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LM831 Datasheet

LM831 Low Voltage Audio Power Amplifier

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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 Low voltage operation 1 8V to 6 0V
Y High power 440 mW 8X BTL 3V
Y Low AM radiation
Y Low noise
Y Low THD
Applications
Y Portable tape recorders
Y Portable radios
Y Headphone stereo
Y Portable speakers
Typical Application
Dual Amplifier with Minimum Parts
AVe46 dB BWe250 Hz to 35 kHz
POUT e 220 mW Ch RL e 4X
C1995 National Semiconductor Corporation TL H 6754
TL H 6754 – 1
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

LM831 Datasheet

LM831 Low Voltage Audio Power Amplifier

No Preview Available !

Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage VS
Input Voltage VIN
Power Dissipation (Note 1) PD
Operating Temperature (Note 1) Topr
7 5V
g0 4V
1 3W (M Package)
1 4W (N Package)
b40 C to a85 C
Storage Temperature Tstg
Junction Temperature Tj
Lead Temp (Soldering 10 sec ) TL
Thermal Resistance
iJC (DIP)
iJA (DIP)
iJC (SO Package)
iJA (SO Package)
b65 C to a150 C
a150 C
a260 C
27 C W
75 C W
20 C W
95 C W
Electrical Characteristics
Unless otherwise specified TA e 25 C VS e 3V f e 1 kHz test circuit is dual or BTL amplifier with minimum parts
Symbol
Parameter
Conditions
Typ Tested Limit Unit (Limit)
VS Operating Voltage
3 18
36
V(Min)
V(Max)
IQ
Supply Current
VIN e 0 Dual Mode
VIN e 0 BTL Mode
VOS
Output DC Offset
VIN e 0 BTL Mode
RIN Input Resistance
5 10 mA (Max)
6 15 mA (Max)
10 50 mV (Max)
25 15
35
k (Min)
k (Max)
AV Voltage Gain
VIN e 2 25 mVrms f e 1 kHz
Dual Mode
46 44
48
dB (Min)
dB (Max)
PSRR
POD
Supply Rejection
Power Out
VS e 3V a 200 mVrms
VS e 3V RL e 4X
10% THD Dual Mode
f e 1 kHz
46
220
30
150
dB (Min)
mW (Min)
PODL
Power Out Low VS
VS e 1 8V RL e 4X
10% THD Dual Mode
45 10 mW (Min)
POB Power Out
VS e 3V RL e 8X
10% THD BTL Mode
440 300
mW (Min)
POBL
Power Out Low VS
VS e 1 8V RL e 8X
10% THD BTL Mode
90 20 mW (Min)
Sep
IB
En0
THD
Channel Separation
Input Bias Current
Output Noise
Distortion
Referenced to VO e 200 mVrms
Wide Band (250 E 35 kHz)
VS e 3V PO e 50 mW
f e 1 kHz Dual
52
1
250
0 25
40
2
500
1
dB (Min)
mA (Max)
mV (Max)
% (Max)
Note 1 For operation in ambient temperatures above 25 C the device must be derated based on a 150 C maximum junction temperature and a thermal resistance
of 98 C W junction to ambient for the M package or 90 C W junction to ambient for the N package
Connection Diagram
Dual-In-Line Package
Top View
Order Number LM831M or N
See NS Package Number M16B or N16E
2
TL H 6754 – 2


Part Number LM831
Description LM831 Low Voltage Audio Power Amplifier
Maker National Semiconductor
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