LM831 Low Voltage Audio Power Amplifier
December 1994
LM831 Low Voltage Audio Power Amplifier
General Description
The LM831 is a dual audio power amplifier optimized for
very low voltage operation The LM831 has two indepen-
dent amplifiers giving stereo or higher power bridge (BTL)
operation from two- or three-cell power supplies
The LM831 uses a patented compensation technique to re-
duce high-frequency radiation for optimum performance in
AM radio applications This compensation also results in
lower distortion and less wide-band noise
The input is direct-coupled to the LM831 eliminating the
usual coupling capacitor Voltage gain is adjustable with a
single resistor
Features
Y
Y
Y
Y
Y
Low voltage operation 1 8V to 6 0V
High power 440 mW 8X BTL 3V
Low AM radiation
Low noise
Low THD
Applications
Y
Y
Y
Y
Portable tape recorders
Portable radios
Headphone stereo
Portable speakers
Typical Application
Dual Amplifier with Minimum Parts
TL H 6754 鈥?1
A
V
e
46 dB BW
e
250 Hz to 35 kHz
P
OUT
e
220 mW Ch R
L
e
4X
C
1995 National Semiconductor Corporation
TL H 6754
RRD-B30M115 Printed in U S A