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| 型号： | TPA6203A1GQV |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| 封装： | PLASTIC, BGA-8 |
| 文件页数： | 6/19页 |
| 文件大小： | 214K |
| 代理商： | TPA6203A1GQV |
TPA6203A1
SLOS364 – MARCH 2002
www.ti.com
14
V(LRMS)
VO
IDD
IDD(avg)
Figure 34. Voltage and Current Waveforms for BTL Amplifiers
Although the voltages and currents for SE and BTL are
sinusoidal in the load, currents from the supply are very
different between SE and BTL configurations. In an SE
application the current waveform is a half-wave rectified
shape, whereas in BTL it is a full-wave rectified waveform.
This means RMS conversion factors are different. Keep in
mind that for most of the waveform both the push and pull
transistors are not on at the same time, which supports the
fact that each amplifier in the BTL device only draws
current from the supply for half the waveform. The
following equations are the basis for calculating amplifier
efficiency.
Efficiency of a BTL amplifier
+
P
L
P
SUP
Where:
P
L +
V
L
rms2
R
L
, and V
LRMS +
V
P
2
, therefore, P
L +
V
P
2
2R
L
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
and PSUP + VDD IDDavg and IDDavg +
1
p
0
V
P
R
L
sin(t) dt
+ 1p
V
P
R
L
[cos(t)]
p
0 +
2V
P
p R
L
Therefore,
P
SUP +
2V
DD
V
P
p R
L
substituting PL and PSUP into equation 6,
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
R
L
Where:
h
BTL +
p 2P
L
R
L
4V
DD
Therefore,
(6)
(7)
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相关代理商/技术参数 |
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|---|---|
| TPA6203A1GQVR | 功能描述:音频放大器 Mono Fully Diff 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 |
| TPA6203A1ZQVR | 功能描述:音频放大器 Mono Fully Diff 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 |
| TPA6203A1ZQVRG1 | 功能描述:音频放大器 1.25W Mon,Fully Diff Class-AB Audio Amp 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 |
| TPA6204A1 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.7W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
| TPA6204A1_07 | 制造商:TI 制造商全称:Texas Instruments 功能描述:1.7W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER |
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