LM4867 판매점 - Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function

LM4867 반도체 회로 부품 판매점

Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function

National Semiconductor

February 2001

LM4867

Output-Transient-Free Dual 2.1W Audio Amplifier Plus

No Coupling Capacitor Stereo Headphone Function

General Description

The LM4867 is a dual bridge-connected audio power ampli-

fier which, when connected to a 5V supply, will deliver 2.1W

to a 4Ω load (Note 1) or 2.4W to a 3Ω load (Note 2) with less

than 1.0% THD+N. The LM4867 uses advanced, latest gen-

eration circuitry to eliminate all traces of clicks and pops

when the supply voltage is first applied. The amplifier has a

headphone-amplifier-select input pin. It is used to switch the

amplifiers from bridge to single-ended mode for driving

headphones. A new circuit topology eliminates headphone

output coupling capacitors. A MUX control pin allows selec-

tion between the two sets of stereo input signals. The MUX

control can also be used to select between two different

customer-specified closed-loop responses.

Boomer audio power amplifiers are designed specifically to

provide high quality output power from a surface mount

package and require few external components. To simplify

audio system design, the LM4867 combines dual bridge

speaker amplifiers and stereo headphone amplifiers in one

package.

The LM4867 features an externally controlled power-saving

micropower shutdown mode, a stereo headphone amplifier

mode, and thermal shutdown protection.

Note 1: An LM4867LQ or LM4867MTE that has been properly mounted to

a circuit board will deliver 2.1W into 4Ω. The Mux control can also be used to

select two different closed-loop responses. LM4867MT will deliver 1.1W into

8Ω. See the Application Information sections for further information concern-

ing the LM4867LQ and the LM4867MT.

Note 2: An LM4867LQ or LM4867MTE that has been properly mounted to a

circuit board and forced-air cooled will deliver 2.4W into 3Ω.

Key Specifications

n PO at 1% THD+N

n LM4867LQ, 3Ω load

2.4W (typ)

n LM4867LQ, 4Ω load

2.1W (typ)

n LM4867MTE, 4Ω

1.9W (typ)

n LM4867MT, 8Ω

1.1W (typ)

n Single-ended mode - THD+N at 75mW into 32Ω 0.5%

(max)

n Shutdown current

0.7µA (typ)

Features

n Advanced “click and pop” suppression circuitry

n Eliminates headphone amplifier output coupling

capacitors

n Stereo headphone amplifier mode

n Input mux control and two separate inputs per channel

n Thermal shutdown protection circuitry

n LLP, TSSOP, and exposed-DAP TSSOP packaging

available

Applications

n Multimedia monitors

n Portable and desktop computers

n Portable audio systems

Typical Application

DS200013-31

* Refer to the Application Information section titled PROPER SELECTION OF EXTERNAL COMPONENTS for details concerning the value of CB.

FIGURE 1. Typical Audio Amplifier Application Circuit

(Pin out shown for the 24-pin Exposed-DAP LLP package. Numbers in ( ) are for the 20-pin MTE and MT

packages.)

Boomer® is a registered trademark of National Semiconductor Corporation.

www.national.com

Connection Diagram

DS200013-58

Top View

Order Number LM4867MT, LM4867MTE

See NS Package Number MTC20 for TSSOP

See NS Package Number MXA20A for Exposed-DAP TSSOP

Connection Diagram

DS200013-38

Top View

Order Number LM4867LQ

See NS Package Number LQA24A for Exposed-DAP LLP

www.national.com

PDF 파일 내의 페이지 : 총 26 페이지

제조업체: National Semiconductor

( national )

LM4867 amplifier

데이터시트 다운로드 :

[ LM4867.PDF ]

[ LM4867 다른 제조사 검색 ]

국내 전력반도체 판매점

상호 : 아이지 인터내셔날

전화번호 : 051-319-2877

[ 홈페이지 ]

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( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )

전력반도체 문의 : 010-3582-2743

일반적인 전자부품 판매점

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LM4867 반도체 회로 부품 판매점

Output-Transient-Free Dual 2.1W Audio Amplifier Plus No Coupling Capacitor Stereo Headphone Function

국내 전력반도체 판매점

일반적인 전자부품 판매점

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