LM4675

更新时间： 2024-11-16 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器
页数	文件大小	规格书
19页	925K
描述
Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum

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LM4675 数据手册

August 2006

LM4675

Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio

Power Amplifier with Spread Spectrum

General Description

Key Specifications

The LM4675 is a single supply, high efficiency, 2.65W, mono,

Class D audio amplifier. A spread spectrum, filterless PWM

architecture reduces EMI and eliminates the output filter,

reducing external component count, board area consump-

tion, system cost, and simplifying design.

Efficiency at 3.6V, 400mW into 8Ω speaker 89% (typ)

Efficiency at 3.6V, 100mW into 8Ω speaker 80% (typ)

Efficiency at 5V, 1W into 8Ω speaker

Quiescent current, 3.6V supply

Total shutdown power supply current

Single supply range

89% (typ)

2.2mA (typ)

0.01µA (typ)

2.4V to 5.5V

82dB

The LM4675 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 4Ω

speaker load at a continuous average output of 2.2W with

less than 1% THD+N. Its flexible power supply requirements

allow operation from 2.4V to 5.5V. The wide band spread

spectrum architecture of the LM4675 reduces EMI-radiated

emissions due to the modulator frequency.

PSRR, f = 217Hz

Features

n Spread spectrum architecture reduces EMI

n Mono Class D Operation

The LM4675 has high efficiency with speaker loads com-

pared to a typical Class AB amplifier. With a 3.6V supply

driving an 8Ω speaker, the IC’s efficiency for a 100mW

power level is 80%, reaching 89% at 400mW output power.

n No output filter required for inductive loads

n Externally configurable gain

n Very fast turn on time: 17µs (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

The LM4675 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 LM4675 is externally configurable which

allows independent gain control from multiple sources by

summing the signals. Output short circuit and thermal over-

load protection prevent the device from damage during fault

conditions.

n Available in space-saving 0.5mm pitch micro SMD and

LLP packages

Applications

n Mobile phones

n PDAs

n Portable electronic devices

20182721

LM4675 Rf Emissions — 6in cable

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201827

www.national.com

12 3 4 5 6 7...19

中文翻译

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与LM4675相关器件

型号	品牌	获取价格	描述	数据表
LM4675SD	NSC	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675SD/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| NGQ \|
LM4675SDBD	TI	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675SDX	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,LLCC,8PIN,PLASTIC
LM4675SDX/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| NGQ \|
LM4675TL	NSC	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675TL/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| YZR \|
LM4675TLBD	TI	获取价格	Ultra-Low EMI, Filterless, 2.65W, Mono, Class D Audio Power Amplifier with Spread Spectrum
LM4675TLX	NSC	获取价格	暂无描述
LM4675TLX/NOPB	TI	获取价格	具有超低 EMI 扩频的 2.65W 单声道、模拟输入 D 类扬声器放大器 \| YZR \|

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