TI公司的TPA31xxD2系列是立体声高效数字功率放大器,能驱动2欧姆扬声器高达100W.工作电压4.5 V – 26 V,效率大于90%,TPA3130D2的高效率可采用单层PCB,不用散热器提供2x15W输出功率, TPA3118D2采用双层PCB, 不用散热器提供2x30W/8欧姆输出功率, TPA3116D2采用小型散热器可提供2x50W/4Ω输出功率,主要用于小/微型元件的条形音箱,后市场汽车电子,CRT TV和消费类音频.本文介绍了TPA31xxD2主要特性,方框图, 应用电路图以及评估板TPA3116D2EVM主要指标,电路图,材料清单和PCB布局图.
The TPA31xxD2 series are stereo efficient, digital amplifier power stage for driving speakers up to 100W/2Ω in mono. The high efficiency of the TPA3130D2 allows it to do 2x15W without external heat sink on a single layer PCB. The TPA3118D2 can even run 2x30W/8Ω without heat sink on a dual layer PCB. If even higher power is needed the TPA3116D2 does 2x50W/4Ω with a small heat-sink attached to its top side PowerPad. All three devices share the same footprint enabling a single PCB to be used across different power levels.
The TPA31xxD2 advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences; this is achieved together with an option of Master/Slave option, making it possible to synchronize multiple devices.
The TPA31xxD2 devices are fully protected against faults with short-circuit protection and thermal protection as well as over-voltage, under-voltage and DC protection. Faults are reported back to the processor to prevent devices from being damaged during overload conditions.
TPA31xxD2主要特性:
Supports Multiple Output Configurations
2×50-W into a 4-Ω BTL Load at 21 V (TPA3116D2)
2×30-W into a 8-Ω BTL Load at 24 V (TPA3118D2)
2×15-W into a 8-Ω BTL Load at 15 V (TPA3130D2)
Wide Voltage Range: 4.5 V – 26 V
Efficient Class-D Operation
>90% Power Efficiency Combined with Low Idle Loss
Greatly Reduces Heat Sink Size
Advanced Modulation Schemes
Multiple Switching Frequencies
AM Avoidance
Master/Slave Synchronization
Up to 1.2 MHz Switching Frequency
Feedback Power Stage Architecture with High PSRR Reduces PSU Requirements
Programmable Power Limit
Differential/Single-Ended Inputs
Stereo and Mono Mode with Single Filter Mono Configuration
Single Power Supply Reduces Component Count
Integrated Self-Protection Circuits Including
Over-Voltage, Under-Voltage, Over-Temperature, DC-Detect, and
Short Circuit with Error Reporting
Thermally Enhanced Packages
DAD (32-pin HTSSOP Pad-up)
DAP (32-pin HTSSOP Pad-down)
–40℃ to 85℃ Ambient Temperature Range
TPA31xxD2应用:
Mini-Micro Component, Speaker Bar, Docks
After-Market Automotive
CRT TV
Consumer Audio Applications
图1. TPA31xxD2系列方框图
图2. TPA31xxD2系列简化应用电路图
图3. TPA31xxD2系列应用电路图
评估板TPA3116D2EVM
The TPA3116D2EVM evaluation module (EVM) demonstrates the integrated circuits TPA3116D2 from Texas Instruments (TI).
The TPA3116D2 is a 50-W (per channel), efficient, stereo, digital-amplifier power stage for driving two bridge-tied speakers or a single parallel bridge-tied load. The TPA3116D2 can drive a speaker with an impedance as low as 3.2 Ω (4 Ω typical).
The TPA3116D2 is available in a 32-pin TSSOP.
The TPA3116D2 evaluation module consists of a single 50-W, Class-D, stereo audio power amplifier complete with a small number of external components mounted on a circuit board that can be used to directly drive a speaker with an external analog audio source as the input. The EVM’s default output filter configuration supports LC filter operation, but can easily be configured to support filter-free operation or micro inductors. The EVM can also be configured as a 100-W, Class-D mono audio power amplifier.
Designers can quickly evaluate the sound quality and verify specifications in their application with the TPA3116D2EVM. In addition, the TPA3116D2EVM User’s Guide contains the schematic, layout and bill of materials for a reference design.
评估板TPA3116D2EVM 主要指标:
图4. 评估板TPA3116D2EVM 外形图
[开关电源]超薄灯箱内置防水电源会发热的原因深圳市东方一号电子有限公司专门针对灯箱内置电源发热有一套总结方案如下： 开关管的发热量是由损耗引起的，开关管的损耗由开关过程损耗和通态损耗两部分组成，减小通态损耗可以通过选用低通态电阻的开关管来减小通态损耗；开关过程损耗是由于栅电荷大小及开关时间引起的，减小开关过程损耗可以选择开关速度更快、恢复时间更短的器件来减少。 但更为重要的是通过设计更优的控制方式和缓冲技术来减小损耗，如采用软开关技术，可 OLED在烟叶烘烤自控系统中的应用设计O 引言 近年来，智能控制已经广泛应用于烟叶烘烤系统中。由于烘烤自控系统通常在高温、甚至夏日强光环境下运行，并且烟叶烘烤工艺复杂，烘烤过程数据需要在信息提示下进行人工设定，所以系统需要一种具备高亮度， 请各位帮忙看看这个神奇的元器件拆机一个高压电源，输出应该有5KV/10uA，输出电容从来没见过，麻烦各位帮忙看看有认识的吗？就是这个电容
也可能是二极管
太模糊了
这个清楚一些，应该是电容，看着两侧像是陶瓷基板，
是
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