參數(shù)資料
型號： TPA6011A4PWP
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻控制
英文描述： 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
封裝： GREEN, PLASTIC, HTSSOP-24
文件頁數(shù)： 19/35頁
文件大?。?/td> 744K
代理商： TPA6011A4PWP
www.ti.com
V(LRMS)
VO
IDD
IDD(avg)
Efficiency of a BTL amplifier +
P
L
P
SUP
Where:
P
L +
V
Lrms
2
R
L
, and V
LRMS +
V
P
2
, therefore, P
L +
V
P
2
2R
L
and PSUP + VDD IDDavg
and
I
DDavg +
1
p
0
V
P
R
L
sin(t) dt
+
1
p
V
P
R
L
[cos(t)]
p
0 +
2V
P
p
R
L
Therefore,
P
SUP +
2 V
DD VP
p
R
L
(7)
Efficiency of a BTL amplifier +
V
P
2
2 R
L
2 V
DD VP
p
R
L
+
p
V
P
4 V
DD
PL = Power delivered to load
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
V
P +
2 P
L RL
hBTL +
p
2 P
L RL
4 V
DD
Where:
Therefore,
VP = Peak voltage on BTL load
IDDavg = Average current drawn from the power supply
VDD = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
(8)
TPA6011A4
SLOS392A – FEBRUARY 2002 – REVISED JULY 2004
Figure 38. 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.
substituting PL and PSUP into Equation 7,
Table 5 employs Equation 8 to calculate efficiencies for four different output power levels. Note that 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. Note that 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. For a stereo 1-W audio system with 8-
loads and a 5-V supply, the maximum draw
on the power supply is almost 3.25 W.
26
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA6011A4PWPG4 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA6011A4PWPR 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA6011A4PWPRG4 功能描述:音頻放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA6012A4 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL
TPA6012A4PWP 功能描述:音頻放大器 2W Stereo Audio Power Amp RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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