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參數資料
| 型號： | TPA6211A1DGN |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.45 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封裝： | GREEN, PLASTIC, MSOP-8 |
| 文件頁數： | 13/32頁 |
| 文件大小： | 916K |
| 代理商： | TPA6211A1DGN |
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θ
JA
+
1
Derating Factor
+
1
0.0218
+ 45.9
°C W
(17)
T
A Max + TJ Max * θJA PDmax
+ 150 * 45.9 (1.27) + 91.7°C
(18)
P
Dmax +
2V2
DD
p 2
R
L
(16)
SLOS367C – AUGUST 2003 – REVISED JUNE 2008........................................................................................................................................................ www.ti.com
Table 2 employs Equation 15 to calculate efficiencies
The maximum ambient temperature depends on the
for four different output power levels. Note that the
heat sinking ability of the PCB system. The derating
efficiency of the amplifier is quite low for lower power
factor for the 3 mm ×3 mm DRB package is shown in
levels and rises sharply as power to the load is
the dissipation rating table. Converting this to
θ
JA:
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
Given
θ
JA,
the
maximum
allowable
junction
efficiency for a specific system is the key to proper
temperature, and the maximum internal dissipation,
power supply design. For a 2.8-W audio system with
the maximum ambient temperature can be calculated
4-
loads and a 5-V supply, the maximum draw on
with Equation 18. The maximum recommended
the power supply is almost 3.8 W.
junction temperature for the TPA6211A1 is 150°C.
A final point to remember about Class-AB amplifiers
is how to manipulate the terms in the efficiency
equation to the utmost advantage when possible.
Equation 18 shows that the maximum ambient
This indicates that as VDD goes down, efficiency goes
temperature is 91.7°C (package limited to 85°C
up.
ambient) at maximum power dissipation with a 5-V
A simple formula for calculating the maximum power
supply.
dissipated, PDmax, may be used for a differential
Table 2 shows that for most applications no airflow is
output application:
required
to
keep
junction
temperatures
in
the
specified range. The TPA6211A1 is designed with
thermal protection that turns the device off when the
junction temperature surpasses 150°C to prevent
damage to the IC. In addition, using speakers with an
PDmax for a 5-V, 4- system is 1.27 W.
impedance higher than 4-
dramatically increases
the thermal performance by reducing the output
current.
20
Copyright 2003–2008, Texas Instruments Incorporated
Product Folder Link(s): TPA6211A1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPA6211A1DGNG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB 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 |
| TPA6211A1DGNR | 功能描述:音頻放大器 Mono Fully Diff Class-AB 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 |
| TPA6211A1DGNRG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB 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 |
| TPA6211A1DRB | 功能描述:音頻放大器 Mono Fully Diff Class-AB 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 |
| TPA6211A1DRBG4 | 功能描述:音頻放大器 Mono Fully Diff Class-AB 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 |
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