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參數(shù)資料
| 型號： | TPA0112PWPRG4 |
| 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(shù)： | 19/34頁 |
| 文件大?。?/td> | 655K |
| 代理商： | TPA0112PWPRG4 |
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CREST FACTOR AND THERMAL CONDITIONS
P
dB + 10 Log
P
W
P
ref
+ 10 Log
4 W
1 W
+ 6 dB
(9)
P
W + 10
PdB 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)
TPA0112
SLOS204C – MAY 1999 – REVISED SEPTEMBER 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 TPA0112 data sheet, one can see
that when the TPA0112 is operating from a 5-V supply into a 3-
speaker that 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:
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, 3-
system, the internal dissipation in the TPA0112 and
maximum ambient temperatures is shown in Table 4.
Table 4. TPA0112 POWER RATING, 5-V, 3-
, STEREO
PEAK OUTPUT POWER
POWER DISSIPATION
MAXIMUM AMBIENT
AVERAGE OUTPUT POWER
(W)
(W/Channel)
TEMPERATURE(1)
4
2 W (3 dB)
1.7
–3
°C
4
1000 mW (6 dB)
1.6
6
°C
4
500 mW (9 dB)
1.4
24
°C
4
250 mW (12 dB)
1.1
51
°C
4
125 mW (15 dB)
0.8
78
°C
4
63 mW (18 dB)
0.6
85
°C
(1)
Package limited to85
°C ambient.
26
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| TPA0122EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0122 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| TPA0122PWP | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0122PWPG4 | 功能描述:音頻放大器 2W Stereo A 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 |
| TPA0122PWPR | 功能描述:音頻放大器 2W Stereo APA With Int Gain Settings 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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