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參數資料
| 型號： | TPA6021A4N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDIP20 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MS001-AD, DIP-20 |
| 文件頁數： | 9/25頁 |
| 文件大小： | 1823K |
| 代理商： | TPA6021A4N |
www.ti.com
POWER SUPPLY DECOUPLING, C
(S)
MIDRAIL BYPASS CAPACITOR, C
(BYP)
OUTPUT COUPLING CAPACITOR, C
(C)
f
c(high) +
1
2 p R
L
C
(C)
3 dB
fc
(4)
TPA6021A4
SLOS465 – JUNE 2005
The TPA6021A4 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to
ensure 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 audio
power amplifier is recommended.
The midrail bypass capacitor (C(BYP)) is the most critical capacitor and serves several important functions. During
start-up or recovery from shutdown mode, C(BYP) determines the rate at which the amplifier starts up. 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, which appears as degraded PSRR and
THD+N.
Bypass capacitor (C(BYP)) values of 0.47-F to 1-F ceramic or tantalum low-ESR capacitors are recommended
for the best THD and noise performance. For the best pop performance, choose a value for C(BYP) that is equal to
or greater than the value chosen for CI. This ensures that the input capacitors are charged up to the midrail
voltage before C(BYP) is fully charged to the midrail voltage.
In the typical single-supply SE configuration, an output coupling capacitor (C(C)) 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 4.
The main disadvantage, from a performance standpoint, is the load impedances are typically small, which drives
the low-frequency corner higher, degrading the bass response. Large values of C(C) are required to pass low
frequencies into the load. Consider the example where a C(C) of 330 F is chosen and loads vary from 4 , 8 ,
32
, 10 k, and 47 k. Table 2 summarizes the frequency response characteristics of each configuration.
Table 2. Common Load Impedances vs Low Frequency
Output Characteristics in SE Mode
LOWEST
RL
C(C)
FREQUENCY
4
330 F
120 Hz
8
330 F
60 Hz
32
330 F
15 Hz
10,000
330 F
0.05 Hz
47,000
330 F
0.01 Hz
17
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6021A4N | 制造商:Texas Instruments 功能描述:Audio Power Amplifier IC 制造商:Texas Instruments 功能描述:IC, AUDIO POWER AMP, CLASS AB, 2W, DIP20 |
| TPA6021A4NE4 | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA6030A4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:3-W Stereo Audio Power Amplifier with Advanced DC Volume Control |
| TPA6030A4_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-2 STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL |
| TPA6030A4EVM | 功能描述:音頻 IC 開發工具 TPA6030A4 Eval Mod RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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