LM4755_02 Datasheet, PDF (1/23 Pages) National Semiconductor (TI) – Stereo 11W Audio Power Amplifier with Mute

May 2002
LM4755
Stereo 11W Audio Power Amplifier with Mute
General Description
The LM4755 is a stereo audio amplifier capable of delivering
11W per channel of continuous average output power to a
4Ω load or 7W per channel into 8Ω using a single 24V supply
at 10% THD+N. The internal mute circuit and pre-set gain
resistors provide for a very economical design solution.
Output power specifications at both 20V and 24V supplies
and low external component count offer high value to con-
sumer electronic manufacturers for stereo TV and compact
stereo applications. The LM4755 is specifically designed for
single supply operation.
Key Specifications
n Output power at 10% THD with 1kHz into 4Ω at
V_CC = 24V: 11W (typ)
n Output power at 10% THD with 1kHz into 8Ω at
V_CC = 24V: 7W (typ)
n Closed loop gain: 34dB (typ)
n P_O at 10% THD+N @ 1kHz into 4Ω single-ended
TO-263 package at V_CC=12V: 2.5W (typ)
n P_O at 10% THD+N @ 1kHz into 8Ω bridged TO-263
package at V_CC=12V: 5W (typ)
Features
n Drives 4Ω and 8Ω loads
n Integrated mute function
n Internal Gain Resistors
n Minimal external components needed
n Single supply operation
n Internal current limiting and thermal protection
n Compact 9-lead TO-220 package
n Wide supply range 9V - 40V
Applications
n Stereos TVs
n Compact stereos
n Mini component stereos
Typical Application
10005901
FIGURE 1. Typical Audio Amplifier Application Circuit
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