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参数资料
| 型号： | LM4766MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 40 W, 2 CHANNEL, AUDIO AMPLIFIER, UUC |
| 封装： | WAFER |
| 文件页数： | 5/17页 |
| 文件大小： | 534K |
| 代理商： | LM4766MWC |
Application Information (Continued)
verify that with the required power supply voltage and load
impedance, that the required heatsink value
θ
SA is feasible
given system cost and size constraints. Once the heatsink
issues have been addressed, the required gain can be de-
termined from
Equation (6).
(6)
From
Equation (6), the minimum A
V is:
A
V ≥ 15.5.
By selecting a gain of 21, and with a feedback resistor, R
f =
20k
, the value of R
i follows from Equation (7).
R
i =Rf (AV 1)
(7)
Thus with R
i =1k a non-inverting gain of 21 will result.
Since the desired input impedance was 47k
, a value of
47k
was selected for R
IN. The final design step is to
address the bandwidth requirements which must be stated
as a pair of 3dB frequency points. Five times away from a
3dB point is 0.17dB down from passband response which
is better than the required ±0.25dB specified. This fact re-
sults in a low and high frequency pole of 4Hz and 100kHz
respectively. As stated in the External Components sec-
tion, R
i in conjunction with Ci create a high-pass filter.
C
i ≥ 1/(2π * 1k * 4Hz) = 39.8F;
use 39F.
The high frequency pole is determined by the product of the
desired high frequency pole, f
H, and the gain, AV. With a
A
V = 21 and fH = 100kHz, the resulting GBWP is 2.1MHz,
which is less than the guaranteed minimum GBWP of the
LM4766 of 8MHz. This will ensure that the high frequency
response of the amplifier will be no worse than 0.17dB down
at 20kHz which is well within the bandwidth requirements of
the design.
LM4766
www.national.com
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4766T | 功能描述:音频放大器 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 |
| LM4766T | 制造商:Texas Instruments 功能描述:IC AMP DUAL 40W 4766 TO-220-15 |
| LM4766T/LF15 | 功能描述:音频放大器 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 |
| LM4766T/NOPB | 功能描述:音频放大器 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 |
| LM4766TF | 功能描述:音频放大器 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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