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LM4731 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4731
Description  Stereo 25W Audio Power Amplifier with Mute and Standby Modes
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4731 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LM4731
Stereo 25W Audio Power Amplifier with Mute and
Standby Modes
General Description
The LM4731 is a stereo audio amplifier capable of delivering
typically 25W per channel of continuous average output
power into a 4
Ω or 8Ω load with less than 10% THD+N from
20Hz - 20kHz.
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 LM4731 has short circuit protection and a thermal shut
down feature that is activated when the die temperature
exceeds 150˚C. The LM4731 also has a under voltage lock
out feature for click and pop free power off and on.
The LM4731 has a wide operating supply range from +/-10V
- +/-28V allowing for lower cost unregulated power supplies
to be used.
Key Specifications
j Output Power into 4
Ω or 8Ω, 10% THD+N 25W (typ)
j THD+N at 1kHz with2x1W into 8
0.02% (typ)
j Mute Attenuation
85dB (typ)
j PSRR with fRIPPLE = 120Hz,
V
RIPPLE =1VRMS
50dB (typ)
j Slew Rate
18V/µs (typ)
j Standby Current (+/-22V)
4.8mA (typ)
Features
n
Minimal amount of external components necessary
n
Quiet fade-in/out mute mode
n
Low current Standby-mode
Applications
n
Audio amplifier for high-end stereo TVs
n
Audio amplifier for component stereo
n
Audio amplifier for compact stereo
n
Audio amplifier for PC satellite speaker systems
n
Audio amplifier for self powered speakers
Connection Diagrams
Plastic Package
TO-220 Top Marking (Note 12)
20060352
Top View
Non-Isolated Package
Order Number LM4731TA
See NS Package Number TA15A
20060375
Top View
U - Wafer Fab Code
Z - Assembly Plant Code
XY - Date Code
TT - Die Traceability
LM4731TA - LM4731TA
July 2003
© 2003 National Semiconductor Corporation
DS200603
www.national.com


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