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| 型号： | TPA3130D2DAP |
| 厂商： | Texas Instruments |
| 文件页数： | 15/35页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUD PWR 15W STER 32HTSSOP |
| 标准包装： | 46 |
| 系列： | SpeakerGuard™ |
| 类型： | D 类 |
| 输出类型： | 2 通道（立体声） |
| 在某负载时最大输出功率 x 通道数量： | 15W x 2 @ 8 欧姆 |
| 电源电压： | 4.5 V ~ 26 V |
| 特点： | 差分输入，静音，短路和热保护，关机 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 32-HTSSOP |
| 封装/外壳： | 32-TSSOP（0.240"，6.10mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 其它名称： | 296-30432-5 |
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SLOS708C – APRIL 2012 – REVISED NOVEMBER 2013
EFFICIENCY: LC FILTER REQUIRED WITH THE TRADITIONAL CLASS-D MODULATION
SCHEME
The main reason that the traditional class-D amplifier-based on AD modulation needs an output filter is that the
switching waveform results in maximum current flow. This causes more loss in the load, which causes lower
efficiency. The ripple current is large for the traditional modulation scheme, because the ripple current is
proportional to voltage multiplied by the time at that voltage. The differential voltage swing is 2 × VCC, and the
time at each voltage is half the period for the traditional modulation scheme. An ideal LC filter is needed to store
the ripple current from each half cycle for the next half cycle, while any resistance causes power dissipation. The
speaker is both resistive and reactive, whereas an LC filter is almost purely reactive.
The TPA3116D2 modulation scheme has little loss in the load without a filter because the pulses are short and
the change in voltage is VCC instead of 2 × VCC. As the output power increases, the pulses widen, making the
ripple current larger. Ripple current could be filtered with an LC filter for increased efficiency, but for most
applications the filter is not needed.
An LC filter with a cutoff frequency less than the class-D switching frequency allows the switching current to flow
through the filter instead of the load. The filter has less resistance but higher impedance at the switching
frequency than the speaker, which results in less power dissipation, therefore increasing efficiency.
FERRITE BEAD FILTER CONSIDERATIONS
Using the Advanced Emissions Suppression Technology in the TPA3116D2 amplifier it is possible to design a
high efficiency class-D audio amplifier while minimizing interference to surrounding circuits. It is also possible to
accomplish this with only a low-cost ferrite bead filter. In this case it is necessary to carefully select the ferrite
bead used in the filter. One important aspect of the ferrite bead selection is the type of material used in the ferrite
bead. Not all ferrite material is alike, so it is important to select a material that is effective in the 10 to 100 MHz
range which is key to the operation of the class-D amplifier. Many of the specifications regulating consumer
electronics have emissions limits as low as 30 MHz. It is important to use the ferrite bead filter to block radiation
in the 30 MHz and above range from appearing on the speaker wires and the power supply lines which are good
antennas for these signals. The impedance of the ferrite bead can be used along with a small capacitor with a
value in the range of 1000 pF to reduce the frequency spectrum of the signal to an acceptable level. For best
performance, the resonant frequency of the ferrite bead/ capacitor filter should be less than 10 MHz.
Also, it is important that the ferrite bead is large enough to maintain its impedance at the peak currents expected
for the amplifier. Some ferrite bead manufacturers specify the bead impedance at a variety of current levels. In
this case it is possible to make sure the ferrite bead maintains an adequate amount of impedance at the peak
current the amplifier will see. If these specifications are not available, it is also possible to estimate the bead
current handling capability by measuring the resonant frequency of the filter output at low power and at maximum
power. A change of resonant frequency of less than fifty percent under this condition is desirable. Examples of
ferrite beads which have been tested and work well with the TPA3130D2 can be seen in the TPA3130D2EVM
user guide SLOU341.
A high quality ceramic capacitor is also needed for the ferrite bead filter. A low ESR capacitor with good
temperature and voltage characteristics will work best.
Additional EMC improvements may be obtained by adding snubber networks from each of the class-D outputs to
ground. Suggested values for a simple RC series snubber network would be 18
Ω in series with a 330 pF
capacitor although design of the snubber network is specific to every application and must be designed taking
into account the parasitic reactance of the printed circuit board as well as the audio amp. Take care to evaluate
the stress on the component in the snubber network especially if the amp is running at high PVCC. Also, make
sure the layout of the snubber network is tight and returns directly to the GND pins on the IC.
22
Copyright 2012–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA3130D2DAPR | 功能描述:音频放大器 15W Filter-Free Cl D Stereo Amp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA3130D2EVM | 功能描述:音频 IC 开发工具 TPA3130D2 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA3131D2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:4W, 25W Filter-Free Class-D Stereo Amplifier with AM Avoidance |
| TPA3131D2EVM | 制造商:Texas Instruments 功能描述:TPA3131D2EVM - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:EVAL BOARD FOR TPA3131D2 制造商:Texas Instruments 功能描述:EVAL BOARD, TPA3131D2 AUDIO AMP, Silicon Manufacturer:Texas Instruments, Silicon Core Number:TPA3131D2, Kit Application Type:Amplifier, Application Sub Type:Audio Power Amplifier - Class D, Kit Contents:Board, Guide 制造商:Texas Instruments 功能描述:, Silicon Manufacturer:Texas Instruments, Silicon Core Number:TPA3131D2, Kit App |
| TPA3131D2RHBR | 制造商:Texas Instruments 功能描述:TPA3118 IN RHB PACKAGE |
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