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參數資料
| 型號： | TPA2000D1GQC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 2 - W型單聲道無濾波器D類音頻功率放大器 |
| 文件頁數： | 9/14頁 |
| 文件大?。?/td> | 205K |
| 代理商： | TPA2000D1GQC |
TPA2000D1
2-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER
SLOS328B
–
JUNE 2000
–
REVISED MAY 2001
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor, C
i
(continued)
The value of C
i
is important, as it directly affects the bass (low frequency) performance of the circuit. Consider
the example where Z
i
is 20 k
and the specification calls for a flat bass response down to 80 Hz. Equation 5
is reconfigured as equation 6.
C
i
1
2 Z
i
f
c
(6)
In this example, C
i
is 0.1
μ
F, so one would likely choose a value in the range of 0.1
μ
F to 1
μ
F. If the gain is known
and will be constant, use Z
i
from Table 1 to calculate C
i
. A further consideration for this capacitor is the leakage
path from the input source through the input network (C
i
) 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 V
DD
/2, which is likely higher than the source dc level. Note that it
is important to confirm the capacitor polarity in the application.
C
i
must be 10 times smaller than the bypass capacitor to reduce clicking and popping noise from power on/off
and entering and leaving shutdown. After sizing C
i
for a given cutoff frequency, size the bypass capacitor to
10 times that of the input capacitor.
(7)
C
i
≤
C
BYP
/ 10
power supply decoupling, C
S
The TPA2000D1 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
μ
F placed as close as possible to the device V
DD
lead works best. For
filtering lower-frequency noise signals, a larger aluminum electrolytic capacitor of 10
μ
F or greater placed near
the audio power amplifier is recommended.
midrail bypass capacitor, C
BYP
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-
μ
F to 1-
μ
F ceramic or tantalum low-ESR capacitors are recommended
for the best THD and noise performance.
Increasing the bypass capacitor reduces clicking and popping noise from power on/off and entering and leaving
shutdown. To have minimal pop, C
BYP
should be 10 times larger than C
i
.
C
BYP
≥
10
×
C
i
(8)
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA2000D1GQCR | 功能描述:音頻放大器 Mono Filter-Free Class-D 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 |
| TPA2000D1PW | 功能描述:音頻放大器 2W Class-D 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 |
| TPA2000D1PW | 制造商:Texas Instruments 功能描述:POWER AMP CLASS-D AUDIO SMD 2000 |
| TPA2000D1PWG4 | 功能描述:音頻放大器 Mono Filter-Free Class-D 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 |
| TPA2000D1PWR | 功能描述:音頻放大器 Mono Filter-Free Class-D 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 |
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