LM4733 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – 3 Channel 30W Audio Power Amplifier with Mute

September 2003
LM4733
3 Channel 30W Audio Power Amplifier with Mute
General Description
The LM4733 is a three channel audio amplifier capable of
typically delivering 30W per channel of continuous average
output power into a 4Ω or 8Ω load with less than 10%
THD+N from 20Hz - 20kHz.
The LM4733 has short circuit protection and a thermal shut
down feature that is activated when the die temperature
exceeds 150˚C. The LM4733 also has an under voltage lock
out feature for click and pop free power on and off.
Each amplifier of the LM4733 has an independent smooth
transition fade-in/out mute.
The LM4733 has a wide operating supply range from ±10V
- ±32V allowing for lower cost unregulated power supplies to
be used.
The LM4733 amplifiers can easily be configured for bridge or
parallel operation for higher power and bi-amp solutions
Key Specifications
j Output Power/Channel at 10% THD+N,
1kHz into 4Ω or 8Ω
j THD+N at 3 x 1W into 8Ω, 1kHz
j Mute Attenuation
j PSRR
j Slew Rate
30W (typ)
0.03% (typ)
110dB (typ)
85dB (typ)
9V/µs (typ)
Features
n Low external component count
n Quiet fade-in/out mute mode
n Wide supply range: 20V - 64V
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
200794B5
FIGURE 1. Typical Audio Amplifier Application Circuit
© 2003 National Semiconductor Corporation DS200794
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