LM4730 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Stereo 14W Audio Power Amplifier with Mute and Standby Modes

July 2003
LM4730
Stereo 14W Audio Power Amplifier with Mute and
Standby Modes
General Description
The LM4730 is a stereo audio amplifier capable of delivering
typically 14W per channel of continuous average output
power into a 4Ω 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 LM4730 has short circuit protection and a thermal shut
down feature that is activated when the die temperature
exceeds 150˚C. The LM4730 also has a under voltage lock
out feature for click and pop free power off and on.
The LM4730 has a wide operating supply range from +/-10V
- +/-25V allowing for lower cost unregulated power supplies
to be used.
Key Specifications
n Output power into 4Ω or 8Ω, 10% THD+N 14W (typ)
n THD+N at 1kHz with 2 X 1W into 8Ω
0.02% (typ)
n Mute Attenuation
85dB (typ)
n PSRR with f_RIPPLE = 120Hz, V_RIPPLE = 1V_RMS50dB (typ)
n Slew Rate
18V/µs (typ)
n Standby Current (+/-17V)
3.5mA (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 (Note 12)
TO-220 Top Marking (Note 12)
Top View
Non-Isolated Package
Order Number LM4730TA
See NS Package Number TA15A
20059452
20059474
Top View
U - Wafer Fab Code
Z - Assembly Plant Code
XY - Date Code
TT - Die Traceability
LM4730TA - LM4730TA
© 2003 National Semiconductor Corporation DS200594
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