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參數資料
型號: TPA0211DGNRG4
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 2 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, MSOP-8
文件頁數: 3/27頁
文件大小: 770K
代理商: TPA0211DGNRG4
TPA0211
2-W MONO AUDIO POWER AMPLIFIER
SLOS275D – 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 10 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 0.4 F so one would likely choose a value in the range of 0.47 F 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.
相關PDF資料
PDF描述
TPA0212PWPG4 2.6 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24
TPA0212PWPR 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
TPA0212PWP 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
TPA0212PWPRG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
TPA0222PWPG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
相關代理商/技術參數
參數描述
TPA0211EVM 功能描述:音頻 IC 開發工具 TPA0211 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
TPA0212 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
TPA0212_07 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2.6-W AUDIO POWER AMPLIFIER WITH FOUR SELECTABLE GAIN SETTINGS AND MUX CONTROL
TPA0212EVM 功能描述:音頻 IC 開發工具 TPA0212 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
TPA0212PWP 功能描述:音頻放大器 2W Stereo A 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
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