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| TPA3251 高保真175W D类音频放大器参考设计 |
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| 文章来源： 更新时间：2016/6/4 11:56:00 |
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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, No Input Signal)
<60 µV (A-Weighted) Output Noise
>111 dB (A Weighted) SNR
Multiple Configurations Possible:
Stereo, Mono, 2.1 and 4xSE
Click and Pop Free Startup and Stop
90% Efficient Class-D Operation (4 Ω)
Wide 12-V to 36-V Supply Voltage Operation
Self-Protection Design (Including Undervoltage, Overtemperature, Clipping, and Short Circuit Protection) With Error Reporting
EMI Compliant When Used With Recommended System Design
TPA3251应用:
Blu-ray Disk™/DVD Receivers
High End HTiB Systems
AV Receivers
High End Soundbar
Mini Combo Systems
Active Speakers and Subwoofers
图1.TPA3251框图
图2.TPA3251系统框图
图3.TPA3251差分输入BTL应用电路图
图4.TPA3251单端(1N)SE应用电路图
图5.TPA3251差分(2N)PBTL应用电路图
PurePath™ Ultra-HD评估板TPA3251D2EVMTIDA-00874
The TPA3251D2EVM PurePath™ Ultra-HD evaluation module demonstrates the TPA3251D2DDV integrated circuit from Texas Instruments. The TPA3251D2DDV is a high-performance class-D amplifier that enables true premium sound quality with high efficiency class-D technology. It features an advance integrated feedback design and high-speed gate driver error correction (PurePath™ Ultra-HD), which enables ultra-low distortion across the audio band and superior audio quality.
This EVM supports 2 BTL (stereo 2.0) output channels, 1 PBTL (mono 0.1) output channel, 1 BTL plus 2 SE (2.1) output channels, and 4 SE (4.0) output channels configurations. The NE5532 is a High Performance Audio Op Amp designed to allow TPA3251D2DDV operation with differential or single ended input signals to the EVM with differential inputs yielding the optimal performance. TPA3251D2EVM is a complete 2Vrms analog input 2 × 175 W stereo/1 x 350 W mono power amplifier ready for evaluation and excellent listening experience.
图6.评估板TPA3251D2EVM外形图
评估板TPA3251D2EVM主要特性:
Stereo PurePath™ Ultra-HD evaluation module
Self-contained protection system (short circuit, clip and thermal)
Standard 2VRMS differential input or single ended line input
BTL, PBTL and SE output configurations support
Double-sided, plated-through, 2oz. Cu 2 layer PCB layout
图7.评估板TPA3251D2EVM电路图(1)
图8.评估板TPA3251D2EVM电路图(2)
图9.评估板TPA3251D2EVM电路图(3)
图10.评估板TPA3251D2EVM电路图(4)
评估板TPA3251D2EVM材料清单(BOM):
图11.评估板TPA3251D2EVM PCB设计图(1)
图12.评估板TPA3251D2EVM PCB设计图(2)
图13.评估板TPA3251D2EVM PCB设计图(3)
图14.评估板TPA3251D2EVM PCB设计图(4)
图15.评估板TPA3251D2EVM PCB设计图(5)
图16.评估板TPA3251D2EVM PCB设计图(6)
图17.评估板TPA3251D2EVM PCB设计图(7)
图18.评估板TPA3251D2EVM PCB设计图(8)
图19.评估板TPA3251D2EVM PCB设计图(9)
图20.评估板TPA3251D2EVM PCB设计图(10)
图21.评估板TPA3251D2EVM PCB设计图(11) |
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