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| 型號： | TPA6204A1DGN |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | R-78Bxx-1.0(L) Series - Innoline Regulated DC-DC Converters; Output Voltage (Vdc): 5.0V; Output Current (A): 1.0A; Features: Efficiency up to 97%,Non isolated, no need for heatsinks; Pin-out compatible with LM78XX Linears; Low profile( L*W*H=11.5*8.5*17.5mm); Wide input range.(4.75V ~ 34V); Short circuit protection, Thermal shutdown; Non standard outputs available as specialsbetween 1.5V ~15V; Low ripple and noise; ?L? version with 90?? pins |
| 中文描述： | 1.7W單聲道全差分音頻功率放大器 |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 244K |
| 代理商： | TPA6204A1DGN |
SLOS429 MAY 2004
www.ti.com
11
FULLY DIFFERENTIAL AMPLIFIER
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 V
DD
. The internal voltage
drop multiplied by the average value of the supply current,
I
DD
(avg), determines the internal power dissipation of the
amplifier.
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 accurately calculate
the RMS and average values of power in the load and in
the amplifier, the current and voltage waveform shapes
must first be understood (see Figure 18).
V(LRMS)
VO
IDD
IDD(avg)
Figure 18. 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
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
PL
PSUP
Where:
PL
VLrms
2
RL
, andVLRMS
VP
2
, therefore, PL
VP
2RL
2
P
L
= Power delivered to load
P
SUP
= Power drawn from power supply
V
LRMS
= RMS voltage on BTL load
R
L
= Load resistance
V
P
= Peak voltage on BTL load
I
DD
avg = Average current drawn from the
power supply
V
DD
= Power supply voltage
η
BTL
= Efficiency of a BTL amplifier
and
PSUP
VDDIDDavg
and
IDDavg
1
0
VP
RL
sin(t) dt
1
VP
RL
[
cos(t)
]
0
2VP
RL
Therefore,
PSUP
2 VDDVP
RL
substituting P
L
and P
SUP
into equation 6,
Efficiency of a BTL amplifier
V
P
2 R
L
2
2 V
DD
V
P
R
L
V
P
4 V
DD
VP
2 PLRL
Where:
BTL
2 PLR
L
4 VDD
Therefore,
(4)
(5)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA6204A1DRB | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRB | 制造商:Texas Instruments 功能描述:AUDIO POWER AMPLIFIER IC 制造商:Texas Instruments 功能描述:IC, AUDIO PWR AMP, CLASS AB, 1.7W, SON-8 |
| TPA6204A1DRBG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRBR | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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 |
| TPA6204A1DRBRG4 | 功能描述:音頻放大器 1.7-W Mono Full Diff Aud Power Amplifier 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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