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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
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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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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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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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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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Typical Applications (Continued)
Non-Inverting Amplifier Using Split Supply
DS007913-8
Typical Split Supply
DS007913-9
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Physical Dimensions inches (millimeters) unless otherwise noted
Molded SOIC Package (M)
Order Number LM1877M-9
NS Package Number M14B
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
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.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
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Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
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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