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| 型号： | TPA721DRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 6/26页 |
| 文件大小： | 663K |
| 代理商： | TPA721DRG4 |
www.ti.com
I
DD(RMS) +
2V
P
p
R
L
P
SUP + VDD
I
DD(RMS) +
V
DD 2VP
p
R
L
Efficiency +
P
L
P
SUP
where
P
L +
V
L(RMS)
2
R
L
+
Vp
2
2R
L
V
L(RMS) +
V
P
2
(3)
Efficiency of a BTL configuration
+
p
V
P
4V
DD
+
p
2 P
LRL
1 2
4V
DD
(4)
TPA721
SLOS231E – NOVEMBER 1998 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Table 1 employs Equation 4 to calculate efficiencies for three different output power levels. 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. 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.
Table 1. Efficiency vs Output Power in 3.3-V, 8-
BTL Systems
INTERNAL
OUTPUT POWER
EFFICIENCY
PEAK VOLTAGE
DISSIPATION
(W)
(%)
(V)
(W)
0.125
33.6
1.41
0.26
0.25
47.6
2.00
0.29
0.375
58.3
2.45(1)
0.28
(1)
High-peak voltage values cause the THD to increase.
A final point to remember about linear amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. In Equation 4, VDD is in the denominator. This indicates
that as VDD goes down, efficiency goes up.
14
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相关代理商/技术参数 |
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| TPA721EVM | 制造商:TI 制造商全称:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER |
| TPA721MSOPEVM | 功能描述:音频 IC 开发工具 TPA721MSOP 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 |
| TPA731 | 制造商:TI 制造商全称:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS |
| TPA731_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:700-mW MONO LOW-VOLTAGE AUDIO POWER AMPLIFIER WITH DIFFERENTIAL INPUTS |
| TPA731D | 功能描述:音频放大器 700mW Low V 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 |
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