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TPA032D01 Datasheet(PDF) 14 Page - Texas Instruments

No. de pieza TPA032D01
Descripción Electrónicos  10-W MONO CLASS-D AUDIO POWER AMPLIFIER
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPA032D01 Datasheet(HTML) 14 Page - Texas Instruments

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TPA032D01
10W MONO CLASSD AUDIO POWER AMPLIFIER
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 (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 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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