參數(shù)資料
型號(hào)： TPA6030A4PWP
元件分類： 音頻放大器
英文描述： Slide
中文描述： 放大器。其他
文件頁(yè)數(shù)： 28/33頁(yè)
文件大?。?/td> 469K
代理商： TPA6030A4PWP
TPA6011A4
SLOS392
–
FEBRUARY 2002
28
www.ti.com
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
V(LRMS)
VO
IDD
IDD(avg)
Figure 37. Voltage and Current Waveforms for BTL Amplifiers
Although the voltages and currents for SE and BTL are sinusoidal in the load, currents from the supply are very
different between SE and BTL configurations. In an SE application the current waveform is a half-wave rectified
shape, whereas in BTL it is a full-wave rectified waveform. This means RMS conversion factors are different.
Keep in mind that for most of the waveform both the push and pull transistors are not on at the same time, which
supports the fact that each amplifier in the BTL device only draws current from the supply for half the waveform.
The following equations are the basis for calculating amplifier efficiency.
Efficiency of a BTL amplifier
P
L
P
SUP
(7)
Where:
(8)
P
L
V
L
rms
2
R
L
, andV
LRMS
V
P
2
, therefore, P
L
V
P
2R
L
2
P
L
= Power delivered to load
P
SUP
= Power drawn from power supply
V
LRMS
= RMS voltage on BTL load
R
L
= Load resistance
and P
SUP
V
DD
I
DD
avg
and
I
DD
avg
1
0
V
P
R
L
sin(t) dt
1
V
P
R
L
[
cos(t)
]
0
2V
P
R
L
Therefore,
P
SUP
2 V
DD
V
P
R
L
substituting P
L
and P
SUP
into equation 7,
Efficiency of a BTL amplifier
V
P
2 R
L
2
2 V
DD
V
P
R
L
V
P
4 V
DD
V
P
2 P
L
R
L
BTL
2 P
L
R
L
4 V
DD
Where:
Therefore,
V
P
= Peak voltage on BTL load
I
DD
avg = Average current drawn from the power supply
V
DD
= Power supply voltage
η
BTL
= Efficiency of a BTL amplifier
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