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參數(shù)資料
| 型號： | TPA6205A1DGNRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大小： | 912K |
| 代理商： | TPA6205A1DGNRG4 |
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V(LRMS)
VO
IDD
IDD(avg)
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
+ *
1
p
V
P
R
L
[cos(t)]
p
0 +
2V
P
p
R
L
Therefore,
P
SUP +
2 V
DD
V
P
p
R
L
substituting PL and PSUP into equation 6,
Efficiency of a BTL amplifier +
V
P
2
2 R
L
2 V
DD VP
p
R
L
+
p
V
P
4 V
DD
V
P +
2 P
L
R
L
where:
(10)
SLOS490B – JULY 2006 – REVISED JUNE 2008 ..............................................................................................................................................................
www.ti.com
An easy-to-use equation to calculate efficiency starts
Although the voltages and currents for SE and BTL
out as being equal to the ratio of power from the
are sinusoidal in the load, currents from the supply
power supply to the power delivered to the load. To
are
very
different
between
SE
and
BTL
accurately calculate the RMS and average values of
configurations. In an SE application the current
power in the load and in the amplifier, the current and
waveform is a half-wave rectified shape, whereas in
voltage waveform shapes must first be understood
BTL it is a full-wave rectified waveform. This means
(see Figure 34).
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.
Figure 34. Voltage and Current Waveforms for
BTL Amplifiers
14
Copyright 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA6205A1
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|---|---|
| TPA6205A1DRB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.25-W MONO FULLY DIFFERENTIAL AUDIO POWER AMPLIFIER WITH 1.8-V INPUT LOGIC THRESHOLDS |
| TPA6205A1DRBR | 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud 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 |
| TPA6205A1DRBRG4 | 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud 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 |
| TPA6205A1DRBT | 功能描述:音頻放大器 1.25-W Mono Fully Diff Class-AB Aud 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 |
| TPA6205A1DRBTG4 | 功能描述:音頻放大器 1.25W Mono Fully Diff ClassAB Aud 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 |
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