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
www.national.com
Equivalent Schematic Diagram
DS007913-2
www.national.com
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.
www.national.com
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
www.national.com
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
www.national.com
5
PDF 
ZIP