NSC LM1877N-9A, LM1877MX-9, LM1877M-9, LM1877N-9 Datasheet
LM1877
Dual Audio Power Amplifier
General Description
The LM1877 is a monolithic dual power amplifier designed to
deliver 2W/channel continuous into8Ωloads.TheLM1877is
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, etc.
Each power amplifier is biased fromacommoninternalregulator 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, 6V–24V
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
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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 0˚C to +70˚C
Storage Temperature −65˚C to +150˚C
Junction Temperature 150˚C
Lead Temperature
N-Package Soldering (10 sec.) 260˚C
M-Package Infared (15 sec.) 220˚C
M-Package Vapor Phase (60 sec.) 215˚C
Thermal Resistance
θ
JC
(N-Package) 30˚C/W
θ
JA
(N-Package) 79˚C/W
θ
JC
(M-Package) 27˚C/W
θ
JA
(M-Package) 114˚C/W
Note 1: Absolute Maximum Ratings indicate limits beyondwhichdamage to
the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits.
Electrical Characteristics
V
S
=
20V, T
A
=
25˚C, (Note 2) R
L
=
8Ω,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
=
8Ω 2.0 W/Ch
V
S
=
12V, R
L
=
8Ω 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
=
8Ω V
S
−6 Vp-p
Channel Separation C
F
=
50 µF, C
IN
=
0.1 µF,
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 µF, C
IN
=
0.1 µF,
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 µF, 2.5 µV
BW=20 Hz–20 kHz, Output Noise Wideband
R
S
=
0, C
N
=
0.1 µF, A
V
200 0.80 mV
Open Loop Gain R
S
=
0, f=100 kHz, R
L
=
8Ω 70 dB
Input Offset Voltage 15 mV
Input Bias Current 50 nA
Input Impedance Open Loop 4 MΩ
DC Output Level V
S
=
20V 9 10 11 V
Slew Rate 2.0 V/µs
Power Bandwidth 65 kHz
Current Limit 1.0 A
Note 2: For operation at ambient temperature greater than 25˚C, the LM1877 must be derated based on a maximum 150˚C junction temperature.
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