- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98268 > TPA0223DGQ (TEXAS INSTRUMENTS INC) 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 PDF資料下載
參數(shù)資料
| 型號： | TPA0223DGQ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 646K |
| 代理商： | TPA0223DGQ |
TPA0223
2-W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS277C – JANUARY 2000 – REVISED NOVEMBER 2002
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
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 10, VDD is in the denominator.
This indicates that as VDD goes down, efficiency goes up.
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. The TPA0223 data sheet shows that when
the TPA0223 is operating from a 5-V supply into a 4-
speaker 4-W peaks are available. Converting watts to
dB:
P
dB +
10 Log
P
W
P
ref
+ 10Log 4W
1W
+ 6dB
(11)
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:
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)
(12)
+ 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. Table 3 shows maximum ambient temperatures and TPA223 internal power dissipation for various
output-power levels.
Table 3. TPA0223 Power Rating, 5-V, 3-
, Mono
PEAK OUTPUT POWER
(W)
AVERAGE OUTPUT POWER
POWER DISSIPATION
(W)
MAXIMUM AMBIENT
TEMPERATURE
4
2 W (3-dB crest factor)
1.7
– 3
°C
4
1000 mW (6-dB crest factor)
1.6
6
°C
4
500 mW (9-dB crest factor)
1.4
24
°C
4
250 mW (12-dB crest factor)
1.1
51
°C
4
125 mW (15-dB crest factor)
0.8
78
°C
4
63 mW (18-dB crest factor)
0.6
96
°C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPA0232PWP | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| TPA0232PWPR | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| TPA0232PWPG4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| TPA0232PWPRG4 | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| TPA0233DGQR | 2 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO10 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA0223DGQG4 | 功能描述:音頻放大器 2W Mono 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 |
| TPA0223DGQR | 功能描述:音頻放大器 2W Mono 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 |
| TPA0223DGQRG4 | 功能描述:音頻放大器 2W Mono 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 |
| TPA0223EVM | 功能描述:音頻 IC 開發(fā)工具 TPA0223 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 |
| TPA0232 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:STEREO 2-W AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL AND MUX CONTROL |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。