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参数资料
| 型号： | TPA0172PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频控制 |
| 英文描述： | 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO24 |
| 封装： | GREEN, PLASTIC, HTSSOP-24 |
| 文件页数： | 11/36页 |
| 文件大小： | 885K |
| 代理商： | TPA0172PWP |
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TPA0172
2W STEREO AUDIO POWER AMPLIFIER
WITH I2C BUS
SLOS327C AUGUST 2000 REVISED MAY 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
BTL amplifier efficiency (continued)
(8)
PL = Power delivered to load
PSUP = Power drawn from power supply
VLRMS = RMS voltage on BTL load
RL = Load resistance
VP = Peak voltage on BTL load
IDDavg = Average current drawn from the power supply
VDD = Power supply voltage
ηBTL = Efficiency of a BTL amplifier
Therefore,
P
SUP +
2V
DD VP
p R
L
substituting PL and PSUP into equation 7,
Efficiency of a BTL amplifier
+
V
P
2
2R
L
2V
DD VP
p R
L
+
p V
P
4V
DD
V
P +
2P
L RL
h
BTL +
p 2P
L RL
4V
DD
Where:
Therefore,
Table 2 employs equation 8 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
0.55
0.5
44.4
2.83
0.62
1
62.8
4
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 the utmost advantage when possible. Note that in equation 8, VDD is in the denominator.
This indicates that as VDD goes down, efficiency goes up.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPA0172PWPG4 | 功能描述:音频放大器 Stereo Class-AB 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 |
| TPA0172PWPR | 功能描述:音频放大器 Stereo Class-AB 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 |
| TPA0172PWPRG4 | 功能描述:音频放大器 Stereo Class-AB 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 |
| TPA02 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Power Operational Amplifier |
| TPA0202 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER |
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