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Audio Power Amplifier Series Dual 30W Audio Power
Amplifier with Mute and Standby Modes
General Description
The LM4765 is a stereo audio amplifier capable of delivering
typically 30W per channel of continuous average output
power into an 8鈩?load with less than 0.1% (THD + N).
Each amplifier has an independent smooth transition fade-in/
out mute and a power conserving standby mode which can
be controlled by external logic.
The performance of the LM4765, utilizing its Self Peak In-
stantaneous Temperature (藲Ke) (SPiKe
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) Protection Cir-
cuitry, places it in a class above discrete and hybrid amplifi-
ers by providing an inherently, dynamically protected Safe
Operating Area (SOA).
SPiKe
Protection means that these
parts are safeguarded at the output against overvoltage, un-
dervoltage, overloads, including thermal runaway and in-
stantaneous temperature peaks.
Key Specifications
j
j
j
THD+N at 1 kHz at 2 x 25W continuous average
output power into 8鈩?
THD+N at 1 kHz at continuous average
output power of 2 x 30W into 8鈩?
Standby current:
0.009% (typ)
6.5 mA (typ)
0.1% (max)
Features
n
n
n
n
n
SPiKe Protection
Minimal amount of external components necessary
Quiet fade-in/out mute mode
Standby-mode
Non-Isolated 15-lead TO-220 package
Applications
n
High-end stereo TVs
n
Component stereo
n
Compact stereo
Typical Application
Connection Diagram
Plastic Package
DS100927-2
DS100927-1
Top View
Non-Isolated Package
Order Number LM4765T
See NS Package Number TA15A
FIGURE 1. Typical Audio Amplifier Application Circuit
Note:
Numbers in parentheses represent pinout for amplifier B.
*
Optional component dependent upon specific design requirements.
SPiKe
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Protection and
Overture
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are trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS100927
www.national.com
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