Datasheet LM 386 DIP Datasheet (FREI)

UNISONIC TECHNOLOGIES CO.,

LM386

LINEAR INTEGRATED CIRCUIT

LOW VOLTAGE AUDIO POWER AMPLIFIER

 DESCRIPTION

The UTC LM386 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 pin 1 and pin 8 will increase the gain to any value up from 20 to 200.

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 voltage supply, making the LM386 ideal for battery operation.

 FEATURES

*Battery operation *Minimum external parts *Wide supply voltage range: 4V~12V *Low quiescent current drain:4mA *Voltage gains:20~200 *Ground referenced input *Self-centering output quiescent voltage *Low distortion:0.2%(Av =20,Vs=6V,RL=8Ω,Po=125mW,f=1kHz)

SOP-8

TSSOP-8

DIP-8

*Pb-free plating product number:LM386L

 ORDERING INFORMATION

Order Number

Normal Lead Free Plating LM386-S08-R LM386L-S08-R SOP-8 Tape Reel LM386-S08-T LM386L-S08-T SOP-8 Tube LM386-P08-R LM386L-P08-R TSSOP-8 Tape Reel LM386-P08-T LM386L-P08-T TSSOP-8 Tube LM386-D08-T LM386L-D08-T DIP-8 Tube

Package Packing

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LM386 LINEAR INTEGRATED CIRCUIT

 PIN CONFIGURATION

 BLOCK DIAGRAM

BYPASS

2

-INPUT

Gain

-Input

+Input

7

15K

1

2

8

7

Gain

Bypass

UTC LM38 6

3

45

6

VCC

OutputGND

15K

GAINGAIN

8

150 1.35K

1

15K

3

+INPUT

6

Vs

5

OUT

V

50K

4

GND

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LM386 LINEAR INTEGRATED CIRCUIT

 ABSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNIT Supply Voltage VCC 15 V Input Voltage VIN -0.4V ~ +0.4V V

DIP-8 1250

Power Dissipation

SOP-8 600

TSSOP-8 Operating Temperature T Junction Temperature TJ +125 °C Storage Temperature T Note:1. Absolute maximum ratings are stress ratings only and functional device operation is not implied. The device

could be damaged beyond Absolute maximum ratings.

2. The device is guaranteed to meet performance specifications within 0 ℃~70℃ operating temperature range and assured by design from –20℃~85℃.



ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified.)

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Supply Voltage Vss 4 12 V Quiescent Current IQ Vss=6V, VIN=0 4 8 mA

Output Power P

OUT

Voltage Gain GV Bandwidth BW Vss=6V , Pin1 and pin 8 open 300 kHz Total Harmonic Distortion THD

Rejection Ratio RR

Input Resistance RIN 50 kΩ Input Bias Current I

Vss=6V Pin2 and pin 3 open 250 nA

BIAS

PD

0 ~ +70 °C

OPR

-40 ~ +150 °C

STG

Vss=6V, RL=8Ω, THD=10% Vss=9V, R

=8Ω, THD=10%

L

Vss=6V, f=1kHz 10µF from pin 1 to pin 8

P

=125mW, Vs=6V,f=1kHz

OUT

RL=8Ω pin1 and pin 8 open Vss=6V, f=1kHz, C

BYPASS

=10µF pin1and pin 8 open, Referred to output

600

250 500

325 700

26

46

0.2 %

50 dB

mW

dB

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LM386 LINEAR INTEGRATED CIRCUIT

 APPLICATION NOTES

GAIN CONTROL

To make the LM386 a more versatile amplifier, two pins(1and 8) are provided for gain control. With pins 1 and 8 open the 1.35 kΩ resistor sets the gain at 20(26dB),If a capacitor is put from pin 1 to 8,bypassing the 1.35 kΩ resistor, the gain will go up to 200(46dB).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 b y frequency shaping the feedback path. This is done with a series RC from pin 1 to 5 (paralleling the internal 15 kΩ resistor). For 6 dB effective bass boost: R=15 kΩ, the lowest value for good stable operation is R=10 k Ω, if pin 8 is open, If pins 1 and 8 are bypassed then R as low as 2 kΩ can be used. This restriction is because the amplifier is only compensated for closed-loop gains greater than 9.

INPUT BIASING

The schematic shows that both inputs are biased to ground with a 50 kΩ resistor. The base current of the input transistors is about 250nA, so the inputs are at about 12.5mW when left open. If the dc source resistance driving the LM386 is higher than 250 kΩ it will contribute very little additional offset (about 2.5mW at the input, 50mW at the output).If the dc source resistance is less than 10 kΩ,then shorting the unused input to ground will keep the offset low (about 2.5mV 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 the LM386 with higher gains (bypassing the 1.35 k Ω 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 0.1µF capacitor or a short to ground depending on the dc source resistance on the driven input.

TYPICAL APPLICATIONS CIRCUIT



Amplifier with Gain=20

Minimum Parts

Vs

6

2

-

1

V

IN

10K

3

+

7

4

250µF

8

+

5

0.05µF

10

Amplifier with Gain=200

V

IN

10K

10µF

Vs

+

6

2

-

1

3

+

7

4

BYPASS

250µF

8

+

5

0.05µF

10

Amplifier with Gain=50

Vs

1.2K

6

2

-

V

IN

10K

3

+

4

10µF

1

7

BYPASS

250µF

8

+

5

10

0.05µF

ELDEMA

CF-S-2158

Low Distortion Power Wienbridge O scillator

10µF

Vs

+

6

2

-

1

4

3V-15mA

f=1kHz

3

+

4.7K

7

BYPASS

0.01µF

390

47K

8 5

50µF +

0.05µF

10

V

o

R

L

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LM386 LINEAR INTEGRATED CIRCUIT

 TYPICAL APPLICATIONS CIRCUIT(cont.)

Amplifier with Bass Boost

Square Ware Oscillator

10K

Vs

6

2

-

3

+

4

BYPASS

7

1

0.033µF

8

10K

250µF +

5

0.05µF

10Ω

O

V

R

L

0.1µF

AM Radio Power Amplifier

FROM

DETECTOR

Cc

VOL 10K

R1

10K

Vs

0.05µ F

C1

2

-

2200pF

3

+

Note 1: Twist Supply lead and supply ground very tightly. Note 2: Twist speaker lead and ground very tightly. Note 3: Ferrite bead in Ferroxcube K5-001-001/3B with 3 turns of wire. Note 4: R1C1 band limits input signals. Note 5: All components must be spaced very closely to IC.

10µ F

+

6

1

8

5

7

4

+

10µ F

47

Vs

2

-

3

+

1K

FERRITE

BEAD

6

1

4

f=1kHz

250µ F

+

0.05µ F

8

5

10K

50µF

+

30K

V

R

L

8Ω

SPEAKER

O

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LM386 LINEAR INTEGRATED CIRCUIT

 TYPICAL CHARACTERISTICS

Quiescent Supply Current vs Supply Voltage

6

5

4

3

Supply Current (mA)

2

Power Supply Rejection Ratio(Referred

to the Output) vs Frequency

60

C7=50µF

50

40

30

20

Power Supply Rejection (dB)

10

1µF

10µF

NO BYPASSCAPACITOR

Vs=6V

Av=26dB

0.5µF

1

4 5 6 7 8 9 101112

Supply Voltage(volts)

Peak-to -P eak Output Voltage Swing vs Supply Voltage

10

8

6

4

2

Output Voltage (Vol ts Peak-To-Peak)

0

456789101112

Supply Voltage(volts)

Voltage Gain vs Frequency

60

C

50

40

30

20

Voltage Gain (dB)

10

0

100 1K 10K 100K 1M

1.8

C

1.8

Frequency (Hz)

RL=∞

16

8

4

=10µF

=0

0

10 100 1K 10K 100K

Frequency (Hz)

Frequency Response With Bass Boost 27 26 25

24 23

22 21

20

Voltage Gain (dB)

19

18

17

20 50 100 200 5001K2K 5K10K

Frequency (Hz)

20K

Distortion vs Frequency

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Total Harmonic Distortion (%)

0.2

0

Vs=6V R

L

=8Ω

P

OUT

=125mW

1.8

Av=26dB(C

20 50 100200 5001K 2K 5K10K

=0)

Frequency (Hz)

20K

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LM386 LINEAR INTEGRATED CIRCUIT

 TYPICAL CHARACTERISTICS(cont.)

Distortion vs Output Power

10

Vs=6V

9

R

L

=8Ω

8

f=1kHz

7 6 5

4

3

2

Total Harmonic Distortion (%)

1 0

Power Output (Watts )

0.10.001 0.01 1.0

Device Dissipaton vs Output Power -

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Device Dissipation (W)

0.2 0

0 0.1 0.2 0.3 0.4

4ΩLoad

Vs= 12V

Vs=9V

Vs=6V

O utput Power (W)

3% THD

LEVEL

10% THD

LEVEL

0.5

Devic e Dissipaton vs Output Power -

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

Device Dissipation (W)

0.2 0

0 0.1 0.2 0.3 0.4

8ΩLoad

Vs=16V

Vs= 12V

Vs=9V

Vs=6V

0.5

Output Power (W)

10%

THD

LEVEL

3% THD

LEVEL

0.60.7 0.80.91.0

Devic e Dissipaton vs Output Power -16ΩLoad

1.0 3% THD

LEVEL

10% THD

LEVEL

1.2 1.4 1.6 1 .8 2.0

0.8

0.6

0.4

0.2

Device Dissipation (W)

0

0 0 .2 0.4 0.60.8

Vs=16V

Vs= 12V

Vs=9V

Vs=6V

1.0

Output Power (W)

UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UT C products described or contained herein. UTC products are not designed f or use in life support appliances, devi ces or systems where malf unction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believ ed to be accurate and reliable and may be c hanged without notice.

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