LM4940

更新时间： 2024-11-24 23:16:47

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
14页	1039K
描述
6W Streo Audio Power Amplifier

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LM4940 数据手册

April 2005

LM4940

6W Stereo Audio Power Amplifier

General Description

Key Specifications

The LM4940 is a dual audio power amplifier primarily de-

signed for demanding applications in flat panel monitors and

TV’s. It is capable of delivering 6 watts per channel to a 4Ω

load with less than 10% THD+N while operating on a

14.4V_DCpower supply.

Quiscent Power Supply Current

40mA (max)

P_OUT(SE)

V_DD= 14.4V, R_L= 4Ω, 10% THD+N

Shutdown current

6W (typ)

40µA (typ)

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4940 does not require boot-

strap capacitors or snubber circuits. Therefore, it is ideally

suited for display applications requiring high power and mini-

mal size.

Features

n Pop & click circuitry eliminates noise during turn-on and

turn-off transitions

n Low current, active-low shutdown mode

n Low quiescent current

n Stereo 6W output, R_L= 4Ω

n Short circuit protection

n Unity-gain stable

n External gain configuration capability

The LM4940 features a low-power consumption active-low

shutdown mode. Additionally, the LM4940 features an inter-

nal thermal shutdown protection mechanism along with short

circuit protection.

The LM4940 contains advanced pop & click circuitry that

eliminates noises which would otherwise occur during

turn-on and turn-off transitions.

Applications

n Flat Panel Monitors

n Flat Panel TV’s

The LM4940 is a unity-gain stable and can be configured by

external gain-setting resistors.

n Computer Sound Cards

Typical Application

20075672

FIGURE 1. Typical Stereo Audio Amplifier Application Circuit

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

DS200756

www.national.com

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