LM4940

www.ti.com

SNAS219C – OCTOBER 2003 – REVISED MAY 2013

LM4940

6W Stereo Audio Power Amplifier

Check for Samples: LM4940

1

FEATURES

DESCRIPTION

The LM4940 is a dual audio power amplifier primarily

23

•

Click and Pop Circuitry Eliminates Noise

designed for demanding applications in flat panel

During Turn-On and Turn-Off Transitions

monitors and TVs. It is capable of delivering 6 watts

•

Low Current, Active-Low Shutdown Mode

per channel to a 4

Ω load with less than 10% THD+N

•

Low Quiescent Current

while operating on a 14.4VDC power supply.

•

Stereo 6W Output, RL = 4Ω

Boomer™ audio power amplifiers were designed

specifically to provide high quality output power with a

•

Short Circuit Protection

minimal

amount

of

external

components.

The

•

Unity-Gain Stable

LM4940 does not require bootstrap capacitors or

•

External Gain Configuration Capability

snubber circuits. Therefore, it is ideally suited for

display applications requiring high power and minimal

APPLICATIONS

size.

•

Flat Panel Monitors

The LM4940 features a low-power consumption

active-low shutdown mode. Additionally, the LM4940

•

Flat Panel TVs

features an internal thermal shutdown protection

•

Computer Sound Cards

mechanism along with short circuit protection.

The LM4940 contains advanced pop and click

KEY SPECIFICATIONS

circuitry that eliminates noises which would otherwise

•

Quiscent Power Supply Current: 40mA (max)

occur during turn-on and turn-off transitions.

(SE)

The LM4940 is a unity-gain stable and can be

•

POUT

configured by external gain-setting resistors.

VDD = 14.4V, RL = 4Ω, 10% THD+N: 6 W (typ)

•

Shutdown Current: 40µA (typ)

TYPICAL APPLICATION

Figure 1. Typical Stereo Audio Amplifier Application Circuit

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

Boomer is a trademark of Texas Instruments, Inc.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2003–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.