參數(shù)資料
型號(hào)： TPA3121D2PWPR
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO24
封裝： PLASTIC, HTSSOP-24
文件頁(yè)數(shù)： 7/30頁(yè)
文件大?。?/td> 749K
代理商： TPA3121D2PWPR
LOUT /ROUT
L
filter
C
filter
LOUT
L
filter
C
filter
L
filter
C
filter
ROUT
www.ti.com
SLOS537A – MAY 2008 – REVISED AUGUST 2010
Table 4. Recommended Filter Output Components
Output Configuration
Speaker Impedance (
)
Filter Inductor (mH)
Filter Capacitor (nF)
4
22
680
Single Ended (SE)
8
33
220
Bridge Tied Load (BTL)
8
22
680
Figure 27. BTL Filter Configuration
Figure 28. SE Filter Configuration
Power-Supply Decoupling, CS
The TPA3121D2 is a high-performance CMOS audio amplifier that requires adequate power-supply decoupling
to ensure that the output total harmonic distortion (THD) is as low as possible. Power-supply decoupling also
prevents oscillations for long lead lengths between the amplifier and the speaker. The optimum decoupling is
achieved by using two capacitors of different types that target different types of noise on the power-supply leads.
For higher-frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR)
ceramic capacitor, typically 0.1 mF to 1 mF, placed as close as possible to the device VCC lead works best. For
filtering lower frequency noise signals, a larger aluminum electrolytic capacitor of 470 mF or greater placed near
the audio power amplifier is recommended. The 470-mF capacitor also serves as local storage capacitor for
supplying current during large signal transients on the amplifier outputs. The PVCC terminals provide the power
to the output transistors, so a 470-mF or larger capacitor should be placed on each PVCC terminal. A 10-mF
capacitor on the AVCC terminal is adequate. These capacitors must be properly derated for voltage and
ripple-current rating to ensure reliability.
Power Supply Rejection
TPA3121D2 has good power supply rejection due to the closed-loop architecture; however, it is possible to
achieve better performance (if desired) by adding a filter between the PVCC supply and the AVCC supply. The
following figures illustrate the improvement that can be obtained by adding a 220
, 220mF filter before pins 19
and 20.
Copyright 2008–2010, Texas Instruments Incorporated
15
Product Folder Link(s): TPA3121D2
相關(guān)PDF資料
PDF描述
TPA3122D2N 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3121D2PWPRG4 功能描述:音頻放大器 15W Stereo Class-D Aud Pwr Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類(lèi)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
TPA3122D2 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER
TPA3122D2EVM 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA3122D2EVM Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類(lèi)型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
TPA3122D2N 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(lèi)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
TPA3123D2 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:25-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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