D386 [ETC]
Low Voltage Audio Power Amplifier; 低电压音频功率放大器
| 型号： | D386 |
| 厂家： | 
ETC |
| 描述： | Low Voltage Audio Power Amplifier |
| 文件： | 总6页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Silicore
Low Voltage Audio Power Amplifier D386
DESCRIPTION
Outline Drawing
The D386 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.
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 LM386 ideal for battery
operation.
FEATURE
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ꢀ
ꢀ
ꢀ
ꢀ
Battery operation
Minimum external parts
Wide supply voltage range: 4V–12V
Low quiescent current drain: 4mA
Voltage gains from 20 to 200
Available in 8 pin DIP package
APPLICATION
PIN CONFIGURATION
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
AM-FM radio amplifiers
Portable tape player amplifiers
Intercoms
TV sound systems
Line drivers
Ultrasonic drivers
Small servo drivers
Power converters
1/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
Silicore
D386
EQUIVALENT SCHEMATIC AND CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS (Ta=25°C)
Characteristic
Maximum Input Voltage
Supply Voltage
Maximum Power Disspation
Soldering temperature(10 sec.)
Junction Temperature
Operating Temperature
Storage Temperature
Symbol
VIN
Vcc
PD
TS
Tj
Tamb
Tstg
Value
±0.4
15
660
260
150
-10~+70
-40~125
Unit
V
V
mV
°C
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified: Vcc=6V , RL=8Ω , f=1kHz , Tamb=25℃ )
Characteristics
Operating Supply
Voltage
Test conditions
Symbol Min
Vcc
Typ Max Unit
12
8
V
Quiescent Current
Vcc=6V， VIN=0
Icc
Po
-
4
mA
Vcc=6V, RL=8Ω， THD=10%
Vcc=9V, RL=8Ω， THD=10%
Vcc=6V, f=1kHz
1 脚 、 8 脚 接 10μ F
Vcc=6V， 脚 1、 8 开 路
250
500
325
700
26
46
300
Output Power
mW
-
-
-
-
-
-
Voltage Gain
Bandwidth
Av
dB
容
BW
kHz
Vcc=6V， RL=8Ω ， Po=125mW，
f=1kHz
脚 1、 8 开 路
Total Harmonic
Distortion
THD
-
0.2
-
%
Vcc=6V，f=1kHz，CBYPASS=10μ
Power Supply
Rejection Ratio
PSRR
50
dB
F， 1、 8 脚 开 路 、
出
参 考
Input Resistance
RIN
-
-
50
250
-
-
kΩ
nA
Input Bias Current
Vcc=6V， 2、 3 脚 开 路
IB
2/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
Silicore
D386
APPLICATION HINTS
GAIN CONTROL
To make the D386 a more versatile amplifier, two pins (1and 8) are provided for gain
control. With pins 1 and 8 open the 1.35 kW resistor sets the gain at 20 (26 dB). If a
capacitoris put from pin 1 to 8, bypassing the 1.35 kW 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 kW resistor).
For 6 dB effective bass boost: R . 15 kW, the lowest value for good stable operation is R =
10 kW if pin 8 is open. If pins 1 and 8 are bypassed then R as low as 2 kW 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 kW 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 D386 is higher than 250 kW 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 kW, 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 the D386 with higher gains (bypassing the 1.35 kW 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 µF capacitor or a short to ground depending
on the dc source resistance on the driven input.
3/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
Silicore
D386
APPLICATION CIRCUIT
Vs
Vs
1
6
6
-
1
10uF
-
8
2
8
250uF
10
5
2
250uF
5
Vin
Vin
D386
4
D386
4
0.05uF
10
+
0.05uF
7
10K
7
+
10K
3
3
旁路
Fig1 Amplifier with Gain = 20
(Minimum Parts)
Fig2 Amplifier with Gain = 200
Vs
10uF
6
-
Vs
1
390
1.2K
6
-
8
2
3
250uF
10uF
5
1
5
Vo
D386
8
2
3
0.05uF
250uF
10
7
220
阻
RL
+
Vin
10
敏
D386
ÅÔ·
4
0.05uF
+
7
10K
0.01uF
4.7K
4
旁路
Fig3 Amplifier with Gain = 50
Fig4 Low Distortion Power
Wienbridge Oscillator
Vs
6
Vs
1
6
-
旁路
7
30K
2
-
2
3
8
0.1uF
50uF
Vo
RL
250uF
5
D386
Vo
5
Vin
D386
+
7
4
1
+
10K
RL
3
10
8
4
10K
1K
10K
Fig5 Amplifier with Bass Boost
Fig6 Square Wave Oscillator
4/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
Silicore
D386
Vs
0.05uF
Cc
6
Vin
1
10uF
10K
2
-
VoL
10K
8
氧体 圈
250uF
2200pF
D386
5
8
喇叭
47
7
+
0.05uF
3
10uF
4
Fig7 AM Radio Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
5/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
Silicore
D386
6/6
SHAOXING SILICORE TECHNOLOGY CO.,LTD
www. Silicore. com. cn
CHMC
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