LM4782_06 Datasheet, PDF (1/27 Pages) National Semiconductor (TI) – Overture Audio Power Amplifier Series 3 Channel 25W Audio Power Amplifier with Mute and Standby

March 2006
LM4782 Overture^™ Audio Power Amplifier Series
3 Channel 25W Audio Power Amplifier with Mute and
Standby
General Description
The LM4782 is a three channel audio amplifier capable of
typically delivering 25W per channel of continuous average
output power into an 8Ω load with less than 0.5% THD+N
from 20Hz - 20kHz.
The LM4782 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
LM4782’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 LM4782 places it in a class above discrete
and hybrid amplifiers.
Each amplifier of the LM4782 has an independent smooth
transition fade-in/out mute and a power conserving standby
mode. The mute and standby modes can be controlled by
external logic.
The LM4782 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 8Ω
25W (typ)
j THD+N at 3x15W into 8Ω (20Hz - 20kHz) 0.2% (typ)
j THD+N at 3x15W into 6Ω (20Hz - 20kHz) 0.3% (typ)
j THD+N at 3x15W into 4Ω (20Hz - 20kHz) 0.4% (typ)
j Mute Attenuation
115dB (typ)
j PSRR
85dB (min)
j Slew Rate
18V/µs (typ)
Features
n SPiKe Protection
n Low external component count
n Quiet fade-in/out mute mode
n Low power standby mode
n Wide supply range: 20V - 64V
n Signal-to-Noise Ratio ≥ 98dB (ref. to P_O = 1W)
Applications
n Audio amplifier for component stereo
n Audio amplifier for compact stereo
n Audio amplifier for home theater in a box (HTB)
n Audio amplifier for self-powered speakers
n Audio amplifier for high-end and HD TVs
Typical Application
200811D2
FIGURE 1. Typical Audio Amplifier Application Circuit
SPiKe™ Protection and Overture™ are trademarks of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS200811
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