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參數資料
| 型號： | TPA3123D2PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO24 |
| 封裝： | GREEN, PLASTIC, TSSOP-24 |
| 文件頁數： | 5/30頁 |
| 文件大小： | 887K |
| 代理商： | TPA3123D2PWP |
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Ci
IN
Zi
Zf
Input
Signal
f=
1
2
Z C
p
i
www.ti.com
SLOS541C – JULY 2007 – REVISED AUGUST 2010
Several things can be done to relieve power-supply pumping. The lowest impact is to operate the two inputs out
of phase 180° and reverse the speaker connections. Because most audio is highly correlated, this causes the
supply pumping to be out of phase and not as severe. If this is not enough, the amount of bulk capacitance on
the supply must be increased. Also, improvement is realized by hooking other supplies to this node, thereby
sinking some of the excess current. Power supply pumping should be tested by operating the amplifier at low
frequencies and high output levels.
Gain Setting via GAIN0 and GAIN1 Inputs
The gain of the TPA3123D2 is set by two input terminals, GAIN0 and GAIN1.
The gains listed in Table 2 are realized by changing the taps on the input resistors and feedback resistors inside
the amplifier. This causes the input impedance (ZI) to be dependent on the gain setting. The actual gain settings
are controlled by ratios of resistors, so the gain variation from part-to-part is small. However, the input impedance
from part-to-part at the same gain may shift by ±20% due to shifts in the actual resistance of the input resistors.
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 TPA3123D2. At the higher gain
settings, the input impedance could increase as high as 72 k
.
Table 2. 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
INPUT RESISTANCE
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
cutoff frequency may change when changing gain steps.
(1)
Copyright 2007–2010, Texas Instruments Incorporated
13
Product Folder Link(s) :TPA3123D2
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| TPA3124D2PWPRG4 | AUDIO AMPLIFIER, PDSO24 |
| TPA3124D2PWPR | AUDIO AMPLIFIER, PDSO24 |
| TPA3124D2PWP | AUDIO AMPLIFIER, PDSO24 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| TPA3123D2PWPRG4 | 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 |
| TPA3124D2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA3124D2_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:15-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
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