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| 型号： | TPA6020A2RGWRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 2.15 W, 2 CHANNEL, AUDIO AMPLIFIER, PQCC20 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, VQFN-20 |
| 文件页数： | 13/27页 |
| 文件大小： | 1948K |
| 代理商： | TPA6020A2RGWRG4 |
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q
JA =
=
= 41.7 C/W
o
1
Derating Factor
0.2398
(17)
T
A Max = T
P
J
JA
D
Max -
Max
q
= 150 - 41.7(2.53) = 44.5 C/W
o
(18)
P
Dmax
=
4 V
DD
2
p
2
R
L
(16)
TPA6020A2
SLOS458B – JULY 2005 – REVISED AUGUST 2005
for four different output power levels. Note that the
efficiency of the amplifier is quite low for lower power
Given
θ
JA, the maximum allowable junction tempera-
levels and rises sharply as power to the load is
ture, and the maximum internal dissipation, the maxi-
increased resulting in a nearly flat internal power
mum ambient temperature can be calculated with
dissipation over the normal operating range. Note that
Equation 18. The maximum recommended junction
the internal dissipation at full output power is less
temperature for the TPA6020A2 is 150
°C.
than in the half power range. Calculating the ef-
ficiency for a specific system is the key to proper
power supply design. For a 2.8-W audio system with
3-
loads and a 5-V supply, the maximum draw on
the power supply is almost 8.8 W.
Equation 18 shows that the maximum ambient tem-
perature is 44.5
°C at maximum power dissipation
A final point to remember about Class-AB amplifiers
with a 5-V supply.
is how to manipulate the terms in the efficiency
equation to the utmost advantage when possible.
Table 2 shows that for most applications no airflow is
Note that in Equation 15, VDD is in the denominator.
required to keep junction temperatures in the speci-
This indicates that as VDD goes down, efficiency goes
fied range. The TPA6020A2 is designed with thermal
up.
protection that turns the device off when the junction
temperature surpasses 150
°C to prevent damage to
A simple formula for calculating the maximum power
the IC. In addition, using speakers with an impedance
dissipated, PDmax, may be used for a stereo, differen-
higher than 4
dramatically increases the thermal
tial output application:
performance by reducing the output current.
The TPA6020A2 is capable of driving impedances as
low as 3
, but special layout techniques must be
considered in order to achieve optimal performance.
In a 5-V, 3-
stereo system, the maximum ambient
PDmax for a 5-V, 4- system is 2.53 W.
temperature is just 9.1
°C . To increase the maximum
The maximum ambient temperature depends on the
ambient temperature,
θ
JA has to be reduced. This is
heat sinking ability of the PCB system. The derating
achieved by increasing the amount of copper on the
factor for the 5 mm x 5 mm QFN package is shown in
board. Using 3 oz. or 4 oz. copper, and/or additional
the dissipation rating table. Converting this to
θ
JA:
layers, increases the thermal performance of the
device.
20
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相关代理商/技术参数 |
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| TPA6020A2RGWT | 功能描述:音频放大器 Stereo Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6020A2RGWTG4 | 功能描述:音频放大器 Stereo Fully Diff Class-AB RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA6021A4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:2-W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL |
| TPA6021A4EVM | 功能描述:音频 IC 开发工具 TPA6021A4 Eval Mod RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| TPA6021A4N | 功能描述:音频放大器 Stereo Class-AB w/Ster Hdphn Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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