LM4680

10W High-Efficiency Mono BTL Audio Power Amplifier

General Description

The LM4680 is a high efficiency switching audio power

amplifier primarily designed for demanding applications in

flat panel monitors and TV’s. It is capable of delivering 10W

to an 8

Ω mono BTL load with less than 10% distortion

(THD+N) when powered from a 14V

Boomer audio power amplifiers were designed specifically to

provide high quality output power with a minimal amount of

external components. The LM4680 features a micro-power,

active-low shutdown mode, an internal thermal shutdown

protection mechanism, output fault detect, and short circuit

protection.

The LM4680 contains advanced transient (“pop and click”)

suppression circuitry that eliminates noises that would oth-

erwise occur during turn-on and turn-off transitions.

Key Specifications

f

R

Ω)

10W (typ)

25mA (typ)

R

Ω,P

81% (typ)

0.1mA (typ)

30dB (typ)

Features

n

Soft-start circuitry eliminates noise during turn-on

transition

n

Low current shutdown mode

n

Low quiescent current

n

6W BTL output, R

Ω, THD+N = 1%

n

Short circuit protection

n

Fixed, internally set gain of 30dB

n

Internal clamp diodes protect amplifier outputs

Applications

n

Flat Panel Monitors

n

Flat Panel TVs

n

Computer Sound Cards

Connection Diagram

Plastic Package

20095802

Top View

Order Number LM4680SD

See NS Package Number SRC14A

January 2005

© 2005 National Semiconductor Corporation

DS200958

www.national.com