參數(shù)資料
型號(hào)： TPA0172PWPG4
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)： 13/36頁(yè)
文件大?。?/td> 885K
代理商： TPA0172PWPG4
TPA0172
2W STEREO AUDIO POWER AMPLIFIER
WITH I2C BUS
SLOS327C AUGUST 2000 REVISED MAY 2001
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
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. When the TPA0172 is operating from a 5-V
supply into a 3-
speaker, 4-W peaks are available. To convert watts to dB use equation 9.
P
dB + 10 Log
P
W
P
ref
+ 10Log 4W
1W
+ 6dB
(9)
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)
To convert dB back to watts use equation 10.
P
W + 10
PdB 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)
(10)
+ 2000 mW (3-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, 3-
system, the internal dissipation in the TPA0172 and
maximum ambient temperatures are shown in Table 3.
Table 3. TPA0172 Power Rating, 5-V, 3-
Stereo
PEAK OUTPUT POWER
(W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W/Channel)
MAXIMUM AMBIENT
TEMPERATURE
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
96
°C
相關(guān)PDF資料
PDF描述
TPA0172PWPRG4 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0172PWPR 功能描述:音頻放大器 Stereo 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
TPA0172PWPRG4 功能描述:音頻放大器 Stereo 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
TPA02 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Operational Amplifier
TPA0202 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER
TPA0202PWP 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
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