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UNISONIC TECHNOLOGIES CO., LM386
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.
LINEAR INTEGRATED CIRCUIT
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=8,Po=125mW,f=1kHz)
ORDERING INFORMATION
Normal LM386-S08-R LM386-S08-T LM386-P08-R LM386-P08-T LM386-D08-T Ordering Number Lead Free LM386L-S08-R LM386L-S08-T LM386L-P08-R LM386L-P08-T LM386L-D08-T Halogen Free LM386G-S08-R LM386G-S08-T LM386G-P08-R LM386G-P08-T LM386G-D08-T Package SOP-8 SOP-8 TSSOP-8 TSSOP-8 DIP-8 Packing Tape Reel Tube Tape Reel Tube Tube
www.unisonic.com.tw Copyright (c) 2011 Unisonic Technologies Co.,
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PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
6 15K GAIN GAIN 8 1 150 -INPUT 2 1.35K 3 +INPUT
Vs
BYPASS
7
15K
15K
5
VOUT
50K
50K 4
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Input Voltage SYMBOL VCC VIN
LINEAR INTEGRATED CIRCUIT
RATINGS UNIT 15 V -0.4V ~ +0.4V V DIP-8 1250 Power Dissipation PD mW SOP-8 600 TSSOP-8 600 Operating Temperature TOPR -20 ~ +85 C Junction Temperature TJ +125 C Storage Temperature TSTG -40 ~ +150 C 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.
ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise specified.)
PARAMETER Operating Supply Voltage Quiescent Current Output Power Voltage Gain Bandwidth Total Harmonic Distortion Rejection Ratio Input Resistance Input Bias Current SYMBOL Vss IQ POUT GV BW THD RR RIN IBIAS TEST CONDITIONS Vss=6V, VIN=0 Vss=6V, RL=8, THD=10% Vss=9V, RL=8, THD=10% Vss=6V, f=1kHz 10F from pin 1 to pin 8 Vss=6V , Pin1 and pin 8 open POUT=125mW, Vs=6V,f=1kHz RL=8 pin1 and pin 8 open Vss=6V, f=1kHz, CBYPASS=10F pin1and pin 8 open, Referred to output Vss=6V Pin2 and pin 3 open MIN 4 250 500 TYP 4 325 700 26 46 300 0.2 50 50 250 MAX UNIT 12 V 8 mA mW dB dB kHz % dB k nA
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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APPLICATION NOTES
LINEAR INTEGRATED CIRCUIT
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 k resistor sets the gain at 20(26dB),If a capacitor is put from pin 1 to 8,bypassing the 1.35 k 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 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. 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 250nA, so the inputs are at about 12.5mW when left open. If the dc source resistance driving the LM386 is higher than 250 k it will contribute very little additional offset (about 2.5mW at the input, 50mW 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 2.5mV 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 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 0.1F capacitor or a short to ground depending on the dc source resistance on the driven input.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL APPLICATIONS CIRCUIT
LINEAR INTEGRATED CIRCUIT
AM Radio Power Amplifier Cc Vs R1 10K
0.05F
FROM DETECTOR
10F + 2 6 1 85 3+ 4 7 +10F
47
VOL 10K
C1 2200pF
FERRITE BEAD
250F + + 8 SPEAKER
47
0.05F
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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS
Quiescent Supply Current vs Supply Voltage 6 Power Supply Rejection (dB)
LINEAR INTEGRATED CIRCUIT
Power Supply Rejection Ratio(Referred to the Output) vs Frequency 60 C7=50F 50 40 30 10F 20 10 0 10 NO BYPASSCAPACITOR Vs=6V Av=26dB 1F 0.5F
Supply Current (mA)
5 4 3
2 1 4 5 6 7 8 9 10 11 12 Supply Voltage(volts) Peak-to -Peak Output Voltage Swing vs Supply Voltage Output Voltage (Volts Peak-To-Peak) 10
100
1K
10K
100K
Frequency (Hz) Frequency Response With Bass Boost 27 26 25 Voltage Gain (dB) 8 24 23 22 21 20 19 18 17 20
RL=
16
8 6 4 4 2 0 4 5 6 7 8 9 10 11 12 Supply Voltage(volts)
50 100 200 500 1K 2K Frequency (Hz)
5K 10K 20K
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
Total Harmonic Distortion (%)
Voltage Gain (dB)
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TYPICAL CHARACTERISTICS(cont.)
Distortion vs Output Power 10 9 Total Harmonic Distortion (%) 8 7 6 5 4 3 2 1 0 0.001 0.01 0.1 1.0 Vs=6V RL=8 f=1kHz Device Dissipation (W)
LINEAR INTEGRATED CIRCUIT
Device Dissipaton vs Output Power 4Load 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 0.1 0.2 0.3 0.4 0.5 Vs=6V 10% THD LEVEL Vs=9V Vs=12V 3% THD LEVEL
Power Output (Watts) Device Dissipaton vs Output Power 8Load 2.0 1.8 1.6 Device Dissipation (W) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 Vs=6V 3% THD LEVEL Vs=12V Vs=9V Vs=16V 10% THD LEVEL
Output Power (W) Device Dissipaton vs Output Power -16Load 1.0 Vs=16V 0.8 Device Dissipation (W) 3% THD LEVEL
0.6 Vs=12V 0.4 10% THD LEVEL Vs=9V Vs=6V 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Output Power (W)
0.2
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 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 UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction 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 believed to be accurate and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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