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參數(shù)資料
| 型號： | TPA0202PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Dual Audio Amplifier |
| 中文描述： | 雙音頻放大器 |
| 文件頁數(shù)： | 29/42頁 |
| 文件大?。?/td> | 806K |
| 代理商： | TPA0202PWPR |
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TPA0202
2-W STEREO AUDIO POWER AMPLIFIER
SLOS205B – FEBRUARY 1998 – REVISED DECEMBER 2000
29
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting resistors, R
F
and R
I
The gain for each audio input of the TPA0202 is set by resistors R
F
and R
I
according to equation 5 for BTL mode.
(5)
BTL Gain
2
RF
RI
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 TPA0202 is a MOS amplifier, the input impedance is very high,
consequently input leakage currents are not generally a concern although noise in the circuit increases as the
value of R
F
increases. In addition, a certain range of R
F
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.
(6)
Effective Impedance
R
F
R
I
R
F
R
I
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 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 R
F
above 50 k
the amplifier tends to become unstable due to a pole
formed from R
F
and the inherent input capacitance of the MOS input structure. For this reason, a small
compensation capacitor of approximately 5 pF should be placed in parallel with R
F
when R
F
is greater than
50 k
. This, in effect, creates a low pass filter network with the cutoff frequency defined in equation 7.
(7)
f
c(lowpass)
1
2 R
F
C
F
–3 dB
fc
For example, if R
F
is 100 k
and Cf is 5 pF then f
c
is 318 kHz, which is well outside of the audio range.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0202PWPRG4 | 功能描述:音頻放大器 2W St Aud Pwr Amp 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 |
| TPA0211 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER |
| TPA0211_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W MONO AUDIO POWER AMPLIFIER |
| TPA0211DGN | 功能描述:音頻放大器 2W Mono Audio 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 |
| TPA0211DGNG4 | 功能描述:音頻放大器 Mono Class-AB w/Mono Hdphone Drive 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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