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參數(shù)資料
| 型號： | LM4766 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Audio Power Amplifier Series Dual 40W Audio Power Amplifier with Mute |
| 中文描述： | 音頻功率放大器系列雙功率40W音頻功率放大器靜音 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大小： | 477K |
| 代理商： | LM4766 |
Application Information
(Continued)
verify that with the required power supply voltage and load
impedance, that the required heatsink value
θ
is feasible
given system cost and size constraints. Once the heatsink
issues have been addressed, the required gain can be deter-
mined from Equation (6)
(6)
From Equation (6) the minimum A
V
is:
By selecting a gain of 21, and with a feedback resistor, R
f
=
20 k
, the value of R
i
follows from Equation (7)
R
i
= R
f
(A
V
1)
Thus with R
= 1 k
a non-inverting gain of 21 will result.
Since the desired input impedance was 47 k
, a value of
47 k
was selected for R
IN
. The final design step is to ad-
A
V
≥
15.5.
(7)
dress the bandwidth requirements which must be stated as a
pair of 3 dB frequency points. Five times away from a 3 dB
point is 0.17 dB down from passband response which is bet-
ter than the required
±
0.25 dB specified. This fact results in
a low and high frequency pole of 4 Hz and 100 kHz respec-
tively. As stated in the
External Components
section, R
i
in
conjunction with C
i
create a high-pass filter.
C
i
≥
1/(2
π
*
1 k
*
4 Hz) = 39.8 μF;
The high frequency pole is determined by the product of the
desired high frequency pole, f
, and the gain, A
. With a
A
= 21 and f
= 100 kHz, the resulting GBWP is 2.1 MHz,
which is less than the guaranteed minimum GBWP of the
LM4766 of 8 MHz. This will ensure that the high frequency
response of the amplifier will be no worse than 0.17 dB down
at 20 kHz which is well within the bandwidth requirements of
the design.
use 39 μF.
www.national.com
13
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM4766_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Audio Power Amplifier Series Dual 40W Audio Power Amplifier with Mute |
| LM4766T | 功能描述:音頻放大器 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 |
| LM4766T | 制造商:Texas Instruments 功能描述:IC AMP DUAL 40W 4766 TO-220-15 |
| LM4766T/LF15 | 功能描述:音頻放大器 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 |
| LM4766T/NOPB | 功能描述:音頻放大器 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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