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參數(shù)資料
| 型號： | LM4951 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Wide Voltage Range 1.8 Watt Audio Amplifier |
| 中文描述： | 寬電壓范圍1.8瓦音頻功率放大器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 1119K |
| 代理商： | LM4951 |
Application Information
(Continued)
The last step in this design example is setting the amplifier’s
-3dB frequency bandwidth. To achieve the desired
±
0.25dB
pass band magnitude variation limit, the low frequency re-
sponse must extend to at least one-fifth the lower bandwidth
limit and the high frequency response must extend to at least
five times the upper bandwidth limit. The gain variation for
both response limits is 0.17dB, well within the
±
0.25dB-
desired limit. The results are an
f
L
= 50Hz / 5 = 10Hz
(11)
and an
f
L
= 20kHz x 5 = 100kHz
(12)
As mentioned in the
SELECTING EXTERNAL COMPO-
NENTS
section, R
and C
create a highpass filter that sets
the amplifier’s lower bandpass frequency limit. Find the cou-
pling capacitor’s value using Equation (13).
C
i
= 1
/
2
π
R
i
f
L
(13)
The result is
1
/
(2
π
x20k
x10Hz) = 0.795μF
Use a 0.82μF capacitor, the closest standard value.
The product of the desired high frequency cutoff (100kHz in
this example) and the differential gain A
VD
, determines the
upper passband response limit. With A
VD
= 7 and f
H
=
100kHz, the closed-loop gain bandwidth product (GBWP) is
700kHz. This is less than the LM4951’s 3.5MHz GBWP. With
this margin, the amplifier can be used in designs that require
more differential gain while avoiding performance restricting
bandwidth limitations.
RECOMMENDED PRINTED CIRCUIT BOARD LAYOUT
Figures 2–4 show the recommended two-layer PC board
layout that is optimized for the SD10A. This circuit is de-
signed for use with an external 7.5V supply 8
(min) speak-
ers.
These circuit boards are easy to use. Apply 7.5V and ground
to the board’s V
and GND pads, respectively. Connect a
speaker between the board’s OUT
A
and OUT
B
outputs.
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4951A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Wide Voltage Range 1.8 Watt Audio Amplifier With Short Circuit Protection |
| LM4951ASD | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4951ASD/NOPB | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| LM4951ASDBD | 功能描述:BOARD EVALUATION FOR LM4951A RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- |
| LM4951ASDBD/NOPB | 功能描述:音頻 IC 開發(fā)工具 LM4951ASD EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
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