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參數(shù)資料
| 型號： | TPA2000D4DAPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO32 |
| 封裝： | GREEN, PLASTIC, HTSSOP-32 |
| 文件頁數(shù)： | 14/26頁 |
| 文件大小： | 505K |
| 代理商： | TPA2000D4DAPRG4 |
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TPA2000D4
STEREO 2W CLASSD AUDIO POWER AMPLIFIER
WITH STEREO HP AMPLIFIER
SLOS337B DECEMBER 2000 REVISED NOVEMBER 2005
21
WWW.TI.COM
APPLICATION INFORMATION
output coupling capacitor, CC for HP amplifier
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 14.
(14)
fc +
1
2
pR
L CC
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 3 summarizes the
frequency response characteristics of each configuration.
Table 3. 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 3 indicates, headphone response is adequate and drive into line level inputs (a home stereo for
example) is very 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:
(15)
1
C
B
55 k
v
1
C
I RI
1
R
LCC
power supply decoupling, CS
The TPA2000D4 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.
midrail bypass capacitor, CBYP
The midrail bypass capacitor, CBYP, is the most critical capacitor and serves several important functions. During
start-up or recovery from shutdown mode, CBYP 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 (CBYP) values of 0.47-F to 1-F ceramic or tantalum, low-ESR capacitors are recommended
for the best THD and noise performance.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA2000D4EVM | 功能描述:音頻 IC 開發(fā)工具 TPA2000D4 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| TPA2000D4GQC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AUDIO AMPLIFIER|DUAL|CMOS|BGA|48PIN|PLASTIC |
| TPA2001D1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2001D1_06 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W FILTERLESS MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA2001D1EVM | 功能描述:音頻 IC 開發(fā)工具 TPA2001D1 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)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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