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參數(shù)資料
| 型號(hào)： | TPA005D14DCAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48 |
| 封裝： | PLASTIC, HTSSOP-48 |
| 文件頁數(shù)： | 13/30頁 |
| 文件大?。?/td> | 492K |
| 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 (VP) 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 + VL
I
L
Average I
DD +
I
L(rms)
V
L(rms)
V
DD
P
L +
V
L(rms)
2
R
L
+
V
P
2
2R
L
Average I
DD +
2
p
V
P
R
L
P
SUP +
V
DD
Average I
DD
P
SUP +
V
DD
Average I
DD +
V
DD VP
R
L
2
p
P
SUP +
V
DD
I
L(rms)
V
L(rms)
V
DD
Efficiency
+ h +
P
L
P
SUP
Efficiency
+ h +
P
L
P
SUP
Efficiency
+ h + V
DD
V
P
2
2R
L
2
p
V
P
R
L
Efficiency
+ h + 1
Efficiency
+ h + p
4
V
P
V
DD
In the ideal efficiency equations, assume that VP = VDD, 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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