LM4781_14 Datasheet, PDF (1/31 Pages) Texas Instruments – Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute

LM4781, LM4781TABD
www.ti.com
SNAS208 – MAY 2004
LM4781 Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier
with Mute
Check for Samples: LM4781, LM4781TABD
FEATURES
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•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
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 National's Self Peak Instantaneous Temperature (°Ke) (SPiKe^TM)
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.
Table 1. Key Specifications
■ Output Power/Channel with 0.5% THD+N,
1kHz into 8Ω
■ THD+N at 3 x 20W into 8Ω (20Hz - 20kHz)
■ THD+N at 3 x 20W into 6Ω (20Hz - 20kHz)
■ THD+N at 3 x 20W into 4Ω (20Hz - 20kHz)
■ Mute Attenuation
■ PSRR
■ Slew Rate
VALUE
35
0.2% (typ)
0.3% (typ)
0.5% (typ)
110
85
9V/µs (typ)
UNIT
W (typ)
dB (typ)
dB (min)
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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.
Overture is a trademark of dcl_owner.
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All other trademarks are the property of their respective owners.
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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 © 2004, Texas Instruments Incorporated