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參數資料
| 型號： | TPA005D14 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | CONNECTOR ACCESSORY |
| 中文描述： | 連接器附件 |
| 文件頁數： | 20/29頁 |
| 文件大小： | 420K |
| 代理商： | TPA005D14 |
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TPA005D14
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS240A – AUGUST 1999 – REVISED MARCH 2000
20
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 24.
VDD
VOUT
L
CL
RL
IL
IOUT
+
–
VA
M2
M1
VDD
L
CL
M4
M3
Figure 24. H-Bridge Class-D Output Stage
相關PDF資料 |
PDF描述 |
|---|---|
| TPA005D14DCA | 2-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA005D12DCAR | Amplifier. Other |
| TPA005D14DCAR | Amplifier. Other |
| TPA0112PWPR | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|24PIN|PLASTIC |
| TPA0132PWPR | AUDIO AMPLIFIER|DUAL|CMOS|TSSOP|24PIN|PLASTIC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA005D14DCA | 功能描述:音頻放大器 2W Stereo P 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 |
| TPA005D14DCAR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Amplifier. Other |
| TPA00NBNF10 | 制造商:GREATECS 制造商全稱:GREATECS 功能描述:SPST SMT Tactile Switches with LED |
| TPA00NBNG10 | 制造商:GREATECS 制造商全稱:GREATECS 功能描述:SPST SMT Tactile Switches with LED |
| TPA00NBRB10 | 制造商:GREATECS 制造商全稱:GREATECS 功能描述:SPST SMT Tactile Switches with LED |
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