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| 型号： | TPA6100A2D |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.05 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 11/14页 |
| 文件大小： | 445K |
| 代理商： | TPA6100A2D |
www.ti.com
POWER SUPPLY DECOUPLING, C
S
MIDRAIL BYPASS CAPACITOR, C
B
1
C
B
55 k
v
1
C
I RI
(6)
OUTPUT COUPLING CAPACITOR, C
C
fc +
1
2p R
L CC
(7)
TPA6100A2D
SLOS269B – JUNE 2000 – REVISED SEPTEMBER 2004
APPLICATION INFORMATION (continued)
The TPA6100A2D 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 (CB) serves several important functions. During start-up, CB 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 can
not 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 55-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 CB is 1 F, CI is 1 F, and RI is 20 k. Inserting these values into
Equation 6 results in: 18.18
≤ 50 which satisfies the rule. Bypass capacitor (C
B) values of 0.47-F to 1-F
ceramic or tantalum low-ESR capacitors are recommended 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 CC are required to pass low frequencies into the load. Consider the
example where a CC 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.
The output coupling capacitor required in single-supply, SE mode also places additional constraints on the
selection of other components in the amplifier circuit. With the rules described earlier still valid, add the following
relationship:
6
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相关代理商/技术参数 |
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|---|---|
| TPA6100A2D_06 | 制造商:TI 制造商全称:Texas Instruments 功能描述:50-mW ULTRALOW VOLTAGE STEREO HEADPHONE AUDIO POWER AMPLIFIER |
| TPA6100A2DG4 | 功能描述:音频放大器 50mW Ultra Low-Vltg St Headphone Aud 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 |
| TPA6100A2DGK | 功能描述:音频放大器 Ultra Low Voltage 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 |
| TPA6100A2DGKG4 | 功能描述:音频放大器 Ultra Low Voltage 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 |
| TPA6100A2DGKR | 功能描述:音频放大器 Ultra Low Voltage 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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