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參數(shù)資料
| 型號： | TPA4860DR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| 封裝： | GREEN, PLASTIC, MS-012AC, SOIC-16 |
| 文件頁數(shù)： | 8/27頁 |
| 文件大小： | 632K |
| 代理商： | TPA4860DR |
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V
L(RMS) +
V
P
2
I
DD(RMS) +
2V
P
p
R
L
P
SUP + VDD IDD(RMS) +
V
DD 2VP
p
R
L
Efficiency +
P
L
P
SUP
P
L +
V
L(RMS)
2
R
L
+
Vp
2
2R
L
Where:
(3)
Efficiency of a BTL configuration
+
p
V
P
2V
DD
+
p
P
LRL
2
1 2
2V
DD
(4)
TPA4860
SLOS164B – SEPTEMBER 1996 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Table 1 employs Equation 4 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 1. Efficiency vs Output Power in 5-V 8-
BTL Systems
PEAK-TO-PEAK
INTERNAL
OUTPUT POWER
EFFICIENCY
VOLTAGE
DISSIPATION
(W)
(%)
(V)
(W)
0.25
31.4
2.00
0.55
0.50
44.4
2.83
0.62
1.00
62.8
4.00
0.59
1.25
70.2
4.47(1)
0.53
(1)
High peak voltages cause the THD to increase.
A final point to remember about linear amplifiers whether they are SE or BTL configured is how to manipulate the
terms in the efficiency equation to utmost advantage when possible. Note that in Equation 4, VDD is in the
denominator. This indicates that as VDD goes down, efficiency goes up.
For example, if the 5-V supply is replaced with a 10-V supply (TPA4860 has a maximum recommended VDD of
5.5 V) in the calculations of Table 1, then efficiency at 1 W would fall to 31% and internal power dissipation
would rise to 2.18 W from 0.59 W at 5 V. Then, for a stereo 1-W system from a 10-V supply, the maximum draw
would be almost 6.5 W. Choose the correct supply voltage and speaker impedance for the application.
16
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| TPA4860D | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA4860DG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
| TPA4860DRG4 | 1.1 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO16 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA4860DRG4 | 功能描述:音頻放大器 1-W Mono Audio 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA4860EVM | 功能描述:音頻 IC 開發(fā)工具 TPA4860 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 |
| TPA4861 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
| TPA4861_07 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1-W MONO AUDIO POWER AMPLIFIER |
| TPA4861D | 功能描述:音頻放大器 1W Mono Audio 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 |
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