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PDF LM2878 Data sheet ( Hoja de datos )
| Número de pieza | LM2878 | |
| Descripción | LM2878 Dual 5 Watt Power Audio Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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December 1994
LM2878 Dual 5 Watt Power Audio Amplifier
General Description
The LM2878 is a high voltage stereo power amplifier de-
signed to deliver 5W channel continuous into 8X loads The
amplifier is ideal for use with low regulation power supplies
due to the absolute maximum rating of 35V and its superior
power supply rejection The LM2878 is designed to operate
with a low number of external components and still provide
flexibility for use in stereo phonographs tape recorders and
AM-FM stereo receivers The flexibility of the LM2878 al-
lows it to be used as a power operational amplifier power
comparator or servo amplifier The LM2878 is internally
compensated for all gains greater than 10 and comes in an
11-lead single-in-line package (SIP) The package has been
redesigned resulting in the slightly degraded thermal char-
acteristics shown in the figure Device Dissipation vs Ambi-
ent Temperature
Features
Y Wide operating range 6V – 32V
Y 5W channel output
Y 60 dB ripple rejection output referred
Y 70 dB channel separation output referred
Y Low crossover distortion
Y AC short circuit protected
Y Internal thermal shutdown
Applications
Y Stereo phonographs
Y AM-FM radio receivers
Y Power op amp power comparator
Y Servo amplifiers
Typical Applications
Frequency Response
of Bass Tone Control
TL H 7934 – 2
TL H 7934 – 1
FIGURE 1 Stereo Phonograph Amplifier with Bass Tone Control
C1995 National Semiconductor Corporation TL H 7934
RRD-B30M115 Printed in U S A
1 page  
Connection Diagram
Single-In-Line Package
Application Hints
The LM2878 is an improved LM378 in typical audio applica-
tions In the LM2878 the internal voltage regulator for the
input stage is generated from the voltage on pin 1 Normally
the input common-mode range is within g0 7V of this pin 1
voltage Nevertheless the common-mode range can be in-
creased by externally forcing the voltage on pin 1 One way
to do this is to short pin 1 to the positive supply pin 11
The only special care required with the LM2878 is to limit
the maximum input differential voltage to g7V If this differ-
ential voltage is exceeded the input characteristics may
change
Figure 2 shows a power op amp application with AV e 1
The 100k and 10k resistors set a noise gain of 10 and are
dictated by amplifier stability The 10k resistor is boot-
strapped by the feedback so the input resistance is domi-
nated by the 1 MX resistor
Top View
Pin 6 must be connected to GND
Order Number LM2878P
See NS Package Number P11A
TL H 7934 – 5
TL H 7934 – 6
FIGURE 2 Operational Power Amplifier AV e 1
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM2878.PDF ] | |
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