參數(shù)資料
型號(hào)： TPA751DR
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)： 14/22頁(yè)
文件大小： 336K
代理商： TPA751DR
TPA721
700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER
SLOS231D
–
NOVEMBER 1998
–
REVISED OCTOBER 2002
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
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.
I
DD
rms
2V
P
R
L
P
SUP
VDDI
DD
rms
V
DD
2V
P
R
L
Efficiency
PL
PSUP
Efficiency of a BTL configuration
V
P
4V
DD
2 P
L
R
L
4V
DD
1 2
(3)
where
(4)
PL
VLrms2
RL
V
P
2
Vp
2RL
2
V
L
rms
Table 1 employs equation 4 to calculate efficiencies for three different output power levels. The efficiency of the
amplifier is quite low for lower power levels and rises sharply as power to the load is increased, resulting in a
nearly flat internal power dissipation over the normal operating range. The internal dissipation at full output
power is less than in the half power range. Calculating the efficiency for a specific system is the key to proper
power supply design.
Table 1. Efficiency vs Output Power in 3.3-V 8-
BTL Systems
OUTPUT POWER
(W)
EFFICIENCY
(%)
PEAK VOLTAGE
(V)
INTERNAL
DISSIPATION
(W)
0.125
33.6
1.41
0.26
0.25
47.6
2.00
2.45
0.29
0.375
58.3
0.28
High-peak voltage values cause the THD to increase.
A final point to remember about linear amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. In equation 4, V
DD
is in the denominator. This indicates
that as V
DD
goes down, efficiency goes up.
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