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)： 29/33頁(yè)
文件大?。?/td> 469K
代理商： TPA6030A4PWP
TPA6011A4
SLOS392
–
FEBRUARY 2002
29
www.ti.com
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
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.
Table 5. Efficiency vs Output Power in 5-V, 8-
BTL Systems
Output Power
(W)
Efficiency
(%)
Peak Voltage
(V)
Internal Dissipation
(W)
0.25
31.4
2.00
0.55
0.50
44.4
2.83
0.62
1.00
62.8
4.00
4.47
0.59
1.25
70.2
0.53
High peak voltages cause the THD to increase.
A final point to remember about Class-AB amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. Note that in equation 8, V
DD
is in the denominator. This
indicates that as V
DD
goes down, efficiency goes up.
crest factor and thermal considerations
Class-AB power amplifiers dissipate a significant amount of heat in the package under normal operating
conditions. A typical music CD requires 12 dB to 15 dB of dynamic range, or headroom above the average power
output, to pass the loudest portions of the signal without distortion. In other words, music typically has a crest
factor between 12 dB and 15 dB. When determining the optimal ambient operating temperature, the internal
dissipated power at the average output power level must be used. From the TPA6011A4 data sheet, one can
see that when the TPA6011A4 is operating from a 5-V supply into a 3-
speaker, that 4-W peaks are available.
Use equation 9 to convert watts to dB.
P
dB
10Log
P
W
P
ref
10Log4 W
1 W
6 dB
(9)
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
6 dB
–
15 dB =
–
9 dB (15-dB crest factor)
6 dB
–
12 dB =
–
6 dB (12-dB crest factor)
6 dB
–
9 dB =
–
3 dB (9-dB crest factor)
6 dB
–
6 dB = 0 dB (6-dB crest factor)
6 dB
–
3 dB = 3 dB (3-dB crest factor)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA6030A4PWPG4 功能描述:音頻放大器 Wide Supply Voltage Low Power Class-AB 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
TPA6030A4PWPR 功能描述:音頻放大器 Wide Supply Voltage Low Power Class-AB 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
TPA6030A4PWPRG4 功能描述:音頻放大器 Wide Supply Voltage Low Power Class-AB 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
TPA6040A4 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DirectPath STEREO HEADPHONE DRIVE AND REGULATOR
TPA6040A4EVM 功能描述:音頻 IC 開發(fā)工具 TPA6040A4 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
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