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PDF LM1896N Data sheet ( Hoja de datos )

Número de pieza LM1896N
Descripción LM1896/LM2896 Dual Audio Power Amplifier
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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February 1995
LM1896 LM2896 Dual Audio Power Amplifier
General Description
The LM1896 is a high performance 6V stereo power amplifi-
er designed to deliver 1 watt channel into 4X or 2 watts
bridged monaural into 8X Utilizing a unique patented com-
pensation scheme the LM1896 is ideal for sensitive AM
radio applications This new circuit technique exhibits lower
wideband noise lower distortion and less AM radiation than
conventional designs The amplifier’s wide supply range
(3V – 9V) is ideal for battery operation For higher supplies
(VS l 9V) the LM2896 is available in an 11-lead single-in-
line package The LM2896 package has been redesigned
resulting in the slightly degraded thermal characteristics
shown in the figure Device Dissipation vs Ambient Tempera-
ture
Features
Y Low AM radiation
Y Low noise
Y 3V 4X stereo Po e 250 mW
Y Wide supply operation 3V – 15V (LM2896)
Y Low distortion
Y No turn on ‘‘pop’’
Y Adjustable voltage gain and bandwidth
Y Smooth waveform clipping
Y Po e 9W bridged LM2896
Applications
Y Compact AM-FM radios
Y Stereo tape recorders and players
Y High power portable stereos
Typical Applications
TL H 7920 – 1
FIGURE 1 LM2896 in Bridge Configuration (AV e 400 BW e 20 kHz)
Order Number LM1896N Order Number LM2896P
See NS Package Number N14A See NS Package Number P11A
C1995 National Semiconductor Corporation TL H 7920
RRD-B30M115 Printed in U S A

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LM1896N pdf
Typical Applications (Continued)
6 9 No connection on LM1896
( ) Indicates pin number for LM2896
TL H 7920 – 7
FIGURE 2 Stereo Amplifier with AV e 200 BW e 30 kHz
TL H 7920 – 8
External Components (Figure 2)
Components
1 R2 R5 R10 R13
2 R3 R12
3 Ro
4 C1 C14
5 C2 C13
6 C3 C12
7 C5 C10
8 C7
9 Cc
10 Co
11 CS
Comments
Sets voltage gain AV e 1 a R5 R2 for one channel and AV e 1 a R10 R13
for the other channel
Bootstrap resistor sets drive current for output stage and allows pins 3 and 12 to
go above VS
Works with Co to stabilize output stage
Input coupling capacitor Pins 1 and 14 are at a DC potential of VS 2 Low
frequency pole set by
1
fL e 2q RIN C1
Feedback capacitors Ensure unity gain at DC Also a low frequency pole at
1
fL e 2qR2C2
Bootstrap capacitors used to increase drive to output stage A low frequency
pole is set by
1
fL e 2qR3C3
Compensation capacitor These stabilize the amplifiers and adjust their
bandwidth See curve of bandwidth vs allowable gain
Improves power supply rejection (See Typical Performance Curves) Increasing
C7 increases turn-on delay
Output coupling capacitor Isolates pins 5 and 10 from the load Low frequency
pole set by
1
fL e 2q CcRL
Works with Ro to stabilize output stage
Provides power supply filtering
5

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