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參數資料
| 型號： | TPA005D12DCAR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 音頻放大器 |
| 英文描述： | Amplifier. Other |
| 中文描述： | 放大器。其他 |
| 文件頁數： | 25/29頁 |
| 文件大小： | 420K |
| 代理商： | TPA005D12DCAR |
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TPA005D14
2-W STEREO CLASS-D AUDIO POWER AMPLIFIER
SLOS240A – AUGUST 1999 – REVISED MARCH 2000
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
crest factor and thermal considerations
A typical music CD requires 12 dB to 15 dB of dynamic headroom to pass the loudest portions without distortion
as compared with the average power output. From the TPA005D14 data sheet, one can see that when the
TPA005D14 is operating from a 5-V supply into a 4-
speaker that 4 W peaks are available. Converting Watts
to dB:
P
dB
10Log
P
W
P
ref
10Log
4
1
6 dB
(3)
Subtracting the crest factor restriction to obtain the average listening level without distortion yields:
6.0 dB
6.0 dB
6.0 dB
6.0 dB
6.0 dB
15 dB
12 dB
9 dB
6 dB
3 dB
9 dB (15 dB crest factor)
6 dB (12 dB crest factor)
3 dB (9 dB crest factor)
0 dB (6 dB crest factor)
3 dB (3 dB crest factor)
6.0 dB
18 dB
12 dB (15 dB crest factor)
Converting dB back into watts:
P
W
10
PdB 10
P
ref
125 mW (15 dB crest factor)
250 mW (12 dB crest factor)
500 mW (9 dB crest factor)
1000 mW (6 dB crest factor)
2000 mW (3 dB crest factor)
(4)
63 mW (18 dB crest factor)
This is valuable information to consider when attempting to estimate the heat dissipation requirements for the
amplifier system. Comparing the absolute worst case, which is 2 W of continuous power output with a 3 dB crest
factor, against 12 dB and 15 dB applications drastically affects maximum ambient temperature ratings for the
system. Using the power dissipation curves for a 5-V, 4-
system, the internal dissipation in the TPA005D14
and maximum ambient temperatures is shown in Table 3.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA005D14 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO CLASS-D AUDIO POWER AMPLIFIER |
| TPA005D14DCA | 功能描述:音頻放大器 2W Stereo P 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 |
| TPA005D14DCAR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Amplifier. Other |
| TPA00NBNF10 | 制造商:GREATECS 制造商全稱:GREATECS 功能描述:SPST SMT Tactile Switches with LED |
| TPA00NBNG10 | 制造商:GREATECS 制造商全稱:GREATECS 功能描述:SPST SMT Tactile Switches with LED |
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