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参数资料
| 型号： | TPA0233DGQ |
| 厂商： | Texas Instruments |
| 文件页数： | 9/26页 |
| 文件大小： | 0K |
| 描述： | IC AMP AUDIO PWR 2W MONO 10MSOP |
| 标准包装： | 80 |
| 类型： | AB 类 |
| 输出类型： | 1-通道（单声道），带立体声耳机 |
| 在某负载时最大输出功率 x 通道数量： | 2W x 1 @ 4 欧姆; 92mW x 2 @ 32 欧姆 |
| 电源电压： | 2.5 V ~ 5.5 V |
| 特点： | 消除爆音；关闭 |
| 安装类型： | 表面贴装 |
| 供应商设备封装： | 10-MSOP-PowerPad |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 配用： | 296-10813-ND - EVAL MOD AUDIO AMP FOR TPA0233 |
| 其它名称： | 296-34549-5 TPA0233DGQ-ND |
TPA0233
2W MONO AUDIO POWER AMPLIFIER
WITH HEADPHONE DRIVE
SLOS278D JANUARY 2000 REVISED NOVEMBER 2002
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
(10)
PL = Power devilered to load
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
h
BTL +
p 2P
L RL
4V
DD
therefore,
VP = Peak voltage on BTL load
IDDavg = Average current drawn from the power supply
VDD = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
Table 2 employs equation 10 to calculate efficiencies for four different output power levels. Note that the
efficiency of the amplifier is quite low for lower power levels and rises sharply as power to the load is increased,
resulting in a nearly flat internal power dissipation over the normal operating range. Note that the internal
dissipation at full output power is less than in the half power range. Calculating the efficiency for a specific
system is the key to proper power supply design. For a stereo 1-W audio system with 8-
loads and a 5-V supply,
the maximum draw on the power supply is almost 3.25 W.
Table 2. Efficiency vs Output Power in 5-V, 8-
BTL Systems
Output Power
(W)
Efficiency
(%)
Peak Voltage
(V)
Internal Dissipation
(W)
0.25
31.4
2.00
0.55
0.50
44.4
2.83
0.62
1.00
62.8
4.00
0.59
1.25
70.2
4.47
0.53
High peak voltages cause the THD to increase.
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 TPA0233 data sheet shows that when
the TPA0233 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)
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| TPA0233DGQG4 | 功能描述:音频放大器 Mono Class-AB w/Ster Hdphn Drv Summed Inp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0233DGQR | 功能描述:音频放大器 Mono Class-AB w/Ster Hdphn Drv Summed Inp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0233DGQRG4 | 功能描述:音频放大器 Mono Class-AB w/Ster Hdphn Drv Summed Inp RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA0233EVM | 功能描述:音频 IC 开发工具 TPA0233 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA0233G | 制造商:ON Semiconductor 功能描述:THY T0220 SPECIAL SCR |
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