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參數(shù)資料
| 型號： | TPA3004D2PHPG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PQFP48 |
| 封裝： | GREEN, PLASTIC, HTQFP-48 |
| 文件頁數(shù)： | 24/46頁 |
| 文件大小： | 838K |
| 代理商： | TPA3004D2PHPG4 |
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f
=
c
1
2pZ C
i
–3dB
f
c
C
i +
1
2pZ
i fc
SLOS407E – FEBRUARY 2003 – REVISED JANUARY 2011
www.ti.com
INPUT CAPACITOR, CI
In the typical application an input capacitor (CI) is required to allow the amplifier to bias the input signal to the
proper dc level (V2P5) 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 6.
(6)
The value of CI is important, as it directly affects the bass (low frequency) performance of the circuit. Consider
the example where ZI is 20 k and the specification calls for a flat bass response down to 20 Hz. Equation 6 is
reconfigured as Equation 7.
(7)
In this example, CI is 0.4 F, so one would likely choose a value in the range of 0.47 F to 1 F. If the gain is
known and will be constant, use ZI from Figure 7 (Input Impedance vs Gain) to calculate CI. Calculations for CI
should be based off the impedance at the lowest gain step intended for use in the system. A further
consideration for this capacitor is the leakage path from the input source through the input network (CI) 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.
Power Supply Decoupling, CS
The TPA3004D2 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 VCC 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 10-F capacitor also serves as local storage capacitor for supplying
current during large signal transients on the amplifier outputs.
BSN and BSP Capacitors
The full H-bridge output stages use only NMOS transistors. They therefore require bootstrap capacitors for the
high side of each output to turn on correctly. A 10-nF ceramic capacitor, rated for at least 25 V, must be
connected from each output to its corresponding bootstrap input. Specifically, one 10-nF capacitor must be
connected from xOUTP to xBSP, and one 10-nF capacitor must be connected from xOUTN to xBSN. (See the
application circuit diagram in Figure 35.)
The bootstrap capacitors connected between the BSxx pins and corresponding output function as a floating
power supply for the high-side N-channel power MOSFET gate drive circuitry. During each high-side switching
cycle, the bootstrap capacitors attempt to hold the gate-to-source voltage high enough to keep the high-side
MOSFETs turned on. However, there is a leakage path and the voltage on the bootstrap capacitors slowly
decrease while the high-side is conducting.
30
Copyright 2003–2011, Texas Instruments Incorporated
Product Folder Link(s): TPA3004D2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA3004D2PHPR | 功能描述:音頻放大器 Stereo Hi-Pwr Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3004D2PHPR | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC |
| TPA3004D2PHPRG4 | 功能描述:音頻放大器 Stereo Hi-Pwr Filter-Free Class-D RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA3005D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:6-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3005D2EVM | 功能描述:音頻 IC 開發(fā)工具 TPA3005D2 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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