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参数资料
| 型号： | TPA3117D2RHBT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | AUDIO AMPLIFIER, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 14/30页 |
| 文件大小： | 850K |
| 代理商： | TPA3117D2RHBT |
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Ci
IN
Zi
Zf
Input
Signal
f=
1
2
Z C
p
i
f
=
c
1
2
Z C
p
i
-3dB
fc
C =
i
1
2
Z f
p
i
c
www.ti.com
SLOS672 – OCTOBER 2010
INPUT RESISTANCE
Changing the gain setting can vary the input resistance of the amplifier from its smallest value, ±20%, to the
largest value, ±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.
(2)
INPUT CAPACITOR, CI
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 3.
(3)
The value of CI is important, as it directly affects the bass (low-frequency) performance of the circuit. Consider
the example where ZI is 60 k and the specification calls for a flat bass response down to 20 Hz. Equation 3 is
reconfigured as Equation 4.
(4)
In this example, CI is 0.13 F; so, one would likely choose a value of 0.15 mF 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 3 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.
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s) :TPA3117D2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA3117D2RHBT | 制造商:Texas Instruments 功能描述:; Amplifier Class:D; No. of Channels:2; 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS D 15W QFN-32 |
| TPA3118D2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:15W,30W,50W Filter-Free Class-D Stereo Amplifier Family with AM Avoidance |
| TPA3118D2DAP | 功能描述:音频放大器 50W Stereo Class-D Audio 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 |
| TPA3118D2DAPR | 功能描述:音频放大器 50W Stereo Class-D Audio 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 |
| TPA3118D2EVM | 功能描述:音频 IC 开发工具 TPA3118D2 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 |
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