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參數(shù)資料
| 型號： | TPA301DG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.7 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大小： | 765K |
| 代理商： | TPA301DG4 |
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I
DD RMS +
2V
P
p
R
L
P
SUP + VDD IDD RMS +
V
DD 2VP
p
R
L
Efficiency +
P
L
P
SUP
where
P
L +
V
L RMS
2
R
L
+
Vp
2
2R
L
V
L RMS +
V
P
2
(3)
Efficiency of a BTL Configuration
+
p
V
P
2V
DD
+
p
P
LRL
2
1 2
2V
DD
(4)
APPLICATION SCHEMATIC
TPA301
SLOS208E – JANUARY 1998 – REVISED JUNE 2004
APPLICATION INFORMATION (continued)
Table 1 employs Equation 4 to calculate efficiencies for three different output power levels. 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. 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.
Table 1. Efficiency vs Output Power in 3.3-V 8-
BTL Systems
PEAK-to-PEAK
INTERNAL
OUTPUT POWER
EFFICIENCY
VOLTAGE
DISSIPATION
(W)
(%)
(V)
(W)
0.125
33.6
1.41
0.26
0.25
47.6
2.00
0.29
0.375
58.3
2.45(1)
0.28
(1)
High-peak voltage values cause the THD to increase.
A final point to remember about linear amplifiers (either SE or BTL) 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.
Figure 26 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of –10 V/V.
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPA301DGH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TPA301DGN | 功能描述:音頻放大器 0.35W Mono 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 |
| TPA301DGNG4 | 功能描述:音頻放大器 0.35-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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA301DGNR | 功能描述:音頻放大器 0.35-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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| TPA301DGNRG4 | 功能描述:音頻放大器 0.35-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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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