LM386_15 [UTC]
LOW VOLTAGE AUDIO POWER AMPLIFIER;
| 型号： | LM386_15 |
| 厂家： | 
Unisonic Technologies |
| 描述： | LOW VOLTAGE AUDIO POWER AMPLIFIER 放大器 功率放大器 |
| 文件： | 总8页 (文件大小：249K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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)
ORDERING INFORMATION
Ordering Number
Lead Free
Package
Packing
Normal
Halogen Free
LM386G-S08-R
LM386G-S08-T
LM386G-P08-R
LM386G-P08-T
LM386G-D08-T
LM386-S08-R
LM386-S08-T
LM386-P08-R
LM386-P08-T
LM386-D08-T
LM386L-S08-R
LM386L-S08-T
LM386L-P08-R
LM386L-P08-T
LM386L-D08-T
SOP-8
SOP-8
Tape Reel
Tube
TSSOP-8
TSSOP-8
DIP-8
Tape Reel
Tube
Tube
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co.,
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LM386
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
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LM386
LINEAR INTEGRATED CIRCUIT
BLOCK DIAGRAM
6
Vs
15K
7
BYPASS
15K
GAIN GAIN
8
1
15K
3
5
VOUT
150 1.35K
2
-INPUT
+INPUT
50K
50K
4
GND
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LM386
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VCC
RATINGS
15
UNIT
V
Supply Voltage
Input Voltage
VIN
-0.4V ~ +0.4V
1250
V
DIP-8
Power Dissipation
PD
mW
SOP-8
TSSOP-8
600
600
Operating Temperature
Junction Temperature
Storage Temperature
TOPR
TJ
-20 ~ +85
+125
°C
°C
°C
TSTG
-40 ~ +150
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=25°C, unless otherwise specified.)
PARAMETER
SYMBOL
Vss
TEST CONDITIONS
MIN TYP MAX UNIT
Operating Supply Voltage
Quiescent Current
4
12
8
V
IQ
Vss=6V, VIN=0
4
mA
Vss=6V, RL=8Ω, THD=10%
Vss=9V, RL=8Ω, THD=10%
250 325
500 700
Output Power
POUT
mW
Vss=6V, f=1kHz
10μF from pin 1 to pin 8
Vss=6V , Pin1 and pin 8 open
26
46
dB
dB
Voltage Gain
GV
BW
Bandwidth
300
kHz
P
OUT=125mW, Vs=6V,f=1kHz
Total Harmonic Distortion
THD
0.2
50
%
RL=8Ω pin1 and pin 8 open
Vss=6V, f=1kHz, CBYPASS=10μF
pin1and pin 8 open, Referred to output
Rejection Ratio
RR
dB
Input Resistance
Input Bias Current
RIN
50
kΩ
nA
IBIAS
Vss=6V Pin2 and pin 3 open
250
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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 by
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 kΩ, 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 kΩ 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.
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LM386
LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATIONS CIRCUIT
AM Radio Power
Amplifier
Vs
0.05μF
R1
10KΩ
10μF
Cc
+
FROM
DETECTOR
6
FERRITE
2
VOL
10KΩ
-
1
BEAD
C1
250μF
+
8
2200pF
5
7
+
8Ω
SPEAKER
3
47
+
4
+
10μF
47Ω
0.05μF
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.
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LM386
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Power Supply Rejection Ratio(Referred
to the Output) vs Frequency
Quiescent Supply Current vs Supply Voltage
60
6
C7=50μF
50
40
30
20
5
4
3
Vs=6V
Av=26dB
1μF
0.5μF
10μF
2
1
NO BYPASSCAPACITOR
10
0
10
100
1K
10K
100K
4
5
6
7
8
9
10 11 12
Frequency (Hz)
Supply Voltage(volts)
Frequency Response With Bass Boost
Peak-to -Peak Output Voltage Swing vs Supply Voltage
27
26
10
RL=∞
16
25
24
23
22
21
8
8
6
4
4
20
19
2
0
18
17
20 50 100 200 500 1K 2K 5K 10K20K
4
5
6
7
8
9
10 11 12
Supply Voltage(volts)
Frequency (Hz)
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LM386
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(cont.)
Device Dissipaton vs Output Power -
Distortion vs Output Power
4ΩLoad
10
2.0
Vs=6V
RL=8Ω
f=1kHz
1.8
1.6
1.4
9
8
7
6
Vs=12V
Vs=9V
1.2
1.0
0.8
3% THD
LEVEL
5
4
0.6
0.4
3
2
1
10%
THD
LEVEL
0.2
0
Vs=6V
0
0
0.1
0.2
0.3
0.4
0.5
0.001
0.01
0.1
1.0
Power Output (Watts)
Output Power (W)
Device Dissipaton vs Output Power -
Device Dissipaton vs Output Power -16ΩLoad
1.0
8ΩLoad
2.0
1.8
1.6
1.4
1.2
1.0
0.8
3% THD
LEVEL
10%
THD
LEVEL
Vs=16V
0.8
Vs=16V
0.6
0.4
Vs=12V
Vs=12V
Vs=9V
10%
THD
LEVEL
0.6
0.4
0.2
0
Vs=9V
Vs=6V
3% THD
LEVEL
0.2
0
Vs=6V
0
0.1 0.2 0.3 0.4 0.5
0.6 0.7 0.8 0.9 1.0
0 0.2 0.4 0.6 0.8 1.0
1.2 1.4 1.6 1.8 2.0
Output Power (W)
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.
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