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參數(shù)資料
| 型號(hào)： | LM4671 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 音頻放大器 |
| 英文描述： | Filterless High Efficiency 2.5W Switching Audio Amplifier |
| 中文描述： | 濾波2.5W的高效率開關(guān)音頻放大器 |
| 文件頁(yè)數(shù)： | 1/18頁(yè) |
| 文件大?。?/td> | 969K |
| 代理商： | LM4671 |
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LM4671
Filterless High Efficiency 2.5W Switching Audio
Amplifier
General Description
The LM4671 is a single supply, high efficiency 2.5W switch-
ing audio amplifier. A low noise, filterless PWM architecture
eliminates the output filter, reducing external component
count, board area consumption, system cost, and simplifying
design.
The LM4671 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 5V supply, it is capable of driving a 4
speaker load at a continuous average output of 2.1W with
less than 1% THD+N. Its flexible power supply requirements
allow operation from 2.4V to 5.5V.
The LM4671 has high efficiency with speaker loads com-
pared to a typical Class AB amplifier. With a 3V supply
driving an 8
speaker, the IC’s efficiency for a 100mW
power level is 80%, reaching 88% at 400mW output power.
The LM4671 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The gain of the LM4671 is externally configurable which
allows independent gain control from multiple sources by
summing the signals.
Key Specifications
j
Efficiency at 3.6V, 100mW into 8
speaker 80% (typ)
j
Efficiency at 3.6V, 400mW into 8
speaker 88% (typ)
j
Efficiency at 5V, 1W into 8
speakerr
j
Quiescent current, 3.6V supply
j
Total shutdown power supply current
j
Single supply range
86% (typ)
2.8mA (typ)
0.01μA (typ)
2.4V to 5.5V
Features
n
No output filter required for inductive loads
n
Externally configurable gain
n
Very fast turn on time: 1ms (typ)
n
Minimum external components
n
"Click and pop" suppression circuitry
n
Micro-power shutdown mode
n
Available in space-saving microSMD package
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
201073J3
FIGURE 1. Typical Audio Amplifier Application Circuit
March 2005
L
2005 National Semiconductor Corporation
DS201073
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4671_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 2.5W Switching Audio Amplifier |
| LM4671_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 2.5W Switching Audio Amplifier |
| LM4671ITL | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 2.5W Class-AB 9-Pin uSMD T/R 制造商:Texas Instruments 功能描述:IC AMP FILTERLESS 2.5W SMD 4671 |
| LM4671ITL/NOPB | 功能描述:音頻放大器 Filterless Hi Eff 2.5W Swtch Audio Amp 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 |
| LM4671ITLBD | 功能描述:BOARD EVALUATION LM4671ITL RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)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:- |
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