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參數(shù)資料
| 型號： | TPA0252PWPG4 |
| 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(shù)： | 13/34頁 |
| 文件大?。?/td> | 851K |
| 代理商： | TPA0252PWPG4 |
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USING LOW-ESR CAPACITORS
BRIDGED-TIED LOAD VS SINGLE-ENDED MODE
Power +
V
(rms)
2
R
L
V
(rms) +
V
O(PP)
2 2
(6)
RL
2x VO(PP)
VO(PP)
VDD
TPA0252
SLOS288B – JUNE 2000 – REVISED SEPTEMBER 2004
As Table 1 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.
Figure 36 shows a Class-AB audio power amplifier (APA) in a BTL configuration. The TPA0252 amplifier consists
of two Class-AB amplifiers driving both ends of the load. There are several potential benefits to this differential
drive configuration, but, initially consider power to the load. The differential drive to the speaker means that as
one side is slewing up, the other side is slewing down, and vice versa. This in effect doubles the voltage swing
on the load as compared to a ground referenced load. Substituting 2
× V
O(PP) into the power equation, where
voltage is squared, yields 4
× the output power from the same supply rail and load impedance (see Equation 6).
Figure 36. Bridge-Tied Load Configuration
In a typical computer sound channel operating at 5 V, bridging raises the power into an 8-
speaker from a
singled-ended (SE, ground reference) limit of 250 mW to 1 W. In sound power, this is a 6-dB improvement —
loudness that can be heard. In addition to increased power there are frequency-response concerns. Consider the
single-supply SE configuration shown in Figure 37. A coupling capacitor is required to block the dc offset voltage
from reaching the load. These capacitors can be quite large (approximately 33 F to 1000 F), so they tend to be
expensive, heavy, occupy valuable PCB area, and have the additional drawback of limiting the low-frequency
performance of the system. This frequency-limiting effect is due to the high-pass filter network created with the
speaker impedance and the coupling capacitance, and is calculated with Equation 7.
20
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| TPA0252PWPRG4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0252PWPR | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA0252PWPRG4 | 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA0253 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0253_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER WITH HEADPHONE DRIVE |
| TPA0253DGQ | 功能描述:音頻放大器 Mono Lo-Pwr Class-AB RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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