參數(shù)資料
型號(hào)： TPA6203A1DGNRG4
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, SOP-8
文件頁(yè)數(shù)： 5/29頁(yè)
文件大小： 952K
代理商： TPA6203A1DGNRG4
FULLY DIFFERENTIAL AMPLIFIER
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:
(6)
www.ti.com.......................................................................................................................................................... SLOS364F – MARCH 2002 – REVISED JUNE 2008
EFFICIENCY AND THERMAL INFORMATION
Class-AB amplifiers are inefficient. The primary cause
of these inefficiencies is voltage drop across the
output stage transistors. There are two components
of the internal voltage drop. One is the headroom or
dc voltage drop that varies inversely to output power.
The second component is due to the sinewave nature
of the output. The total voltage drop can be
calculated by subtracting the RMS value of the output
voltage from VDD. The internal voltage drop multiplied
by the average value of the supply current, IDD(avg),
determines the internal power dissipation of the
amplifier.
Figure 33. Voltage and Current Waveforms for
BTL Amplifiers
An easy-to-use equation to calculate efficiency starts
out as being equal to the ratio of power from the
power supply to the power delivered to the load. To
Although the voltages and currents for SE and BTL
accurately calculate the RMS and average values of
are sinusoidal in the load, currents from the supply
power in the load and in the amplifier, the current and
are
very
different
between
SE
and
BTL
voltage waveform shapes must first be understood
configurations. In an SE application the current
(see Figure 33).
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.
Copyright 2002–2008, Texas Instruments Incorporated
13
Product Folder Link(s): TPA6203A1
相關(guān)PDF資料
PDF描述
TPA6203A1GQV 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8
TPA6203AIDGN 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA6203AIDRB 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA6204A1DGN 1.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
TPA6205A1DGN 1.25 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA6203A1DRB 功能描述:音頻放大器 Mono Fully Diff Class-AB 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
TPA6203A1DRBG4 功能描述:音頻放大器 Mono Fully Diff Class-AB 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
TPA6203A1DRBR 功能描述:音頻放大器 Mono Fully Diff Class-AB 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
TPA6203A1DRBRG4 功能描述:音頻放大器 Mono Fully Diff Class-AB 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
TPA6203A1DRBTG4 制造商:Texas Instruments 功能描述:
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*