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參數(shù)資料
| 型號： | LM4671ITLX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9 |
| 封裝： | MICRO, SMD-9 |
| 文件頁數(shù)： | 1/10頁 |
| 文件大?。?/td> | 589K |
| 代理商： | LM4671ITLX/NOPB |
March 3, 2008
LM4671
Filterless High Efficiency 2.5W Switching Audio Amplifier
General Description
The LM4671 is a single supply, high efficiency 2.5W switching
audio amplifier. A low noise, filterless PWM architecture elim-
inates 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 op-
eration from 2.4V to 5.5V.
The LM4671 has high efficiency with speaker loads compared
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 al-
lows independent gain control from multiple sources by sum-
ming the signals.
Key Specifications
■Efficiency @ 3.6V, 100mW into
8 speaker
80% (typ)
■Efficiency @ 3.6V, 400mW into
8 speaker
88% (typ)
■Efficiency @ 5V, 1W into 8
speaker
86% (typ)
■Quiescent current, 3.6V supply
2.8mA (typ)
■Total shutdown power supply
current
0.01A (typ)
■Single supply range
2.4V to 5.5V
Features
■ No output filter required for inductive loads
■ Externally configurable gain
■ Very fast turn on time: 17μs (typ)
■ Minimum external components
■ "Click and pop" suppression circuitry
■ Micro-power shutdown mode
■ Available in space-saving microSMD package
Applications
■ Mobile phones
■ PDAs
■ Portable electronic devices
Typical Application
201073j3
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer is a registered trademark of National Semiconductor Corporation.
2008 National Semiconductor Corporation
201073
www.national.com
LM4671
Filterless
High
Efficiency
2.5W
Switching
Audio
Amplifier
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM4673 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless, 2.65W, Mono, Class D Audio Power Amplifier |
| LM4673_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless, 2.65W, Mono, Class D Audio Power Amplifier |
| LM4673SD | 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 |
| LM4673SD/NOPB | 功能描述:音頻放大器 FILTERLES,2.65W,MONO CLASS D AUD PWR 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 |
| LM4673SDBD | 功能描述:音頻 IC 開發(fā)工具 LM4673SD 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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