LM831N National Semiconductor, LM831N Datasheet - Page 9

• Manufacturer Part Number: LM831N
• Description: Audio Amp Speaker 1-CH Mono/2-CH Stereo 0.44W Class-AB 16-Pin MDIP Rail
• Manufacturer: National Semiconductor

Specifications of LM831N

• Package: 16MDIP
• Function: Speaker
• Amplifier Type: Class-AB
• Typical Voltage Gain: 48 dB
• Total Harmonic Distortion Noise: 0.25@50mW %
• Typical Psrr: 46 dB
• Output Signal Type: Differential|Single
• Output Type: 1-Channel Mono|2-Channel Stereo
• Maximum Input Bias Current: 2@3V uA
• Maximum Load Resistance: 8 Ohm

LM831 Circuit Description
The power supply is applied to Pin 9 and is filtered by resis-
tor R
Pin 16 is used to bias all of the LM831 circuits except the
power output stage Resistor R
that sets the output DC voltage for optimum output power
for any given supply voltage
Feedback is provided to the input transistor Q
R
6
and R
1
and capacitor C
7
BY
on Pin 16 This filtered voltage at
0
generates a biasing current
Refer to the external component diagram and equivalent schematic
1
External Component Diagram
emitter by
9
The capacitor C
mum DC accuracy
Q
the output load from Q
Bootstrapping of Pin 5 by C
swing and improved supply rejection
R
2
5
is provided for bridge (BTL) operation
provides voltage gain and the rest of the devices buffer
NF
on Pin 2 provides unity DC gain for maxi-
2
’s collector
BS
allows maximum output
TL H 6754 – 12