LM4732 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Stereo 50W Audio Power Amplifier with Mute

July 2003
LM4732
Stereo 50W Audio Power Amplifier with Mute
General Description
The LM4732 is a stereo audio amplifier capable of typically
delivering 50W per channel of continuous average output
power into a 4Ω or 8Ω load with less than 10% THD+N from
20Hz - 20kHz.
The LM4732 has short circuit protection and a thermal shut
down feature that is activated when the die temperature
exceeds 150˚C. The LM4732 also has an under voltage lock
out feature for click and pop free power on and off.
Each amplifier of the LM4732 has an independent smooth
transition fade-in/out mute.
The LM4732 has a wide operating supply range from +/-10V
- +/-40V allowing for lower cost unregulated power supplies
to be used.
The LM4732 amplifiers can easily be configured for bridge or
parallel operation for 100W mono solutions.
Key Specifications
j Output Power/Channel at 10% THD+N,
1kHz into 4Ω or 8Ω
j THD+N at 2 x 1W into 8Ω, 1kHz
j Mute Attenuation
j PSRR
j Slew Rate
50W (typ)
0.01% (typ)
110dB (typ)
89dB (typ)
19V/µs (typ)
Features
n Low external component count
n Quiet fade-in/out mute mode
n Wide supply range: 20V - 80V
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
20072422
FIGURE 1. Typical Audio Amplifier Application Circuit
© 2003 National Semiconductor Corporation DS200724
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