NSC LM1877

LM1877
Dual Audio Power Amplifier
General Description
The LM1877 is a monolithic dual power amplifier designed to
deliver 2W/channel continuous into 8Ω loads. The LM1877 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, etc.
Each power amplifier is biased from a common internal regulator 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
n
n
n
n
Wide supply range, 6V–24V
Very low cross-over distortion
Low audio band noise
AC short circuit protected
Internal thermal shutdown
Applications
n
n
n
n
n
n
n
Multi-channel audio systems
Stereo phonographs
Tape recorders and players
AM-FM radio receivers
Servo amplifiers
Intercom systems
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
© 1999 National Semiconductor Corporation
DS007913
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LM1877 Dual Audio Power Amplifier
February 1995
Equivalent Schematic Diagram
DS007913-2
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2
Absolute Maximum Ratings (Note 1)
M-Package Infared (15 sec.)
M-Package Vapor Phase (60 sec.)
Thermal Resistance
θJC (N-Package)
θJA (N-Package)
θJC (M-Package)
θJA (M-Package)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
Input Voltage
Operating Temperature
Storage Temperature
Junction Temperature
Lead Temperature
N-Package Soldering (10 sec.)
26V
± 0.7V
0˚C to +70˚C
−65˚C to +150˚C
150˚C
220˚C
215˚C
30˚C/W
79˚C/W
27˚C/W
114˚C/W
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to
the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits.
260˚C
Electrical Characteristics
VS = 20V, TA = 25˚C, (Note 2) RL = 8Ω, AV = 50 (34 dB) unless otherwise specified
Parameter
Total Supply Current
Output Power
LM1877
Conditions
Min
PO = 0W
THD = 10%
VS = 20V, RL = 8Ω
VS = 12V, RL = 8Ω
Typ
Max
Units
25
50
mA
2.0
W/Ch
1.3
W/Ch
0.075
%
0.045
%
Total Harmonic Distortion
LM1877
Output Swing
Channel Separation
PSRR Power Supply
Rejection Ratio
Noise
Open Loop Gain
f = 1 kHz, VS = 14V
PO = 50 mW/Channel
PO = 500 mW/Channel
PO = 1 W/Channel
RL = 8Ω
CF = 50 µF, CIN = 0.1 µF,
f = 1 kHz, Output Referred
VS = 20V, VO = 4 Vrms
−50
VS = 7V, VO = 0.5 Vrms
CF = 50 µF, CIN = 0.1 µF,
f = 120 Hz, Output Referred
VS = 20V, VRIPPLE = 1 Vrms
VS = 7V, VRIPPLE = 0.5 Vrms
−50
Equivalent Input Noise
RS = 0, CIN = 0.1 µF,
BW = 20 Hz–20 kHz, Output Noise Wideband
RS = 0, CN = 0.1 µF, AV 200
RS = 0, f = 100 kHz, RL = 8Ω
Input Offset Voltage
Input Bias Current
Input Impedance
DC Output Level
Open Loop
VS = 20V
9
Slew Rate
0.055
%
VS −6
Vp-p
−70
dB
−60
dB
−65
dB
−40
dB
2.5
µV
0.80
mV
70
dB
15
mV
50
nA
4
MΩ
10
11
V
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
Power Supply Rejection Ratio
(Referred to the Output) vs
Frequency
Power Supply Rejection Ratio
(Referred to the Output) vs
Frequency
DS007913-10
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Power Supply Rejection Ratio
(Referred to the Output) vs
Supply Voltage
Channel Separation (Referred
to the Output) vs Frequency
DS007913-12
Channel Separation (Referred
to the Output) vs Frequency
DS007913-14
DS007913-15
DS007913-13
Average Supply Current vs
POUT
Total Harmonic Distortion
vs Frequency
DS007913-16
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Total Harmonic Distortion
vs Frequency
DS007913-17
4
DS007913-18
Typical Performance Characteristics
Power Dissipation (W)
Both Channels Operating
(Continued)
Open Loop Gain vs
Frequency
Output Swing vs Supply
Voltage
DS007913-21
DS007913-20
DS007913-19
Typical Applications
Stereo Phonograph Amplifier with Bass Tone Control
DS007913-4
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Typical Applications
(Continued)
Inverting Unity Gain Amplifier
Frequency Response of Bass Tone Control
DS007913-5
DS007913-6
Stereo Amplifier with AV = 200
DS007913-7
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Typical Applications
(Continued)
Typical Split Supply
Non-Inverting Amplifier Using Split Supply
DS007913-9
DS007913-8
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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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LM1877 Dual Audio Power Amplifier
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package (N)
Order Number LM1877N-9
NS Package Number N14A
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