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參數資料
| 型號： | TPA3007D1PWG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 6.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數： | 7/22頁 |
| 文件大小： | 451K |
| 代理商： | TPA3007D1PWG4 |
www.ti.com
Ci
IN
Zi
Zf
Input
Signal
f +
1
2p Z
iCi
(4)
INPUT CAPACITOR, CI
fc +
1
2 p Z
i
C
i
-3 dB
fc
(5)
C
i +
1
2p Z
i fc
(6)
POWER SUPPLY DECOUPLING
SLOS418D – SEPTEMBER 2003 – REVISED MARCH 2008
In the typical application an input capacitor I) is required to allow the amplifier to bias the input signal to the
proper dc level for optimum operation. In this case, CI and the input impedance of the amplifier (ZI) form a
high-pass filter with the corner frequency determined in Equation 5.
The value of CI is important, as it directly affects the bass (low frequency) performance of the circuit. Consider
the example where ZI is 241 k and the specification calls for a flat bass response down to 20 Hz. Equation 5 is
reconfigured as Equation 6.
In this example, CI is 33 nF, so one would likely choose a value of 0.1 F, as this value is commonly used. If the
gain is known and will be constant, use ZI from Table 2 to calculate CI. A further consideration for this capacitor
is the leakage path from the input source through the input network 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 2.5 V, which is likely higher than the source dc level. Note that it is
important to confirm the capacitor polarity in the application.
The TPA3007D1 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 1
F placed as close as possible to the device V
CC 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.
Copyright 2003–2008, Texas Instruments Incorporated
15
Product Folder Link(s): TPA3007D1
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相關代理商/技術參數 |
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| TPA3007D1PWR | 功能描述:音頻放大器 Mono Med Power 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 |
| TPA3007D1PWRG4 | 功能描述:音頻放大器 Mono Med Power 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 |
| TPA3008D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3008D2_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3008D2EVM | 功能描述:音頻 IC 開發工具 TPA3008D2 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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