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參數資料
| 型號： | TPA3122D2N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 15 W, 2 CHANNEL, AUDIO AMPLIFIER, PDIP20 |
| 封裝： | PLASTIC, DIP-20 |
| 文件頁數： | 3/21頁 |
| 文件大小： | 507K |
| 代理商： | TPA3122D2N |
www.ti.com
INPUT RESISTANCE
Ci
IN
Zi
Zf
Input
Signal
f=
1
2
Z C
p
i
(1)
INPUT CAPACITOR, CI
f
=
c
1
2
Z C
p
i
–3dB
fc
(2)
C =
i
1
2
Z f
p
i
c
(3)
SLOS527A – DECEMBER 2007 – REVISED DECEMBER 2007
For design purposes, the input network (discussed in the next section) should be designed assuming an input
impedance of 8 k
, which is the absolute minimum input impedance of the TPA3122D2. At the higher gain
settings, the input impedance could increase as high as 72 k
Table 1. Gain Setting
AMPLIFIER GAIN (dB)
INPUT IMPEDANCE (k
)
GAIN1
GAIN0
TYPICAL
0
20
60
0
1
26
30
1
0
32
15
1
36
9
Changing the gain setting can vary the input resistance of the amplifier from its smallest value, 10 k
±20%, to
the largest value, 60 k
±20%. As a result, if a single capacitor is used in the input high-pass filter, the -3 dB or
cutoff frequency may change when changing gain steps.
In the typical application, an input capacitor
I) 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 1 to calculate CI. A further consideration for this capacitor is
the leakage path from the input source through the input network
I) 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
Copyright 2007, Texas Instruments Incorporated
11
Product Folder Link(s) :TPA3122D2
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| 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 |
| TPA3123D2PWP | 功能描述:音頻放大器 25W St Class-D Aud Pwr 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 |
| TPA3123D2PWPG4 | 功能描述:音頻放大器 25W Stereo Class D Aud Pwr 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 |
| TPA3123D2PWPR | 功能描述:音頻放大器 25W St Class-D Aud Pwr 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 |
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