LM4781 Datasheet, PDF (1/31 Pages) National Semiconductor (TI) – Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute

LM4781, LM4781TABD
www.ti.com
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
FEATURES
1
•23 SPiKe Protection
• Low External Component Count
• Quiet Fade-In/Out Mute Mode
• Wide Supply Range: 20V - 70V
• Signal-to-Noise Ratio ≥ 93dB (ref. to P_O = 1W)
APPLICATIONS
• Audio Amplifier for Component Stereo
• Audio Amplifier for Compact Stereo
• Audio Amplifier for Self-Powered Speakers
• Audio Amplifier for High-End and HD TVs
KEY SPECIFICATIONS
• Output Power/Channel with 0.5% THD+N, 1kHz
into 8Ω: 35W (typ)
• THD+N at 3 x 20W into 8Ω (20Hz - 20kHz): 0.2%
(typ)
• THD+N at 3 x 20W into 6Ω (20Hz - 20kHz): 0.3%
(typ)
• THD+N at 3 x 20W into 4Ω (20Hz - 20kHz): 0.5%
(typ)
• Mute Attenuation: 110dB (typ)
• PSRR: 85dB (min)
• Slew Rate: 9V/μs (typ)
DESCRIPTION
The LM4781 is a three channel audio amplifier
capable of typically delivering 35W per channel of
continuous average output power into an 8Ω load
with less than 0.5% THD+N from 20Hz - 20kHz.
The LM4781 is fully protected utilizing TI's Self Peak
Instantaneous Temperature (°Ke) (SPiKe) protection
circuitry. SPiKe provides a dynamically optimized
Safe Operating Area (SOA). SPiKe protection
completely safeguards the LM4781's outputs against
over-voltage, under-voltage, overloads, shorts to the
supplies or GND, thermal runaway and instantaneous
temperature peaks. The advanced protection features
of the LM4781 places it in a class above discrete and
hybrid amplifiers.
Each amplifier of the LM4781 has an independent
smooth transition fade-in/out mute.
The LM4781 can easily be configured for bridge or
parallel operation for higher power and bi-amp
solutions.
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.
Overture is a trademark of dcl_owner.
2
All other trademarks are the property of their respective owners.
3
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2013, Texas Instruments Incorporated