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參數(shù)資料
| 型號(hào)： | TPA3107D2_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 15 W立體聲D類音頻功率放大器 |
| 文件頁數(shù)： | 22/36頁 |
| 文件大?。?/td> | 510K |
| 代理商： | TPA3107D2_07 |
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PRINTED-CIRCUIT BOARD (PCB) LAYOUT GENERAL GUIDELINES
Because the TPA3107D2 is a class-D amplifier that switches at a high frequency, the layout of the printed-circuit
board (PCB) should be optimized according to the following guidelines for the best possible performance.
Decoupling capacitors—The high-frequency 1-
μ
F decoupling capacitors should be placed as close to the
PVCC and AVCC terminals as possible. The VBYP capacitor, VREG capacitor, and VCLAMP capacitor
should also be placed as close to the device as possible. Large bulk power supply decoupling capacitors
should be placed near the TPA3107D2 on the PVCCL, PVCCR, and AVCC terminals.
Grounding—The AVCC decoupling capacitor, VREG capacitor, VBYP capacitor, and ROSC resistor should
each be grounded to analog ground. The PVCC decoupling capacitors and VCLAMP capacitors should each
be grounded to power ground. Analog ground and power ground should be connected at the thermal pad,
which should be used as a central ground connection or star ground for the TPA3107D2.
Output filter—The ferrite EMI filter should be placed as close to the output terminals as possible for the best
EMI performance. The LC filter should be placed close to the outputs.
BASIC MEASUREMENT SYSTEM
This application note focuses on methods that use the basic equipment listed below:
Audio analyzer or spectrum analyzer
Digital multimeter (DMM)
Oscilloscope
Twisted-pair wires
Signal generator
Power resistor(s)
Linear regulated power supply
Filter components
EVM or other complete audio circuit
Figure 28
shows the block diagrams of basic measurement systems for class-AB and class-D amplifiers. A sine
wave is normally used as the input signal because it consists of the fundamental frequency only (no other
harmonics are present). An analyzer is then connected to the APA output to measure the voltage output. The
analyzer must be capable of measuring the entire audio bandwidth. A regulated dc power supply is used to
reduce the noise and distortion injected into the APA through the power pins. A System Two audio
measurement system (AP-II) (Reference 1) by Audio Precision includes the signal generator and analyzer in one
package.
TPA3107D2
SLOS509A–OCTOBER 2006–REVISED NOVEMBER 2006
For an example layout, see the TPA3107D2 Evaluation Module User Manual, (
SLOU190
). Both the EVM user
manual and the thermal pad application note are available on the TI Web site at
http://www.ti.com
.
The generator output and amplifier input must be ac-coupled. However, the EVMs already have the ac-coupling
capacitors, (C
), so no additional coupling is required. The generator output impedance should be low to avoid
attenuating the test signal, and is important because the input resistance of APAs is not high. Conversely, the
analyzer-input impedance should be high. The output resistance, R
OUT
, of the APA is normally in the hundreds
of milliohms and can be ignored for all but the power-related calculations.
Figure 28
(a) shows a class-AB amplifier system. It takes an analog signal input and produces an analog signal
output. This amplifier circuit can be directly connected to the AP-II or other analyzer input.
This is not true of the class-D amplifier system shown in
Figure 28
(b), which requires low-pass filters in most
cases in order to measure the audio output waveforms. This is because it takes an analog input signal and
converts it into a pulse-width modulated (PWM) output signal that is not accurately processed by some
analyzers.
22
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA3107D2EVM | 功能描述:音頻 IC 開發(fā)工具 AUD POWER AMP RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA3107D2PAP | 功能描述:音頻放大器 15W Stereo Class-D Aud Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3107D2PAPG4 | 功能描述:音頻放大器 15W Stereo Class-D Aud Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3107D2PAPR | 功能描述:音頻放大器 15W Stereo Class-D Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3107D2PAPRG4 | 功能描述:音頻放大器 15W Stereo Class-D Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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