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| 型號： | TPA321DGNR |
| 元件分類： | 音頻放大器 |
| 英文描述： | Single Audio Amplifier |
| 中文描述： | 單音頻放大器 |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 424K |
| 代理商： | TPA321DGNR |
TPA321
350-mW MONO AUDIO POWER AMPLIFIER
WITH DIFFERENTIAL INPUTS
SLOS312A – JUNE 2000 – REVISED JUNE 2000
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
bridge-tied load versus single-ended mode (continued)
f
c
1
2 R
L
C
C
(2)
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, eliminating 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 24. 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 a 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 25).
V(LRMS)
VO
IDD
IDD(RMS)
Figure 25. Voltage and Current Waveforms for BTL Amplifiers
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| TPA321DRG4 | 功能描述:音頻放大器 350-mW Low-Voltage w/diff inputs 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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| TPA3221DDV | 功能描述:HIGH POWER AMPLIFIER 制造商:texas instruments 系列:- 包裝:管件 零件狀態(tài):在售 類型:D 類 電壓 - 電源:7 V ~ 32 V 安裝類型:表面貼裝 工作溫度:0°C ~ 70°C 供應(yīng)商器件封裝:44-HTSSOP 封裝/外殼:44-TSSOP（0.240"，6.10mm 寬）裸露焊盤 標準包裝:35 |
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