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參數(shù)資料
| 型號(hào)： | TPA6017A2PWPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.9 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁(yè)數(shù)： | 15/29頁(yè) |
| 文件大小： | 575K |
| 代理商： | TPA6017A2PWPRG4 |
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TPA6017A2
SLOS386A NOVEMBER 2001 REVISED APRIL 2007
22
www.ti.com
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
Table 2. 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
0.59
1.25
70.2
4.47
0.53
High peak voltages cause the THD to increase.
A final point to remember about Class-AB amplifiers is how to manipulate the terms in the efficiency equation
to utmost advantage when possible. Note that in equation 6, VDD is in the denominator. This indicates that as
VDD 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 TPA6017A2 data sheet, one can
see that when the TPA6017A2 is operating from a 5-V supply into a 3-
speaker 4-W peaks are available.
Converting watts to dB:
P
dB +
10 Log
P
W
P
ref
+ 10Log 4W
1W
+ 6dB
(7)
Subtracting the headroom restriction to obtain the average listening level without distortion yields:
6 dB 18 dB = 12 dB (18 dB crest factor)
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)
Converting dB back into watts:
P
W +
10PdB 10
P
ref
+ 63 mW (18 dB crest factor)
+ 125 mW (15 dB crest factor)
+ 250 mW (12 dB crest factor)
+ 500 mW (9 dB crest factor)
+ 1000 mW (6 dB crest factor)
(8)
+ 2000 mW (3 dB crest factor)
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相關(guān)代理商/技術(shù)參數(shù) |
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| TPA6019A4PWPR | 制造商:Texas Instruments 功能描述:AUDIO AMP 制造商:TI 功能描述:STEREO BTL 1W AUDIO POWER AMPLIFIER |
| TPA6020A2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.8-W STEREO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6020A2EVM | 功能描述:音頻 IC 開(kāi)發(fā)工具 TPA6020A2 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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| TPA6020A2RGWR | 功能描述:音頻放大器 Stereo Fully Diff 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 |
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