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| 型號(hào)： | TPA005D14DCAR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類(lèi)： | 音頻放大器 |
| 英文描述： | Amplifier. Other |
| 中文描述： | 放大器。其他 |
| 文件頁(yè)數(shù)： | 20/29頁(yè) |
| 文件大小： | 420K |
| 代理商： | TPA005D14DCAR |
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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
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