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LM386-1
Low Voltage Audio Power Amplifier
General Description
The LM386-1 is a power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but the addition of an external resistor and capacitor between pins 1 and 8 will increase the gain to any value from 20 to 200.
Low Voltage Audio Power Amplifier
Features
n n n n n n n n Battery operation Minimum external parts Wide supply voltage range: 4V-12V Low quiescent current drain: 4mA Voltage gains from 20 to 200 Ground referenced input Self-centering output quiescent voltage Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8, PO = 125mW, f = 1kHz) n Available in 8 pin SOP package and DIP package
The inputs are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 volt supply, making the WS386M-1 ideal for battery operation
Applications
n n n n n n n n AM-FM radio amplifiers Portable tape player amplifiers Intercoms TV sound systems Line drivers Ultrasonic drivers Small servo drivers Power converters
Ordering Information
PART NO. PACKAGE SOP-8 DIP-8
LM386M-1 LM386N-1
Equivalent Schematic and Connection Diagrams
Small Outline,
Dual in Line Package
Pin Connection
Wing Shing Computer Components Co., (H.K.)Ltd. Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153 E-mail: wsccltd@hkstar.com
8-1
LM386-1
Absolute Maximum Ratings
Supply Voltage (WS386-1)
Package Dissipation(Note3)
Soldering Information
15V
(WS386N)
1.25W
0.73W
Dual-In-Line Package Soldering (10 sec) Small Outline Package (SOIC ) Vapor Phase (60 sec) Infrared (15 sec)
+260C
+215C +220C
(WS386M)
Input Voltage Storage Temperature Operating Temperature Junction Temperature
+.4V - 65 C to +150 C
0 C to+70 C +150 C
Electrical Characteristics (Notes 1, 2)
TA = 25C ,Vcc=6V,R =8 ,f=1KHZ, unless otherwise specified Parameter Operating Supply Voltage (VS)
4 12
Conditions
Min
Typ
Max
Units
V
Quiescent Current (IQ) Output Power (POUT)
VS = 6V, VIN = 0
V S = 6V, RL = 8, THD = 10%
4 250 325
8
mA mW
V s = 9V,RL =8 , THD =10%
Bandwidth (BW)
Voltage Gain (AV) Bandwidth (BW) Total Harmonic Distortion (THD) Power Supply Rejection Ratio (PSRR) Input Resistance (RIN) Input Bias Current (IBIAS)
Vs = 6V,10uF from Pin 1 to 8
VS = 6V, f = 1 kHz 10 F from Pin 1 to 8 VS = 6V, Pins 1 and 8 Open VS = 6V, RL = 8, POUT = 125 mW f = 1 kHz, Pins 1 and 8 Open VS = 6V, f = 1 kHz, CBYPASS = 10 F Pins 1 and 8 Open, Referred to Output
50 0
700 60
26 46 300 0.2 50 50
kHz
dB dB kHz % dB k nA
Pins 1 and 8 Open
VS = 6V, Pins 2 and 3 Open
250
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: 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. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 3: For operation in ambient temperatures above 25C, the device must be derated based on a 150C maximum junction temperature and a thermal resistance of 170C/W for the small outline package.
8-2
LM386-1
Application Hints
GAIN CONTROL INPUT BIASING The schematic shows that both inputs are biased to ground with a 50 k resistor. The base current of the input transistors is about 250 nA, so the inputs are at about 12.5 mV when left open. If the dc source resistance driving the LM386 is higher than 250 k it will contribute very little additional offset (about 2.5 mV at the input, 50 mV at the output). If the dc source resistance is less than 10 k, then shorting the unused input to ground will keep the offset low (about 2.5 mV at the input, 50 mV at the output). For dc source resistances between these values we can eliminate excess offset by putting a resistor from the unused input to ground, equal in value to the dc source resistance. Of course all offset problems are eliminated if the input is capacitively coupled. When using LM386-1 with higher gains (bypassing the 1.35 k resistor between pins 1 and 8) it is necessary to bypass the unused input, preventing degradation of gain and possible instabilities. This is done with a 0.1 F capacitor or a short to ground depending on the dc source resistance on the driven input.
To make LM386-1 a more versatile amplifier, two pins (1
and 8) are provided for gain control. With pins 1 and 8 open the 1.35 k resistor sets the gain at 20 (26 dB). If a capacitor is put from pin 1 to 8, bypassing the 1.35 k resistor, the gain will go up to 200 (46 dB). If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to 200. Gain control can also be done by capacitively coupling a resistor (or FET) from pin 1 to ground. Additional external components can be placed in parallel with the internal feedback resistors to tailor the gain and frequency response for individual applications. For example, we can compensate poor speaker bass response by frequency shaping the feedback path. This is done with a series RC from pin 1 to 5 (paralleling the internal 15 k resistor). For 6 dB effective bass boost: R . 15 k, the lowest value for good stable operation is R = 10 k if pin 8 is open. If pins 1 and 8 are bypassed then R as low as 2 k can be used. This restriction is because the amplifier is only compensated for closed-loop gains greater than 9.
Pad Location
8 1
90 90
7
6 5
2 4B Y 0 3 X 4A Chip size 1.4 x 1.6 mm
Pad Location Coordinates
Pad N 1 2 3 4A 4B 5 6 7 8 Pad Name Gain -input +input GND GND VOUT VCC BYPASS Gain Coordinates X 120 120 120 550 600 600 750 440 120 Y 975 665 100 100 390 1015 1405 1405 1405
8-3
LM386-1
Typical Performance Characteristics
Quiescent Supply Current vs Supply Voltage Power Supply Rejection Ratio (Referred to the Output) vs Frequency Peak-to-Peak Output Voltage Swing vs Supply Voltage
Voltage Gain vs Frequency
Distortion vs Frequency
Distortion vs Output Power
Device Dissipation vs Output Power -- 4 Load
Device Dissipation vs Output Power -- 8 Load
Device Dissipation vs Output Power -- 16 Load
8-4
LM386-1
Typical Applications
Amplifier with Gain = 20 Minimum Parts Amplifier with Gain = 200
Amplifier with Gain = 50
Low Distortion Power Wienbridge Oscillator
Amplifier with Bass Boost
Square Wave Oscillator
8-5
LM386-1
Typical Applications
(Continued) Frequency Response with Bass Boost
AM Radio Power Amplifier
Note 4: Twist Supply lead and supply ground very tightly. Note 5: Twist speaker lead and ground very tightly. Note 6: Ferrite bead in Ferroxcube K5-001-001/3B with 3 turns of wire. Note 7: R1C1 band limits input signals. Note 8: All components must be spaced very closely to IC.
8-6
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Dual-In-Line Package
LM386N-1
8-7
LM386-1
Physical Dimensions
inches (millimeters) unless otherwise noted
SO Package
LM386M-1
8-8

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