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LM4781 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4781
Description  Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4781 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM4781 OvertureAudio Power Amplifier Series
3 Channel 35W Audio Power Amplifier with Mute
General Description
The LM4781 is a three channel audio amplifier capable of
typically delivering 35W per channel of continuous average
output power into an 8
Ω 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 cir-
cuitry. SPiKe provides a dynamically optimized Safe Operat-
ing Area (SOA). SPiKe protection completely safeguards the
LM4781’s outputs against over-voltage, under-voltage, over-
loads, 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.
Key Specifications
j Output Power/Channel with 0.5% THD+N,
1kHz into 8
35W (typ)
j THD+N at 3 x 20W into 8
Ω (20Hz - 20kHz) 0.2% (typ)
j THD+N at 3 x 20W into 6
Ω (20Hz - 20kHz) 0.3% (typ)
j THD+N at 3 x 20W into 4
Ω (20Hz - 20kHz) 0.5% (typ)
j Mute Attenuation
110dB (typ)
j PSRR
85dB (min)
j Slew Rate
9V/µs (typ)
Features
n
SPiKe Protection
n
Low external component count
n
Quiet fade-in/out mute mode
n
Wide supply range: 20V - 70V
n
Signal-to-Noise Ratio
≥ 93dB (ref. to P
O = 1W)
Applications
n
Audio amplifier for component stereo
n
Audio amplifier for compact stereo
n
Audio amplifier for self-powered speakers
n
Audio amplifier for high-end and HD TVs
Typical Application
SPiKeProtection and Overtureare trademarks of National Semiconductor Corporation.
200673B5
FIGURE 1. Typical Audio Amplifier Application Circuit
August 2003
© 2003 National Semiconductor Corporation
DS200673
www.national.com


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