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參數資料
| 型號： | TPA0312PWPRG4 |
| 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： | 18/36頁 |
| 文件大小： | 791K |
| 代理商： | TPA0312PWPRG4 |
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CREST FACTOR AND THERMAL CONSIDERATIONS
P
dB +
10Log
P
W
P
ref
+ 10Log
4 W
1 W
+ 6 dB
(9)
P
W
+ 10PdB 10
P
ref
+ 63 mW (18dB crest factor)
+ 125 mW (15dB crest factor)
+ 250 mW (9dB crest factor)
+ 500 mW (6dB crest factor)
+ 1000 mW (3dB crest factor)
+ 2000 mW (15dB crest factor)
(10)
TPA0312
SLOS335A – DECEMBER 2000 – REVISED OCTOBER 2004
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, VDD is in the denominator. This
indicates that as VDD goes down, efficiency goes up.
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 TPA0312 data sheet, one can see
that when the TPA0312 is operating from a 5-V supply into a 3-
speaker, 4-W peaks are available. Converting
watts to dB:
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)
Converting dB back into watts:
25
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA032D01 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:10-W MONO CLASS-D AUDIO POWER AMPLIFIER |
| TPA032D01DCA | 功能描述:音頻放大器 10W Monaur RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA032D01DCA | 制造商:Texas Instruments 功能描述:IC SM POWER AMP CLASS-D AUDIO |
| TPA032D01DCAR | 功能描述:音頻放大器 Class-D Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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