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參數(shù)資料
型號(hào)： TPA0312PWPG4
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(yè)數(shù)： 18/36頁(yè)
文件大小： 791K
代理商： TPA0312PWPG4
www.ti.com
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
相關(guān)PDF資料
PDF描述
TPA0312PWPRG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
TPA032D02DCAR 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48
TPA032D02DCA 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48
TPA032D02DCAG4 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48
TPA032D02DCARG4 10 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO48
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0312PWPR 功能描述:音頻放大器 St 2W Aud Pwr 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
TPA0312PWPRG4 功能描述:音頻放大器 St 2W Aud Pwr 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
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(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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