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| 型號： | TPA0223DGQRG4 |
| 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, PDSO10 |
| 封裝： | GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 3/26頁 |
| 文件大小： | 716K |
| 代理商： | TPA0223DGQRG4 |
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TPA0223
2-W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS277C – JANUARY 2000 – REVISED NOVEMBER 2002
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
gain setting via input resistance
The gain of the input stage is set by the user-selected input resistor and a 50-k
internal feedback resistor.
However, the power stage is internally configured with a gain of –1.25 V/V in SE mode, and –2.5 V/V in BTL
mode. Thus, the feedback resistor (RF) is effectively 62.5 k in SE mode and 125 k in BTL mode. Therefore,
the overall gain can be calculated using equations (1) and (2).
(1)
A
V +
–125 k
W
R
I
(BTL)
(2)
A
V +
–62.5 k
W
R
I
(SE)
The –3 dB frequency can be calculated using equation 3:
(3)
–3dB +
1
2
p R
I
C
i
If the filter must be more accurate, the value of the capacitor should be increased while the value of the resistor
to ground should be decreased. In addition, the order of the filter could be increased.
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 for optimum operation. In this case, Ci and the input resistance of the amplifier, RI, form a
high-pass filter with the corner frequency determined in equation 4.
f
c(highpass) +
1
2
pR
I
C
i
–3 dB
fc
(4)
The value of Ci is important to consider as it directly affects the bass (low frequency) performance of the circuit.
Consider the example where RI is 710 k and the specification calls for a flat bass response down to 40 Hz.
Equation 2 is reconfigured as equation 5.
C
i +
1
2
pR
I
fc
(5)
In this example, CI is 5.6 nF so one would likely choose a value in the range of 5.6 nF to 1 F. 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 VDD/2, which is likely higher
than the source dc level. Note that it is important to confirm the capacitor polarity in the application.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0223EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0223 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 |
| TPA0232 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL |
| TPA0232EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0232 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 |
| TPA0232PWP | 功能描述:音頻放大器 2W Stereo 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 |
| TPA0232PWPG4 | 功能描述:音頻放大器 2W Stereo 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 |
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