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參數資料
| 型號： | TPA0312PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封裝： | GREEN, PLASTIC, HTSSOP-24 |
| 文件頁數： | 14/36頁 |
| 文件大小： | 791K |
| 代理商： | TPA0312PWPRG4 |
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OUTPUT COUPLING CAPACITOR, C
C
f
c(high) +
1
2 p R
L
C
3 dB
fc
(4)
USING LOW-ESR CAPACITORS
TPA0312
SLOS335A – DECEMBER 2000 – REVISED OCTOBER 2004
In the typical single-supply SE configuration, an output coupling capacitor (CC) is required to block the dc bias at
the output of the amplifier thus preventing dc currents in the load. As with the input coupling capacitor, the output
coupling capacitor and impedance of the load form a high-pass filter governed by Equation 4.
The main disadvantage, from a performance standpoint, is the load impedances are typically small, which drives
the low-frequency corner higher, degrading the bass response. Large values of CC are required to pass low
frequencies into the load. Consider the example where a CC of 330 F is chosen and loads vary from 3 , 4 ,
8
, 32 , 10 k, to 47 k. Table 2 summarizes the frequency response characteristics of each configuration.
Table 2. COMMON LOAD IMPEDANCES VS LOW FREQUENCY OUTPUT CHARACTERISTICS IN SE MODE
RL ()
CC (F)
LOWEST FREQUENCY( Hz)
3
330
161
4
330
120
8
330
60
32
330
15
10,000
330
0.05
47,000
330
0.01
As Table 2 indicates, most of the bass response is attenuated into a 4-
load, an 8- load is adequate,
headphone response is good, and drive into line level inputs (a home stereo, for example) is exceptional.
Low-ESR capacitors are recommended throughout this applications section. A real (as opposed to ideal)
capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this
resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this
resistance, the more the real capacitor behaves like an ideal capacitor.
21
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| TPA032D01DCAR | 功能描述:音頻放大器 Class-D Audio Power Amplifier 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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