LM4780 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – Audio Power Amplifier Series Stereo 60W, Mono 120W Audio Power Amplifier with Mute

July 2003
LM4780 Overture^™ Audio Power Amplifier Series
Stereo 60W, Mono 120W Audio Power Amplifier with
Mute
General Description
The LM4780 is a stereo audio amplifier capable of typically
delivering 60W per channel of continuous average output
power into an 8Ω load with less than 0.5% THD+N from
20Hz - 20kHz.
The LM4780 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
LM4780’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 LM4780 places it in a class above discrete
and hybrid amplifiers.
Each amplifier of the LM4780 has an independent smooth
transition fade-in/out mute.
The LM4780 can easily be configured for bridge or parallel
operation for 120W mono solutions.
Key Specifications
n Output Power/Channel with 0.5% THD+N, 1kHz into
8Ω
60W (typ)
n THD+N at 2 x 30W into 8Ω (20Hz - 20kHz) 0.03% (typ)
n THD+N at 2 x 30W into 6Ω (20Hz - 20kHz) 0.05% (typ)
n THD+N at 2 x 30W into 4Ω (20Hz - 20kHz) 0.07% (typ)
n Mute Attenuation
110dB (typ)
n PSRR
85dB (min)
n Slew Rate
19V/µs (typ)
Features
n SPiKe Protection
n Low external component count
n Quiet fade-in/out mute mode
n Wide supply range: 20V - 84V
n Signal-to-Noise Ratio ≥ 97dB (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
20058622
FIGURE 1. Typical Audio Amplifier Application Circuit
SPiKe™ Protection and Overture™ are trademarks of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200586
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