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參數(shù)資料
| 型號(hào)： | TPA032D01DCAR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| 中文描述： | 10單聲道D類音頻功率放大器 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 550K |
| 代理商： | TPA032D01DCAR |
SLOS282B DECEMBER 1999 REVISED JUNE 2000
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
the ideal class-D amplifier (continued)
Given these plots, the efficiency of the class-D device can be calculated and compared to an ideal linear
amplifier device. In the derivation below, a sine wave of peak voltage (V
P
) is the output from an ideal class-D
and linear amplifier and the efficiency is calculated.
V
L(rms)
V
P
2
CLASS-D
LINEAR
V
L(rms)
V
P
2
P
L
V
L
I
L
Average I
DD
I
L(rms)
V
L(rms)
V
DD
P
L
V
L(rms)
R
L
2
V
P
2
2 R
L
Average I
DD
2
V
P
R
L
P
SUP
V
DD
Average I
DD
P
SUP
V
DD
Average I
DD
V
DD
V
P
R
L
2
P
SUP
V
DD
I
L(rms)
V
DD
V
L(rms)
Efficiency
P
L
P
SUP
Efficiency
P
L
P
SUP
Efficiency
V
DD
V
P2
2R
L
2
V
P
R
L
Efficiency
1
Efficiency
4
VP
VDD
In the ideal efficiency equations, assume that V
P
= V
DD
, which is the maximum sine wave magnitude without
clipping. Then, the highest efficiency that a linear amplifier can have without clipping is 78.5%. A class-D
amplifier, however, can ideally have an efficiency of 100% at all power levels.
The derivation above applies to an H-bridge as well as a half-bridge. An H-bridge requires approximately twice
the supply current but only requires half the supply voltage to achieve the same output power—factors that
cancel in the efficiency calculation. The H-bridge circuit is shown in Figure 7.
VDD
VOUT
L
CL
RL
IL
IOUT
+
VA
M2
M1
VDD
L
CL
M4
M3
Figure 7. H-Bridge Class-D Output Stage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA032D01DCARG4 | 功能描述:音頻放大器 Class-D Audio Power Amp 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 |
| TPA032D01EVM | 制造商:Texas Instruments 功能描述:MONO CLASS-D AUDIO POWER AMPLIFIER EVM - Bulk |
| TPA032D02 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D02_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D02DCA | 功能描述:音頻放大器 10W Class-D 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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