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參數資料
| 型號： | LM4664 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 音頻放大器 |
| 英文描述： | Filterless High Efficiency 1.1W Switching Audio Amplifier |
| 中文描述： | 濾波高效率開關音頻放大器1.1W |
| 文件頁數： | 1/14頁 |
| 文件大小： | 550K |
| 代理商： | LM4664 |
LM4664
Filterless High Efficiency 1.1W Switching Audio
Amplifier
General Description
The LM4664 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 parts count,
simplifies circuit design, and reduces board area. The
LM4664 processes analog inputs with a delta-sigma modu-
lation technique that lowers output noise and THD when
compared to conventional pulse width modulators.
The LM4664 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 3V supply, it is capable of driving 8
trans-
ducer loads at a continuous average output of 425mW with
less than 1%THD+N. Its flexible power supply requirements
allow operation from 2.7V to 5.5V.
The LM4664 has high efficiency with an 8
transducer load
compared to a typical Class AB amplifier. With a 3V supply,
the IC’s efficiency for a 100mW power level is 74%, reaching
84% at 425mW output power.
The LM4664 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
The LM4664 has fixed selectable gain of either 6dB or 12dB.
The LM4664 has short circuit protection against a short from
the outputs to V
DD
, GND, or across the outputs.
Key Specifications
j
Efficiency at 3V, 100mW into 8
transducer 74% (typ)
j
Efficiency at 3V, 425mW into 8
transducer 84% (typ)
j
Efficiency at 5V, 1W into 8
transducer
j
Total quiescent power supply current
j
Total shutdown power supply current
j
Single supply range
86% (typ)
3.5mA (typ)
0.4μA (typ)
2.7V to 5.5V
Features
n
No output filter required for inductive transducers
n
Selectable gain of 6dB or 12dB
n
Very fast turn on time: 7ms (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 micro SMD package
Applications
n
Mobile phones
n
PDAs
n
Portable electronic devices
Typical Application
Boomer
is a registered trademark of National Semiconductor Corporation.
200960G5
FIGURE 1. Typical Audio Amplifier Application Circuit
March 2004
L
2004 National Semiconductor Corporation
DS200960
www.national.com
相關PDF資料 |
PDF描述 |
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| LM4665 | Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665ITLX | Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665LD | Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665MM | Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665ITL | Filterless High Efficiency 1W Switching Audio Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM4664ITL | 制造商:Texas Instruments 功能描述:AMP FILTERLESS CLASS-A 1.1W 4664 |
| LM4665 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Filterless High Efficiency 1W Switching Audio Amplifier |
| LM4665 WAF | 制造商:Texas Instruments 功能描述: |
| LM4665B WAF | 制造商:Texas Instruments 功能描述: |
| LM4665ITL | 制造商:Texas Instruments 功能描述:Audio Amp Speaker 1-CH Mono 1.4W Class-AB 9-Pin uSMD T/R 制造商:Texas Instruments 功能描述:1W Class D Switching Amplifier,LM4665ITL |
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