參數(shù)資料
型號： TPA321DGN
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝： GREEN, PLASTIC, MSOP-8
文件頁數(shù)： 9/29頁
文件大小： 773K
代理商： TPA321DGN
www.ti.com
COMPONENT SELECTION
Gain Setting Resistors, RF and RI
BTL Gain + AV + * 2
R
F
R
I
(5)
Effective Impedance +
R
F
R
I
R
F )
R
I
(6)
3 dB
fc
fc +
1
2p R
F
C
F
(7)
Input Capacitor, CI
TPA321
SLOS312C – JUNE 2000 – REVISED JUNE 2004
The gain for each audio input of the TPA321 is set by resistors RF and RI according to Equation 5 for BTL mode.
BTL mode operation brings about the factor 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA321 is a MOS amplifier, the input impedance is high;
consequently, input leakage currents are not generally a concern, although noise in the circuit increases as the
value of RF increases. In addition, a certain range of RF values is required for proper start-up operation of the
amplifier. Taken together, it is recommended that the effective impedance seen by the inverting node of the
amplifier be set between 5 k
and 20 k. The effective impedance is calculated in Equation 6.
As an example, consider an input resistance of 10 k
and a feedback resistor of 50 k. The BTL gain of the
amplifier would be –10 V/V, and the effective impedance at the inverting terminal would be 8.3 k
, which is well
within the recommended range.
For high-performance applications metal film resistors are recommended because they tend to have lower noise
levels than carbon resistors. For values of RF above 50 k, the amplifier tends to become unstable due to a pole
formed from RF and the inherent input capacitance of the MOS input structure. For this reason, place a small
compensation capacitor (CF) of approximately 5 pF in parallel with RF when RF is greater than 50 k. In effect,
this creates a low-pass filter network with the cutoff frequency defined in Equation 7.
For example, if RF is 100 k and CF is 5 pF then fc is 318 kHz, which is well outside of audio range.
In the typical application, input capacitor CI is required to allow the amplifier to bias the input signal to the proper
dc level for optimum operation. In this case, CI and RI form a high-pass filter with the corner frequency
determined in Equation 8.
17
相關(guān)PDF資料
PDF描述
TPA321DR 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321D 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DRG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA321DGNRG4 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA321DGNG4 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA321DGNR 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA321DGNRG4 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA321DR 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA321DRG4 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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