LM1877
Dual Audio Power Amplifier
General Description
The LM1877 is a monolithic dual power amplifier designed to
deliver 2W/channel continuous into 8
loads. The LM1877 is
designed to operate with a low number of external compo-
nents, and still provide flexibility for use in stereo phono-
graphs, tape recorders and AM-FM stereo receivers, etc.
Each power amplifier is biased from a common internal regu-
lator to provide high power supply rejection, and output Q
point centering. The LM1877 is internally compensated for
all gains greater than 10.
Features
n
2W/channel
n
-65 dB ripple rejection, output referred
n
-65 dB channel separation, output referred
n
Wide supply range, 6V24V
n
Very low cross-over distortion
n
Low audio band noise
n
AC short circuit protected
n
Internal thermal shutdown
Applications
n
Multi-channel audio systems
n
Stereo phonographs
n
Tape recorders and players
n
AM-FM radio receivers
n
Servo amplifiers
n
Intercom systems
n
Automotive products
Connection Diagram
Dual-In-Line Package
or Surface Mount Package
DS007913-1
Top View
Order Number LM1877M-9 or LM1877N-9
See NS Package Number M14B or N14A
February 1995
LM1877
Dual
Audio
Power
Amplifier
1999 National Semiconductor Corporation
DS007913
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Equivalent Schematic Diagram
DS007913-2
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2
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
26V
Input Voltage
0.7V
Operating Temperature
0C to +70C
Storage Temperature
-65C to +150C
Junction Temperature
150C
Lead Temperature
N-Package Soldering (10 sec.)
260C
M-Package Infared (15 sec.)
220C
M-Package Vapor Phase (60 sec.)
215C
Thermal Resistance
JC
(N-Package)
30C/W
JA
(N-Package)
79C/W
JC
(M-Package)
27C/W
JA
(M-Package)
114C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Operating Ratings indicate conditions for which the de-
vice is functional, but do not guarantee specific performance limits.
Electrical Characteristics
V
S
= 20V, T
A
= 25C, (Note 2) R
L
= 8
, A
V
= 50 (34 dB) unless otherwise specified
Parameter
Conditions
Min
Typ
Max
Units
Total Supply Current
P
O
= 0W
25
50
mA
Output Power
THD = 10%
LM1877
V
S
= 20V, R
L
= 8
2.0
W/Ch
V
S
= 12V, R
L
= 8
1.3
W/Ch
Total Harmonic Distortion
LM1877
f = 1 kHz, V
S
= 14V
P
O
= 50 mW/Channel
0.075
%
P
O
= 500 mW/Channel
0.045
%
P
O
= 1 W/Channel
0.055
%
Output Swing
R
L
= 8
V
S
-6
Vp-p
Channel Separation
C
F
= 50 F, C
IN
= 0.1 F,
f = 1 kHz, Output Referred
V
S
= 20V, V
O
= 4 Vrms
-50
-70
dB
V
S
= 7V, V
O
= 0.5 Vrms
-60
dB
PSRR Power Supply
C
F
= 50 F, C
IN
= 0.1 F,
Rejection Ratio
f = 120 Hz, Output Referred
V
S
= 20V, V
RIPPLE
= 1 Vrms
-50
-65
dB
V
S
= 7V, V
RIPPLE
= 0.5 Vrms
-40
dB
Noise
Equivalent Input Noise
R
S
= 0, C
IN
= 0.1 F,
2.5
V
BW = 20 Hz20 kHz, Output Noise Wideband
R
S
= 0, C
N
= 0.1 F, A
V
200
0.80
mV
Open Loop Gain
R
S
= 0, f = 100 kHz, R
L
= 8
70
dB
Input Offset Voltage
15
mV
Input Bias Current
50
nA
Input Impedance
Open Loop
4
M
DC Output Level
V
S
= 20V
9
10
11
V
Slew Rate
2.0
V/s
Power Bandwidth
65
kHz
Current Limit
1.0
A
Note 2: For operation at ambient temperature greater than 25C, the LM1877 must be derated based on a maximum 150C junction temperature.
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3
Typical Performance Characteristics
Device Dissipation vs
Ambient Temperature
DS007913-10
Power Supply Rejection Ratio
(Referred to the Output) vs
Frequency
DS007913-11
Power Supply Rejection Ratio
(Referred to the Output) vs
Frequency
DS007913-12
Power Supply Rejection Ratio
(Referred to the Output) vs
Supply Voltage
DS007913-13
Channel Separation (Referred
to the Output) vs Frequency
DS007913-14
Channel Separation (Referred
to the Output) vs Frequency
DS007913-15
Average Supply Current vs
P
OUT
DS007913-16
Total Harmonic Distortion
vs Frequency
DS007913-17
Total Harmonic Distortion
vs Frequency
DS007913-18
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4
Typical Performance Characteristics
(Continued)
Typical Applications
Power Dissipation (W)
Both Channels Operating
DS007913-19
Open Loop Gain vs
Frequency
DS007913-20
Output Swing vs Supply
Voltage
DS007913-21
Stereo Phonograph Amplifier with Bass Tone Control
DS007913-4
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5
Typical Applications
(Continued)
Frequency Response of Bass Tone Control
DS007913-5
Inverting Unity Gain Amplifier
DS007913-6
Stereo Amplifier with A
V
= 200
DS007913-7
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6
Typical Applications
(Continued)
Non-Inverting Amplifier Using Split Supply
DS007913-8
Typical Split Supply
DS007913-9
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7
Physical Dimensions
inches (millimeters) unless otherwise noted
Molded SOIC Package (M)
Order Number LM1877M-9
NS Package Number M14B
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8
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
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COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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www.national.com
Molded Dual-In-Line Package (N)
Order Number LM1877N-9
NS Package Number N14A
LM1877
Dual
Audio
Power
Amplifier
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
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