LM386 Voltage Audio Power Amplifier LM386 power amplifier designe
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LM386 Voltage Audio Power Amplifier
LM386 Voltage Audio Power Amplifier
LM386 power amplifier designed voltage consumer applications. gain internally keep external part count low, addition external resistor capacitor between pins will increase gain value 200. inputs ground referenced while output automatically biased half supply voltage. quiescent power drain only milliwatts when operating from volt supply, making LM386 ideal battery operation.
Features
Battery operation Minimum external parts Wide supply voltage range: 4V-12V 5V-18V quiescent current drain: Voltage gains from Ground referenced input Self-centering output quiescent voltage distortion Available MSOP package
Applications
AM-FM radio amplifiers Portable tape player amplifiers Intercoms sound systems Line drivers Ultrasonic drivers Small servo drivers Power converters
Equivalent Schematic Connection Diagrams
Small Outline, Molded Mini Small Outline, Dual-In-Line Packages
DS006976-2
DS006976-1
View Order Number LM386M-1, LM386MM-1, LM386N-1, LM386N-3 LM386N-4 Package Number M08A, MUA08A N08E
2000 National Semiconductor Corporation
DS006976
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LM386
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage (LM386N-1, LM386M-1) Supply Voltage (LM386N-4) Package Dissipation (Note (LM386N) (LM386M) (LM386MM-1) Input Voltage Storage Temperature Operating Temperature Junction Temperature Soldering Information 1.25W 0.73W 0.595W 0.4V -65°C +150°C +70°C +150°C
Dual-In-Line Package Soldering sec) +260°C Small Outline Package (SOIC MSOP) Vapor Phase sec) +215°C Infrared sec) +220°C AN-450 "Surface Mounting Methods Their Effect Product Reliability" other methods soldering surface mount devices. Thermal Resistance 37°C/W (DIP) 107°C/W (DIP) 35°C/W Package) 172°C/W Package) 210°C/W (MSOP) 56°C/W (MSOP)
Electrical Characteristics (Notes
25°C Parameter Operating Supply Voltage (VS) LM386N-1, LM386M-1, LM386MM-1 LM386N-4 Quiescent Current (IQ) Output Power (POUT) LM386N-1, LM386M-1, LM386MM-1 LM386N-3 LM386N-4 Voltage Gain (AV) Bandwidth (BW) Total Harmonic Distortion (THD) Power Supply Rejection Ratio (PSRR) Input Resistance (RIN) Input Bias Current (IBIAS) Pins Open
Note voltages measured with respect ground pin, unless otherwise specified. Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device functional, guarantee specific performance limits. Electrical Characteristics state electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that device within Operating Ratings. Specifications guaranteed parameters where limit given, however, typical value good indication device performance. Note operation ambient temperatures above 25°C, device must derated based 150°C maximum junction temperature thermal resistance 107°C/W junction ambient dual-in-line package thermal resistance 170°C/W small outline package.
Conditions
Units
16V, from Pins Open POUT kHz, Pins Open kHz, CBYPASS Pins Open, Referred Output
1000
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LM386
Application Hints
GAIN CONTROL make LM386 more versatile amplifier, pins provided gain control. With pins open 1.35 resistor sets gain dB). capacitor from bypassing 1.35 resistor, gain will dB). resistor placed series with capacitor, gain value from 200. Gain control also done capacitively coupling resistor FET) from ground. Additional external components placed parallel with internal feedback resistors tailor gain frequency response individual applications. example, compensate poor speaker bass response frequency shaping feedback path. This done with series from (paralleling internal resistor). effective bass boost: lowest value good stable operation open. pins bypassed then used. This restriction because amplifier only compensated closed-loop gains greater than INPUT BIASING schematic shows that both inputs biased ground with resistor. base current input transistors about inputs about 12.5 when left open. source resistance driving LM386 higher than will contribute very little additional offset (about input, output). source resistance less than then shorting unused input ground will keep offset (about input, output). source resistances between these values eliminate excess offset putting resistor from unused input ground, equal value source resistance. course offset problems eliminated input capacitively coupled. When using LM386 with higher gains (bypassing 1.35 resistor between pins necessary bypass unused input, preventing degradation gain possible instabilities. This done with capacitor short ground depending source resistance driven input.
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LM386
Typical Performance Characteristics
Quiescent Supply Current Supply Voltage Power Supply Rejection Ratio (Referred Output) Frequency Peak-to-Peak Output Voltage Swing Supply Voltage
DS006976-5 DS006976-13 DS006976-12
Voltage Gain Frequency
Distortion Frequency
Distortion Output Power
DS006976-14
DS006976-15
DS006976-16
Device Dissipation Output Power Load
Device Dissipation Output Power Load
Device Dissipation Output Power Load
DS006976-17
DS006976-18
DS006976-19
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LM386
Typical Applications
Amplifier with Gain Minimum Parts Amplifier with Gain
DS006976-4 DS006976-3
Amplifier with Gain
Distortion Power Wienbridge Oscillator
DS006976-6
DS006976-7
Amplifier with Bass Boost
Square Wave Oscillator
DS006976-8
DS006976-9
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LM386
Typical Applications
(Continued) Frequency Response with Bass Boost
DS006976-10
Radio Power Amplifier
DS006976-11
Note Twist Supply lead supply ground very tightly. Note Twist speaker lead ground very tightly. Note Ferrite bead Ferroxcube K5-001-001/3B with turns wire. Note R1C1 band limits input signals. Note components must spaced very closely
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LM386
Physical Dimensions
inches (millimeters) unless otherwise noted
Package Order Number LM386M-1 Package Number M08A
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LM386
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
8-Lead (0.118" Wide) Molded Mini Small Outline Package Order Number LM386MM-1 Package Number MUA08A
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LM386 Voltage Audio Power Amplifier
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Dual-In-Line Package Order Number LM386N-1, LM386N-3 LM386N-4 Package Number N08E
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National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.
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