參數(shù)資料
型號： TPA3100D2IRGZRQ1
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁數(shù)： 15/37頁
文件大?。?/td> 1024K
代理商： TPA3100D2IRGZRQ1
Input Resistance
Ci
IN
Zi
Zf
Input
Signal
f=
1
2
Z C
p
i
(1)
Input Capacitor, CI
f
=
c
1
2
Z C
p
i
-3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
TPA3100D2-Q1
SLOS557 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com
Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 16 k
± 20%, to
the largest value, 32 k
± 20%. As a result, if a single capacitor is used in the input high-pass filter, the –3-dB or
cutoff frequency may change when changing gain steps.
The –3-dB frequency can be calculated using Equation 1. Use the ZI values given in Table 1.
In the typical application, an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in Equation 2.
The value of CI is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider
the example where ZI is 20 k and the specification calls for a flat bass response down to 20 Hz. Equation 2 is
reconfigured as Equation 3.
In this example, CI is 0.4 F; so, one would likely choose a value of 0.47 F as this value is commonly used. If
the gain is known and is constant, use ZI from Table 1 to calculate CI. A further consideration for this capacitor is
the leakage path from the input source through the input network (CI) and the feedback network to the load. This
leakage current creates a dc offset voltage at the input to the amplifier that reduces useful headroom, especially
in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When
polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most
applications as the dc level there is held at 2 V, which is likely higher than the source dc level. Note that it is
important to confirm the capacitor polarity in the application. Additionally, lead-free solder can create dc offset
voltages and it is important to ensure that boards are cleaned properly.
22
Copyright 2008, Texas Instruments Incorporated
相關(guān)PDF資料
PDF描述
TPA3100D2RGZR-P 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2RGZT 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
TPA3100D2PHPR 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQFP48
TPA3100D2RGZRG4 21.8 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA3100D2PHP 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPG4 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPR 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2PHPRG4 功能描述:音頻放大器 20 W Stereo Class-D Audio 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
TPA3100D2-Q1 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W STEREO CLASS-D AUDIO POWER AMPLIFIER
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