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參數資料
| 型號： | TPA4861D |
| 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, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 7/26頁 |
| 文件大小： | 623K |
| 代理商： | TPA4861D |
www.ti.com
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)
TPA4861
SLOS163C – 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 (TPA4861 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.
15
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相關代理商/技術參數 |
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|---|---|
| TPA4861DG4 | 功能描述:音頻放大器 1W Mono Audio RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA4861DR | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA4861DRG4 | 功能描述:音頻放大器 1-W Mono Audio Power Amplifier RoHS:否 制造商:STMicroelectronics 產品: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 |
| TPA-5 | 功能描述:保險絲 TELPOWER ALARM FUSE RoHS:否 制造商:Littelfuse 產品:Surface Mount Fuses 電流額定值:0.5 A 電壓額定值:600 V 保險絲類型:Fast Acting 保險絲大小/組:Nano 尺寸:12.1 mm L x 4.5 mm W 安裝風格: 端接類型:SMD/SMT 系列:485 |
| TPA-5,0-ADV | 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM 制造商:PMK 功能描述:ADVANCED PROBE ACCESSORIES 5, 0MM; Kit Contents:Probe Kit, 18 Piece; Body Diameter:5.0mm; For Use With:5mm PMK Probes; Primary Product 1:220mm Ground Lead with Crocodile Clips; Primary Product 2:Sprung Hook; Primary Product 3:Contact;RoHS Compliant: NA |
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