LM831M National Semiconductor, LM831M Datasheet - Page 9

• Manufacturer Part Number: LM831M
• Description: IC AMP AUDIO PWR .44W AB 16SOIC
• Manufacturer: National Semiconductor
• Type: Class ABr

Specifications of LM831M

• Output Type: 1-Channel (Mono) or 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 440mW x 1 @ 8 Ohm; 220mW x 2 @ 4 Ohm
• Voltage - Supply: 1.8 V ~ 6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Other names: *LM831M

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