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参数资料
| 型号： | LM4850LDX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封装： | 0.118 INCH, 0.80 MM PITCH, LLP-14 |
| 文件页数： | 6/20页 |
| 文件大小： | 1112K |
| 代理商： | LM4850LDX/NOPB |
Application Information (Continued)
extend to at least onefifth the lower bandwidth limit and the
high frequency response must extend o at least five times
the upper bandwidth limit. The variation for both response
limits is 0.17dB, well within the ± 0.25dB desired limit. This
results in:
f
L = 100Hz / 5 = 20Hz
f
H = 20kHz x 5 = 100kHz
As stated in the External Components section, R
I in con-
junction with C
I create a highpass filter. Find the coupling
capacitor’s value using Equation 9.
C
I
≥ 1/(2πR
IfL)
(9)
C
I
≥ 1/(2π x 20k x 20Hz) = 0.397F
Use a 0.39F capacitor, the closest standard value.
The high frequency pole is determined by the product of the
desired high frequency pole, f
H, and the differential gain,
A
VD. With AVD = 3 and fH = 100kHz, the resulting GBWP =
150kHz which is much smaller than the LM4850 GBWP of
10MHz. This difference indicates that a designer can still use
the LM4850 at higher differential gains without bandwidth
limitations.
PCB LAYOUT AND SUPPLY REGULATION
CONSIDERATIONS FOR DRIVING 3
AND 4 LOADS
Power dissipated by a load is a function of the voltage swing
across the load and the load’s impedance. As load imped-
ance decreases, load dissipation becomes increasingly de-
pendant on the interconnect (PCB trace and wire) resistance
between the amplifier output pins and the load’s connec-
tions. Residual trace resistance causes a voltage drop,
which results in power dissipated in the trace and not in the
load as desired. For example, 0.1
trace resistance reduces
the output power dissipated by a 4
load from 2.0W to
1.95W. This problem of decreased load dissipation is exac-
erbated as load impedance decreases. Therefore, to main-
tain the highest load dissipation and widest output voltage
swing, PCB traces that connect the output pins to a load
must be as wide as possible.
Poor power supply regulation adversely affects maximum
output power. A poorly regulated supply’s output voltage
decreases with increasing load current. Reduced supply
voltage causes decreased headroom, output signal clipping,
and reduced output power. Even with tightly regulated sup-
plies, trace resistance creates the same effects as poor
supply regulation. Therefore, making the power supply
traces as wide as possible helps maintain full output voltage
swing.
LM4850
www.national.com
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM4850MM | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4850MM/NOPB | 功能描述:IC AMP AUDIO PWR 1.9W AB 10MSOP 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) |
| LM4850MMX | 功能描述:IC AMP AUDIO PWR 1.9W AB 10MSOP 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) |
| LM4850MMX/NOPB | 制造商:Texas Instruments 功能描述:Audio Amp Headphone/Speaker 1-CH Mono/2-CH Stereo 1.5W Class-AB 10-Pin MSOP T/R |
| LM4850MT | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Mono 1.5 W / Stereo 300 mW Power Amplifier |
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