參數(shù)資料
型號: LM4670
廠商: National Semiconductor Corporation
元件分類: 音頻放大器
英文描述: Filterless High Efficiency 3W Switching Audio Amplifier
中文描述: 濾波高效3W開關音頻放大器
文件頁數(shù): 1/18頁
文件大?。?/td> 1080K
代理商: LM4670
LM4670
Filterless High Efficiency 3W Switching Audio Amplifier
General Description
The LM4670 is a fully integrated single-supply high efficiency
switching audio amplifier. It features an innovative modulator
that eliminates the LC output filter used with typical switching
amplifiers. Eliminating the output filter reduces external com-
ponent count, simplifies circuit design, and reduces board
area. The LM4670 processes analog inputs with a delta-
sigma modulation technique that lowers output noise and
THD when compared to conventional pulse width modula-
tors.
The LM4670 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 2.3W with
less than 1% THD+N. Its flexible power supply requirements
allow operation from 2.4V to 5.5V.
The LM4670 has high efficiency with speaker loads com-
pared to a typical Class AB amplifier. With a 3.6V supply
driving an 8
speaker, the IC’s efficiency for a 100mW
power level is 77%, reaching 88% at 600mW output power.
The LM4670 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 LM4670 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 77% (typ)
j
Efficiency at 3.6V, 600mW into 8
speaker 88% (typ)
j
Efficiency at 5V, 1W into 8
speaker
j
Quiescent current, 3.6V supply
j
Total shutdown power supply current
j
Single supply range
87% (typ)
4.8mA (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: 1.35ms (typ)
n
Minimum external components
n
"Click and pop" suppression circuitry
n
Micro-power shutdown mode
n
Short circuit protection
n
Available in space-saving microSMD and LLP packages
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
20089901
FIGURE 1. Typical Audio Amplifier Application Circuit
December 2004
L
2004 National Semiconductor Corporation
DS200899
www.national.com
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相關代理商/技術參數(shù)
參數(shù)描述
LM4670_06 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 3W Switching Audio Amplifier
LM4670ITL 功能描述:IC AMP AUDIO PWR 3W MONO D 9USMD RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:D 類 輸出類型:1-通道(單聲道),帶立體聲耳機 在某負載時最大輸出功率 x 通道數(shù)量:930mW x 1 @ 8 歐姆; 40mW x 2 @ 16 歐姆 電源電壓:2.7 V ~ 5.5 V 特點:消除爆音,差分輸入,I²C,靜音,關閉,音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP(2.09x2.09) 封裝/外殼:25-WFBGA,WLCSP 包裝:帶卷 (TR) 其它名稱:MAX97000EWA+T-ND
LM4670ITL/NOPB 功能描述:音頻放大器 Filterless Hi Eff 3W Switching 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
LM4670ITLX 功能描述:IC AMP AUDIO PWR 3W MONO D 9USMD RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻放大器 系列:Boomer® 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:DirectDrive® 類型:D 類 輸出類型:1-通道(單聲道),帶立體聲耳機 在某負載時最大輸出功率 x 通道數(shù)量:930mW x 1 @ 8 歐姆; 40mW x 2 @ 16 歐姆 電源電壓:2.7 V ~ 5.5 V 特點:消除爆音,差分輸入,I²C,靜音,關閉,音量控制 安裝類型:表面貼裝 供應商設備封裝:25-WLP(2.09x2.09) 封裝/外殼:25-WFBGA,WLCSP 包裝:帶卷 (TR) 其它名稱:MAX97000EWA+T-ND
LM4670ITLX/NOPB 功能描述:音頻放大器 Filterless Hi Eff 3W Switching 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: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel