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参数资料
| 型号： | TPA6111A2DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 8/26页 |
| 文件大小： | 804K |
| 代理商： | TPA6111A2DR |
www.ti.com
POWER SUPPLY DECOUPLING, C(S)
MIDRAIL BYPASS CAPACITOR, C(BYP)
1
C
(BYP)
230 k
v
1
C
I RI
(6)
OUTPUT COUPLING CAPACITOR, C(C)
fc +
1
2p R
L
C
(C)
(7)
TPA6111A2
SLOS313B – DECEMBER 2000 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
The TPA6111A2 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 F, placed as close as possible to the device VDD lead, works best. For filtering
lower frequency noise signals, a larger aluminum electrolytic capacitor of 10 F or greater placed near the power
amplifier is recommended.
The midrail bypass capacitor, C(BYP), serves several important functions. During start-up, C(BYP) determines the
rate at which the amplifier starts up. This helps to push the start-up pop noise into the subaudible range (so low it
cannot be heard). The second function is to reduce noise produced by the power supply caused by coupling into
the output drive signal. This noise is from the midrail generation circuit internal to the amplifier. The capacitor is
fed from a 230-k
source inside the amplifier. To keep the start-up pop as low as possible, the relationship
shown in Equation 6 should be maintained.
As an example, consider a circuit where C(BYP) is 1 F, CI is 1 F, and RI is 20 k. Inserting these values into
Equation 6 results in: 6.25
≤ 50 which satisfies the rule. Recommended values for bypass capacitor C
(BYP) are
0.1 F to 1 F, ceramic or tantalum low-ESR, for the best THD and noise performance.
In the typical single-supply single-ended (SE) configuration, an output coupling capacitor (CC) is required to block
the dc bias at the output of the amplifier, thus preventing dc currents in the load. As with the input coupling
capacitor, the output coupling capacitor and impedance of the load form a high-pass filter governed by
Equation 7.
The main disadvantage, from a performance standpoint, is that the typically small load impedances drive the
low-frequency corner higher. Large values of C(C) are required to pass low frequencies into the load. Consider
the example where a C(C) of 68 F is chosen and loads vary from 32 to 47 k. Table 1 summarizes the
frequency response characteristics of each configuration.
Table 1. Common Load Impedances vs Low Frequency
Output Characteristics in SE Mode
RL
CC
LOWEST FREQUENCY
32
68 F
73 Hz
10,000
68 F
0.23 Hz
47,000
68 F
0.05 Hz
As Table 1 indicates, headphone response is adequate and drive into line level inputs (a home stereo for
example) is good.
16
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| TPA6111A2DRG4 | 功能描述:音频放大器 Stereo Headphone Pin Compat 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 |
| TPA6111A2EVM | 功能描述:音频 IC 开发工具 TPA6111A2 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 |
| TPA6112A2 | 制造商:TI 制造商全称:Texas Instruments 功能描述:150-mW STEREO AUDIO POWER AMPLIFIER |
| TPA6112A2_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:150-mW STEREO AUDIO POWER AMPLIFIER |
| TPA6112A2DGQ | 功能描述:音频放大器 Stereo Diff Input Stereo Headphone 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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