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參數(shù)資料
| 型號： | LM4850LD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| 中文描述： | 0.3 W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO14 |
| 封裝： | 0.118 INCH, 0.80 MM PITCH, LLP-14 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 1112K |
| 代理商： | LM4850LD |
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
in con-
junction with C
create a highpass filter. Find the coupling
capacitor’s value using Equation 9.
C
I
≥
1 / (2
π
R
I
f
L
)
(9)
C
I
≥
1 / ( 2
π
x 20k
x 20Hz) = 0.397μF
Use a 0.39μF capacitor, the closest standard value.
The high frequency pole is determined by the product of the
desired high frequency pole, f
, and the differential gain,
A
. With A
= 3 and f
= 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.
L
www.national.com
14
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| LM4850MM | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4850MT | Mono 1.5 W / Stereo 300 mW Power Amplifier |
| LM4851 | Integrated Audio Amplifier System |
| LM4851LQ | Integrated Audio Amplifier System |
| LM4851IBL | Integrated Audio Amplifier System |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4850LDX | 制造商:Rochester Electronics LLC 功能描述:1.5W MON AUD&95MW HEADPHN AMP - Bulk |
| LM4850MM | 制造商:NSC 制造商全稱: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 類別:集成電路 (IC) >> 線性 - 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:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負(fù)載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風(fēng)，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (TR) |
| LM4850MMX | 功能描述:IC AMP AUDIO PWR 1.9W AB 10MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 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:2,500 系列:DirectDrive® 類型:H 類 輸出類型:耳機，2-通道（立體聲） 在某負(fù)載時最大輸出功率 x 通道數(shù)量:35mW x 2 @ 16 歐姆 電源電壓:1.62 V ~ 1.98 V 特點:I²C，麥克風(fēng)，靜音，短路保護，音量控制 安裝類型:表面貼裝 供應(yīng)商設(shè)備封裝:25-WLP（2.09x2.09） 封裝/外殼:25-WFBGA，WLCSP 包裝:帶卷 (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 |
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