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參數資料
| 型號： | TPA3121D2PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | AUDIO AMPLIFIER, PDSO24 |
| 封裝： | PLASTIC, HTSSOP-24 |
| 文件頁數： | 6/29頁 |
| 文件大小： | 860K |
| 代理商： | TPA3121D2PWPRG4 |
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INPUT CAPACITOR, Ci
f
=
c
1
2
Z C
p
i
–3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
Single-Ended Output Capacitor, CO
Output Filter and Frequency Response
SLOS537 – MAY 2008........................................................................................................................................................................................................ www.ti.com
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 impedance of the amplifier (Zi) form a
high-pass filter with the corner frequency determined in Equation 2.
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 2 is
reconfigured as Equation 3.
In this example, Ci is 0.4 F; so, one would likely choose a value of 0.47 F as this value is commonly used. If
the gain is known and is constant, use Zi from Table 2 to calculate Ci. 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 V, which is likely higher than the source dc level. Note that it is
important to confirm the capacitor polarity in the application. Additionally, lead-free solder can create dc offset
voltages, and it is important to ensure that boards are cleaned properly.
In single-ended (SE) applications, the dc blocking capacitor forms a high-pass filter with the speaker impedance.
The frequency response rolls of with decreasing frequency at a rate of 20 dB/decade. The cutoff frequency is
determined by
fc = 1/2πCOZL
Table 3 shows some common component values and the associated cutoff frequencies:
Table 3. Common Filter Responses
CSE - DC Blocking Capacitor (F)
Speaker Impedance (
)
fc = 60 Hz (–3 dB)
fc = 40 Hz (–3 dB)
fc = 20 Hz (–3 dB)
4
680
1000
2200
6
470
680
1500
8
330
470
1000
For the best frequency response, a flat-passband output filter (second-order Butterworth) may be used. The
output filter components consist of the series inductor and capacitor to ground at the LOUT and ROUT pins.
There are several possible configurations, depending on the speaker impedance and whether the output
configuration is single-ended (SE) or bridge-tied load (BTL). Table 4 lists the recommended values for the filter
components. It is important to use a high-quality capacitor in this application. A rating of at least X7R is required.
14
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPA3121D2
相關PDF資料 |
PDF描述 |
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| TPA3121D2PWP | AUDIO AMPLIFIER, PDSO24 |
| TPA3121D2PWPR | AUDIO AMPLIFIER, PDSO24 |
| TPA3122D2N | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20 |
| TPA3123D2PWPG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| TPA3123D2PWPRG4 | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA3122D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3122D2EVM | 功能描述:音頻 IC 開發工具 TPA3122D2EVM 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 |
| TPA3122D2N | 功能描述:音頻放大器 15W STEREO CLASS-D AUDIO POWER AMP 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 |
| TPA3123D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:25-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3123D2EVM | 功能描述:音頻 IC 開發工具 TPA3123D2EVM 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 |
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