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| 型号： | TPA3120D2PWPR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 6/29页 |
| 文件大小： | 952K |
| 代理商： | TPA3120D2PWPR |
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INPUT CAPACITOR, Ci
f
=
c
1
2
Z C
p
i
–3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
Single-Ended Output Capacitor, CO
SLOS507E – MARCH 2007 – REVISED SEPTEMBER 2007
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 μF; so, one would likely choose a value of 0.47 μF as this value is commonly used. If
the gain is known and is constant, use Zi from Table 2 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.
In single-ended (SE) applications, the dc blocking capacitor forms a high-pass filter with the speaker impedance.
The frequency response rolls of with decreasing frequency at a rate of 20 dB/decade. The cutoff frequency is
determined by
fc = 1/2πCOZL
Table 3 shows some common component values and the associated cutoff frequencies:
Table 3. Common Filter Responses
CSE – DC Blocking Capacitor (μF)
Speaker Impedance (
)
fc = 60 Hz (–3 dB)
fc = 40 Hz (–3 dB)
fc = 20 Hz (–3 dB)
4
680
1000
2200
8
330
470
1000
14
Copyright 2007, Texas Instruments Incorporated
Product Folder Link(s): TPA3120D2
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PDF描述 |
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| TPA3120D2PWP | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
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| TPA3120D2PWPRG4 | 20 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
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相关代理商/技术参数 |
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|---|---|
| TPA3120D2PWPRG4 | 功能描述:音频放大器 25W Stereo Class D Aud Pwr 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 |
| TPA3121D2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3121D2_1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3121D2EVM | 功能描述:音频 IC 开发工具 TPA3121D2EVM 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 |
| TPA3121D2PWP | 功能描述:音频放大器 15W Stereo Class-D Aud Pwr 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 |
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