參數(shù)資料
型號： TPA0122PWP
廠商： Texas Instruments, Inc.
元件分類： 音頻放大器
英文描述： CONNECTOR ACCESSORY
中文描述： 連接器附件
文件頁數(shù)： 27/34頁
文件大?。?/td> 534K
代理商： TPA0122PWP
TPA0122
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS247B – JUNE 1999 – REVISED MARCH 2000
27
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Efficiency of a BTL amplifier
P
L
P
SUP
(7)
Where:
(8)
P
L
V
L
rms
2
R
L
, andV
LRMS
V
P
2
, therefore, P
L
V
P
2R
L
2
P
L
= Power devilered 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
P
SUP
V
DD
I
DD
avg
and
I
DD
avg
1
0
V
P
R
L
sin(t) dt
1
V
P
R
L
[
cos(t)
]
0
2V
P
R
L
Therefore,
P
SUP
2 V
DD
V
P
R
L
substituting P
L
and P
SUP
into equation 7,
Efficiency of a BTL amplifier
V
P
2 R
L
2
2 V
DD
V
P
R
L
V
P
4 V
DD
V
P
2 P
L
R
L
BTL
2 P
L
R
L
4 V
DD
Where:
Therefore,
Table 3 employs equation 8 to calculate efficiencies for four different output power levels. Note that 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. Note that 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. For a stereo 1-W audio system with 8-
loads and a 5-V supply, the maximum
draw on the power supply is almost 3.25 W.
Table 3. Efficiency Vs Output Power in 5-V 8-
BTL Systems
Output Power
(W)
Efficiency
(%)
Peak Voltage
(V)
Internal Dissipation
(W)
0.25
31.4
2.00
0.55
0.50
44.4
2.83
0.62
1.00
62.8
4.00
4.47
0.59
1.25
70.2
0.53
High peak voltages cause the THD to increase.
A final point to remember about Class-AB amplifiers (either SE or BTL) is how to manipulate the terms in the
efficiency equation to utmost advantage when possible. Note that in equation 8, V
DD
is in the denominator. This
indicates that as V
DD
goes down, efficiency goes up.
相關(guān)PDF資料
PDF描述
TPA0312PWPR SWITCH, DPDT, R/A, PCB, ON-OFF-ON; Switch function type:On-Off-On; Material, contact:Copper Alloy; Temp, op. max:85(degree C); Temp, op. min:-30(degree C); Length / Height, external:9.14mm; Width, external:8.13mm; Depth, RoHS Compliant: Yes
TPA032D02DCAR Dual Audio Amplifier
TPA100RL SINGLE BIDIRECTIONAL BREAKOVER DIODE|133V V(BO) MAX|800MA I(S)|DO-204AC
TPA120RL DIP Switch; No. of Switch Positions:6; Circuitry:SPST; Contact Current Max:25mA; Switch Terminals:SMT Gull Wing; Overall Length:8.75mm; Pitch Spacing:1.28mm; Series:TDA; Actuator Style:Flush Slide RoHS Compliant: Yes
TPA130RL SINGLE BIDIRECTIONAL BREAKOVER DIODE|173V V(BO) MAX|800MA I(S)|DO-204AC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPA0122PWPG4 功能描述:音頻放大器 2W Stereo A 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA0122PWPR 功能描述:音頻放大器 2W Stereo APA With Int Gain Settings 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA0122PWPRG4 功能描述:音頻放大器 2W Stereo APA With Int Gain Settings 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
TPA0132 制造商:TI 制造商全稱:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL
TPA0132EVM 功能描述:音頻 IC 開發(fā)工具 TPA0132 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*