Sources
Ultra Low 0.005% THD+N at 1 W into 4 Ω and <0.01% THD+N to Clipping
60 dB PSRR (BTL...