LM4781, LM4781TABD

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SNAS208A – AUGUST 2003 – REVISED APRIL 2013

LM4781 Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier

with Mute

Check for Samples: LM4781, LM4781TABD

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FEATURES

DESCRIPTION

The LM4781 is a three channel audio amplifier

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•

SPiKe Protection

capable of typically delivering 35W per channel of

•

Low External Component Count

continuous average output power into an 8

Ω load

•

Quiet Fade-In/Out Mute Mode

with less than 0.5% THD+N from 20Hz - 20kHz.

•

Wide Supply Range: 20V - 70V

The LM4781 is fully protected utilizing TI's Self Peak

•

Signal-to-Noise Ratio

Instantaneous Temperature (°Ke) (SPiKe) protection

circuitry. SPiKe provides a dynamically optimized

Safe

Operating

Area

(SOA).

SPiKe

protection

APPLICATIONS

completely safeguards the LM4781's outputs against

•

Audio Amplifier for Component Stereo

over-voltage, under-voltage, overloads, shorts to the

•

Audio Amplifier for Compact Stereo

supplies or GND, thermal runaway and instantaneous

temperature peaks. The advanced protection features

•

Audio Amplifier for Self-Powered Speakers

of the LM4781 places it in a class above discrete and

•

Audio Amplifier for High-End and HD TVs

hybrid amplifiers.

Each amplifier of the LM4781 has an independent

KEY SPECIFICATIONS

smooth transition fade-in/out mute.

•

Output Power/Channel with 0.5% THD+N, 1kHz

The LM4781 can easily be configured for bridge or

into 8

Ω: 35W (typ)

parallel operation for higher power and bi-amp

•

THD+N at 3 x 20W into 8

Ω (20Hz - 20kHz): 0.2%

solutions.

(typ)

•

THD+N at 3 x 20W into 6

Ω (20Hz - 20kHz): 0.3%

(typ)

•

THD+N at 3 x 20W into 4

Ω (20Hz - 20kHz): 0.5%

(typ)

•

Mute Attenuation: 110dB (typ)

•

PSRR: 85dB (min)

•

Slew Rate: 9V/

μs (typ)

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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.

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Overture is a trademark of dcl_owner.

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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.