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| 型號： | TPA0252PWPR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Toggle |
| 中文描述： | 放大器。其他 |
| 文件頁數(shù)： | 25/42頁 |
| 文件大小： | 806K |
| 代理商： | TPA0252PWPR |
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TPA0202
2-W STEREO AUDIO POWER AMPLIFIER
SLOS205B – FEBRUARY 1998 – REVISED DECEMBER 2000
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bridged-tied load versus single-ended mode (continued)
For example, a 68-
μ
F capacitor with an 8-
speaker would attenuate low frequencies below 293 Hz. The BTL
configuration cancels the dc offsets, which eliminates the need for the blocking capacitors. Low-frequency
performance is then limited only by the input network and speaker response. Cost and PCB space are also
minimized by eliminating the bulky coupling capacitor.
RL
CC
VO(PP)
VO(PP)
VDD
–3 dB
fc
Figure 60. Single-Ended Configuration and Frequency Response
Increasing power to the load does carry a penalty of increased internal power dissipation. The increased
dissipation is understandable considering that the BTL configuration produces 4
×
the output power of the SE
configuration. Internal dissipation versus output power is discussed further in the thermal considerations
section.
BTL amplifier efficiency
Linear amplifiers are notoriously inefficient. The primary cause of these inefficiencies is voltage drop across the
output stage transistors. There are two components of the internal voltage drop. One is the headroom or dc
voltage drop that varies inversely to output power. The second component is due to the sinewave nature of the
output. The total voltage drop can be calculated by subtracting the RMS value of the output voltage from V
DD
.
The internal voltage drop multiplied by the RMS value of the supply current, I
DD
rms, determines the internal
power dissipation of the amplifier.
An easy-to-use equation to calculate efficiency starts out as being equal to the ratio of power from the power
supply to the power delivered to the load. To accurately calculate the RMS values of power in the load and in
the amplifier, the current and voltage waveform shapes must first be understood (see Figure 61).
V(LRMS)
VO
IDD
IDD(RMS)
Figure 61. Voltage and Current Waveforms for BTL Amplifiers
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPA0253DGQR | AUDIO AMPLIFIER|SINGLE|CMOS|TSSOP|10PIN|PLASTIC |
| TPA2000D1PWR | Single Audio Amplifier |
| TPA2000D2PW | Amplifier. Other |
| TPA2000D2PWPR | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|24PIN|PLASTIC |
| TPA2000D2PWR | Switches, Microswitch; Circuitry:SPDT; Current Rating:1A; Features:Pin Plunger Actuator; Leaded Process Compatible:Yes; Mounting Type:Screw Terminal; Switch Function:SPDT |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TPA0253DGQ | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-AB AUDIO |
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