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PDF LM831M Data sheet ( Hoja de datos )
| Número de pieza | LM831M | |
| Descripción | LM831 Low Voltage Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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
1 page  
Typical Performance Characteristics (Continued)
Dual Mode RL e 4X Distortion vs Frequency
Dual Mode RL e 8X Distortion vs Frequency
Distortion vs Power Output (Note 2)
Distortion vs Power Output (Note 2)
Power Dissipation vs Power Output
Power Dissipation vs Power Output
TL H 6754 – 6
5
5 Page 
External Components (Refer to External Component Diagram)
Component
CO
Cc
Comments
Required to stabilize output stage
Output coupling capacitors for Dual Mode Sets a low-frequency pole in
the frequency response
1
fL e 2qCcRL
CBS Bootstrap capacitors Sets a low-frequency pole in the power BW
Recommended value is
1
CBS e 102qfLRL
CS
CBY
CNF
CBTL
Supply bypass Larger values improve low-battery performance by
reducing supply ripple
Filters the supply for improved low-voltage operation Also sets
turn-on delay
Sets a low-frequency response Also affects turn-on delay
1
fL e 2qCNF(RAV a 80)
In BTL Mode CNF on Pin 15 can be reduced without affecting the
frequency response However the turn-on ‘‘POP‘‘ will be worsened
Used only in the Bridge Mode Connects the output of the first amplifier to
the inverting input of the other through an internal resistor Sets a low-
frequency pole in one-half the frequency response
1
fL e 2qCBTL16k
CBW
Improves clipping waveform and sets the high-frequency bandwidth
Works with an internal 16k resistor (This equation applies for RAV i 0
For 46 dB application see BW – CBW curve )
1
fH e 2qCBW16k
RAV Used to reduce the gain and improve the distortion and signal to noise If
this is desired CBW must also be used
Min
0 33 mF
100 mF
Max
1 mF
10 000 mF
22 mF or
(short Pins
4 12 to 9)
470 mF
47 mF
47 mF
10 mF
10 000 mF
470 mF
100 mF
0 1 mF
1 mF
See table below
See table below
Typical AV
46 dB
40 dB
34 dB
28 dB
RAV
Short
82
240
560
Min
Open
100 pF
270 pF
500 pF
CBW
Max
4700 pF
4700 pF
4700 pF
4700 pF
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM831M.PDF ] | |
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