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参数资料
| 型号： | LM4906LD/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO10 |
| 封装： | LLP-10 |
| 文件页数： | 3/16页 |
| 文件大小： | 888K |
| 代理商： | LM4906LD/NOPB |
Application Information (Continued)
C
i. A larger input coupling capacitor requires more charge to
reach its quiescent DC voltage (nominally 1/2 V
DD). This
charge comes from the output via the feedback and is apt to
create pops upon device enable. Thus, by minimizing the
capacitor size based on necessary low frequency response,
turn-on pops can be minimized.
AUDIO POWER AMPLIFIER DESIGN
A 1W/8
Audio Amplifier
Given:
Power Output
1 Wrms
Load Impedance
8
Input Level
1 Vrms
Input Impedance
20 k
Bandwidth
100 Hz–20 kHz ± 0.25 dB
A designer must first determine the minimum supply rail to
obtain the specified output power. By extrapolating from the
Output Power vs Supply Voltage graphs in the Typical Per-
formance Characteristics section, the supply rail can be
easily found.
Extra supply voltage creates headroom that allows the
LM4906 to reproduce peaks in excess of 1W without pro-
ducing audible distortion. At this time, the designer must
make sure that the power supply choice along with the
output impedance does not violate the conditions explained
in the Power Dissipation section.
The gain of the LM4906 is internally set at either 6dB or
12dB.
The final design step is to address the bandwidth require-
ments 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.
f
L = 100Hz/5= 20Hz
f
H = 20kHz*5= 100kHz
As stated in the External Components section, R
in (20k) in
conjunction with C
2 create a highpass filter.
C
2
≥ 1/(2π*20k*20Hz) = 0.397F; use 0.39F
200571C0
FIGURE 2. REFERENCE DESIGN BOARD SCHEMATIC
LM4906
www.national.com
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相关PDF资料 |
PDF描述 |
|---|---|
| LM4906GR/NOPB | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA12 |
| LM4907LD | 1.07 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8 |
| LM4908MM/NOPB | 0.157 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| LM4908MA/NOPB | 0.157 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| LM4908LQ/NOPB | 0.157 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4906LDX | 功能描述:IC AMP AUDIO PWR 1W MONO 10LLP RoHS:是 类别:集成电路 (IC) >> 线性 - 音頻放大器 系列:Boomer® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:DirectDrive® 类型:H 类 输出类型:耳机，2-通道（立体声） 在某负载时最大输出功率 x 通道数量:35mW x 2 @ 16 欧姆 电源电压:1.62 V ~ 1.98 V 特点:I²C，麦克风，静音，短路保护，音量控制 安装类型:表面贴装 供应商设备封装:25-WLP（2.09x2.09） 封装/外壳:25-WFBGA，WLCSP 包装:带卷 (TR) |
| LM4906LDX/NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 1W Class-AB 10-Pin LLP EP T/R |
| LM4906MM | 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 |
| LM4906MM/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 |
| LM4906MMBD | 功能描述:音频 IC 开发工具 LM4906MM EVAL BOARD 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 |
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