Image LM386
型号: LM386
厂商: Texas Instruments Texas Instruments
分类: 半导体
描述: low voltage audio power amplifier 8-soic 0 to 70
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LM386的详细信息

Power Stage Supply Max(V) : 94
Architecture : Class AB
Rating : Catalog
Approx. Price (US$) : 0.29 | 1ku
Power Stage Supply Min(V) : 20
Analog Supply Min [V] : 20
Operating Temperature Range(C) : 0 to 70
Estimated Footprint(mm<:
sup>:
2<:
/sup>:
) : [pf]8VSSOP[/pf]
Max. Power to Single-Ended Load : 1.6
Min. Supported Single-Ended Load : 4
Analog Supply Max [V] : 94
Package Group : PDIP,SOIC,VSSOP
Control Type : Hardware
Closed/Open Loop : Open
Max Speaker Outputs(#) : 1
Input Type : Analog
LM386  
LM386 Low Voltage Audio Power Amplifier  
Literature Number: SNAS545A  
August 2000  
LM386  
Low Voltage Audio Power Amplifier  
General Description  
Features  
n Battery operation  
n Minimum external parts  
The LM386 is a power amplifier designed for use in low volt-  
age 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.  
n Wide supply voltage range: 4V–12V or 5V–18V  
n Low quiescent current drain: 4mA  
n Voltage gains from 20 to 200  
The inputs are ground referenced while the output automati-  
cally biases to one-half the supply voltage. The quiescent  
power drain is only 24 milliwatts when operating from a 6 volt  
supply, making the LM386 ideal for battery operation.  
n Ground referenced input  
n Self-centering output quiescent voltage  
n Low distortion: 0.2% (AV = 20, VS = 6V, RL = 8, PO  
125mW, f = 1kHz)  
=
n Available in 8 pin MSOP package  
Applications  
n AM-FM radio amplifiers  
n Portable tape player amplifiers  
n Intercoms  
n TV sound systems  
n Line drivers  
n Ultrasonic drivers  
n Small servo drivers  
n Power converters  
Equivalent Schematic and Connection Diagrams  
Small Outline,  
Molded Mini Small Outline,  
and Dual-In-Line Packages  
DS006976-2  
Top View  
Order Number LM386M-1,  
LM386MM-1, LM386N-1,  
LM386N-3 or LM386N-4  
See NS Package Number  
M08A, MUA08A or N08E  
DS006976-1  
© 2000 National Semiconductor Corporation  
DS006976  
www.national.com  
Absolute Maximum Ratings (Note 2)  
If Military/Aerospace specified devices are required,  
please contact the National Semiconductor Sales Office/  
Distributors for availability and specifications.  
Dual-In-Line Package  
Soldering (10 sec)  
Small Outline Package  
(SOIC and MSOP)  
Vapor Phase (60 sec)  
Infrared (15 sec)  
+260˚C  
+215˚C  
+220˚C  
Supply Voltage  
(LM386N-1, -3, LM386M-1)  
Supply Voltage (LM386N-4)  
Package Dissipation (Note 3)  
(LM386N)  
15V  
See AN-450 “Surface Mounting Methods and Their Effect  
on Product Reliability” for other methods of soldering  
surface mount devices.  
22V  
1.25W  
0.73W  
Thermal Resistance  
(LM386M)  
θJC (DIP)  
37˚C/W  
(LM386MM-1)  
0.595W  
θJA (DIP)  
107˚C/W  
35˚C/W  
172˚C/W  
210˚C/W  
56˚C/W  
±
Input Voltage  
0.4V  
θJC (SO Package)  
θJA (SO Package)  
θJA (MSOP)  
θJC (MSOP)  
Storage Temperature  
Operating Temperature  
Junction Temperature  
Soldering Information  
−65˚C to +150˚C  
0˚C to +70˚C  
+150˚C  
Electrical Characteristics (Notes 1, 2)  
TA = 25˚C  
Parameter  
Operating Supply Voltage (VS)  
LM386N-1, -3, LM386M-1, LM386MM-1  
LM386N-4  
Conditions  
Min  
Typ  
Max  
Units  
4
5
12  
18  
8
V
V
Quiescent Current (IQ)  
Output Power (POUT  
VS = 6V, VIN = 0  
4
mA  
)
LM386N-1, LM386M-1, LM386MM-1  
LM386N-3  
VS = 6V, RL = 8, THD = 10%  
VS = 9V, RL = 8, THD = 10%  
VS = 16V, RL = 32, THD = 10%  
VS = 6V, f = 1 kHz  
250  
500  
700  
325  
700  
1000  
26  
mW  
mW  
mW  
dB  
LM386N-4  
Voltage Gain (AV)  
10 µF from Pin 1 to 8  
46  
dB  
Bandwidth (BW)  
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 µF  
Pins 1 and 8 Open, Referred to Output  
300  
0.2  
kHz  
%
Total Harmonic Distortion (THD)  
Power Supply Rejection Ratio (PSRR)  
50  
dB  
Input Resistance (RIN  
)
50  
kΩ  
Input Bias Current (IBIAS  
)
VS = 6V, Pins 2 and 3 Open  
250  
nA  
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 func-  
tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-  
antee 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 25˚C, the device must be derated based on a 150˚C maximum junction temperature and 1) a thermal resis-  
tance of 107˚C/W junction to ambient for the dual-in-line package and 2) a thermal resistance of 170˚C/W for the small outline package.  
www.national.com  
2
Application Hints  
GAIN CONTROL  
INPUT BIASING  
To make the LM386 a more versatile amplifier, two pins (1  
and 8) are provided for gain control. With pins 1 and 8 open  
the 1.35 kresistor sets the gain at 20 (26 dB). If a capacitor  
is put from pin 1 to 8, bypassing the 1.35 kresistor, 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 cou-  
pling a resistor (or FET) from pin 1 to ground.  
The schematic shows that both inputs are biased to ground  
with a 50 kresistor. The base current of the input transis-  
tors 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 kit 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 put-  
ting a resistor from the unused input to ground, equal in  
value to the dc source resistance. Of course all offset prob-  
lems are eliminated if the input is capacitively coupled.  
Additional external components can be placed in parallel  
with the internal feedback resistors to tailor the gain and fre-  
quency response for individual applications. For example,  
we can compensate poor speaker bass response by fre-  
quency shaping the feedback path. This is done with a series  
RC from pin 1 to 5 (paralleling the internal 15 kresistor).  
For 6 dB effective bass boost: R . 15 k, the lowest value  
for good stable operation is R = 10 kif pin 8 is open. If pins  
1 and 8 are bypassed then R as low as 2 kcan be used.  
This restriction is because the amplifier is only compensated  
for closed-loop gains greater than 9.  
When using the LM386 with higher gains (bypassing the  
1.35 kresistor between pins 1 and 8) it is necessary to by-  
pass the unused input, preventing degradation of gain and  
possible instabilities. This is done with a 0.1 µF capacitor or  
a short to ground depending on the dc source resistance on  
the driven input.  
3
www.national.com  
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  
DS006976-5  
DS006976-13  
DS006976-12  
Voltage Gain vs Frequency  
Distortion vs Frequency  
Distortion vs Output Power  
DS006976-15  
DS006976-16  
DS006976-14  
Device Dissipation vs Output  
Power4Load  
Device Dissipation vs Output  
Power8Load  
Device Dissipation vs Output  
Power16Load  
DS006976-17  
DS006976-18  
DS006976-19  
www.national.com  
4
Typical Applications  
Amplifier with Gain = 20  
Amplifier with Gain = 200  
Minimum Parts  
DS006976-4  
DS006976-3  
Amplifier with Gain = 50  
Low Distortion Power Wienbridge Oscillator  
DS006976-6  
DS006976-7  
Amplifier with Bass Boost  
Square Wave Oscillator  
DS006976-8  
DS006976-9  
5
www.national.com  
Typical Applications (Continued)  
Frequency Response with Bass Boost  
DS006976-10  
AM Radio Power Amplifier  
DS006976-11  
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.  
www.national.com  
6
Physical Dimensions inches (millimeters) unless otherwise noted  
SO Package (M)  
Order Number LM386M-1  
NS Package Number M08A  
7
www.national.com  
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)  
8-Lead (0.118” Wide) Molded Mini Small Outline Package  
Order Number LM386MM-1  
NS Package Number MUA08A  
www.national.com  
8
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)  
Dual-In-Line Package (N)  
Order Number LM386N-1, LM386N-3 or LM386N-4  
NS Package Number N08E  
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  
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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.  
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Corporation  
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Tel: 1-800-272-9959  
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Email: ap.support@nsc.com  
www.national.com  
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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