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Part: LM2878P
Category:
Description: Ic-power Audio Amp
Company:
Datasheet: Download LM2878P datasheet File size : 634 kB
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LM2878 Dual 5 Watt Power Audio Amplifier
December 1994
LM2878 Dual 5 Watt Power Audio Amplifier
General Description
The LM2878 is a high voltage stereo power amplifier designed to deliver 5W channel continuous into 8X loads The amplifier is ideal for use with low regulation power supplies due to the absolute maximum rating of 35V and its superior power supply rejection The LM2878 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 The flexibility of the LM2878 allows it to be used as a power operational amplifier power comparator or servo amplifier The LM2878 is internally compensated for all gains greater than 10 and comes in an 11-lead single-in-line package (SIP) The package has been redesigned resulting in the slightly degraded thermal characteristics shown in the figure Device Dissipation vs Ambient Temperature
Y Y Y Y Y Y Y
eatures
Wide operating range 6V 32V 5W channel output 60 dB ripple rejection output referred 70 dB channel separation output referred Low crossover distortion AC short circuit protected Internal thermal shutdown
Applications
Y Y Y Y
F
Stereo phonographs AM-FM radio receivers Power op amp power comparator Servo amplifiers
Typical Applications
Frequency Response of Bass Tone Control
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FIGURE 1 Stereo Phonograph Amplifier with Bass Tone Control
C1995 National Semiconductor Corporation
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RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
p If Military Aerospace specified devices are required lease contact the National Semiconductor Sales S Office Distributors for availability and specifications upply Voltage Input Voltage (Note 1) Operating Temperature (Note 2) 35V
g 0 7V 0 C to a 70 C
Storage Temperature Junction Temperature Lead Temperature (Soldering 10 sec ) Thermal Resistance iJC iJA
b 65
C to a 150 C a 150 C a 260 C
10 C W 55 C W
ElectP ical Characteristics VS e 22V r
arameter Total Supply Current Operating Supply Voltage Output Power Channel Distortion PO e 0W
TTAB e 25 C RL e 8X AV e 50 (34 dB) unless otherwise specified Min Typ 10 6 Max 50 32 55 13 0 20 0 15 0 14 VS b 6V
b 50 b 70
Conditions
Units mA V W W % % % Vp-p dB
f e 1 kHz THD e 10% TTAB e 25 C f e 1 kHz THD e 10% VS e 12V f e 1 kHz RL e 8X PO e 50 mW PO e 0 5W PO e 2W
5
Output Swing Channel Separation
RL e 8X CBYPASS e 50 mF CIN e 0 1 mF f e 1 kHz Output Referred VO e 4 Vrms CBYPASS e 50 mF CIN e 0 1 mF f e 120 Hz Output Referred Vripple e 1 Vrms Measured at DC Input Referred Split Supplies g 15V Pin 1 Tied to Pin 11
PSRR Power Supply Rejection Ratio PSRR Negative Supply Common-Mode Range Input Offset Voltage Noise
b 50
b 60 b 60
g 13 5
dB dB V mV mV mV mV dB nA MX 12 V V mS kHz A
10 Equivalent Input Noise RS e 0 CIN e 0 1 mF BW e 20 b 20 kHz CCIR ARM Output Noise Wideband RS e 0 CIN e 0 1 mF AV e 200 25 30 08 70 100 Open Loop VS e 22V 10 4 11 2 3 dB Bandwidth at 2 5W 65 15
Open Loop Gain Input Bias Current Input Impedance DC Output Voltage Slew Rate Power Bandwidth Current Limit
RS e 51X f e 1 kHz RL e 8X
Note 1 g0 7V applies to audio applications for extended range see Application Hints ote 2 For operation at ambient temperature greater than 25 C the LM2878 must be derated based on a maximum 150 C junction temperature using a thermal resistance which depends upon device mounting techniques 2
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
Power Supply Rejection Ratio (Referred to the Output) vs Supply Voltage
Channel Separation (Referred to the Output) vs Frequency
Total Harmonic Distortion vs Frequency
Total Harmonic Distortion vs Frequency
Total Harmonic Distortion vs Power Out
Open Loop Gain vs Frequency
Power Output Channel vs Supply Voltage
Power Dissipation vs Power Out
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3
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