ChipFind - Manufacturer datasheet and components documentation

ChipFind - Manufacturer datasheet and components documentation
PJ386
Low Voltage Audio Power Amplifier
T
he PJ386 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 up to 200.
The inputs are ground referenced while the output is
automatically biased to one half the supply voltage.The
quiescent power drain is only 24 milliwatts when operating
from a 6 volt supply,making the PJ386 ideal for battery
operation.
FEATURES
•
•
•
•
•
•
•
•
•
DIP-8
Battery operation
Minimum external parts
Wide supply voltage range 4-12 Volt
Low quiescent current drain 4mA
Voltage gains from 20 to 200
Ground referenced input
self-centering output quiescent voltage
Low distortion
Eight pin dual-in-line package
SOP-8
Pin : 1. Gain
2. -Input
3. +Input
4. Gnd
APPLICATIONS
•
•
•
•
•
•
•
•
AM-FM radio amplifiers
Portable tape player amplifiers
Intercoms
TV sound systems
Line drivers
Ultrasonic drivers
Small servo drivers
Power converters
5. Output
6. V+
7. Bypass
8. Gain
ORDERING INFORMATION
Device
Operating Temperature
Package
PJ386CD
-20 oC TO +85 oC
DIP-8
PJ386CS
SOP-8
EQUIVALENT CIRCUIT
1-6
2003/10.ver.A
PJ386
Low Voltage Audio Power Amplifier
ABSOLUTE MAXIMUM RATINGS (TA=25℃)
Characteristic
Supply Voltage
Power Dissipation
Symbol
Value
Unit
V+
PD
15
700
300
0.4
-20 ~ +85
-40 ~ +125
V
mW
DIP-8
SOP-8
Input Voltage Range
Operating Temperature Range
Storage Temperature Range
Vin
Topr
Tstg
V
C
o
C
o
ELECTRICAL CHARACTERISTICS (TA=25℃)
Parameter
Conditions
Quiescent Circuit Current(IQ)
Output Power (POUT )
Voltage Gain (Av)
D-Type
Bandwidth (BW) D-Type
Total Harmonic Distortion(THD)
(D-Type)
Power Supply Rejection Ratio
(PSRR)
Input Resistance (RIN)
Input Bias Current (IBIAS)
VIN =0
Vs =6V , RL=8,THD=10%
Vs= 9V , RL=8,THD=10%
Vs=6V,f=1KHz
10μF from Pin 1 to 8
VS =6V, Pins 1 and 8 Open
10μF from Pin 1 to 8
VS =6V, RL=8,POUT=125mW
f=1KHz, Pins 1 and 8 open
VS=6V,f=1KHz, CBY PASS=10μF
Pins 1 and 8 Open, Referred to Output
Min.
Typ.
Max.
Units
4
325
700
26
46
300
60
0.2
8
mA
mW
mW
dB
dB
KHz
250
500
VS =6V,Pins 2 and 3 Open
%
50
dB
50
250
KΩ
nA
(note 1) Set the maximum junction temperature to 125℃ and reduce the thermal resistance to 143℃/W when the ambient
temperature is high.
(note 2) Insert a 10Ωresistor and 0.05μF capacitor in series to ground terminal from pin 5.
TYPICAL APPLICATION
PJ386
PJ386
2-6
2003/10.ver.A
PJ386
Low Voltage Audio Power Amplifier
Low Distortion Power Wienbrige Oscillator
Amplifier with Bass Boost
TYPICAL CHARACTERISTICS
(Ta=25℃)
Square Wave Oscillator
Amplifier 2
APPLICATION HINTS
GAIN CONTROL
To make the PJ386 a more versatile amplifier, two pins ( 1 and 8 ) are provided for gain control. With pins 1 to 8 open the
1.35KΩ 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 (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 frequen-cy
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 values for good stable operation is Rmin=10 KΩ if pin 8 is open.If pins 1 and 8 are bypassed
then R as low 2 KΩ can be used. This restriciton 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 12.5mV when left open. If the dc source resistance driving the PJ386 is higher than 250
KΩ it will contribute very little additional offset (about 2.5mV at the input, 50mV 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 , 50mV 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 PJ386 will 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.
3-6
2003/10.ver.A
PJ386
Low Voltage Audio Power Amplifier
Quiescent Current vs. Supply Voltage
Maximum Output Voltage Swing vs. Supply Voltage
Voltage Gain vs. Frequency
Power Supply Rejection Ratio vs. Frequency
(V+=6V,Av=26dB)
Total Harmonic Distortion vs. Frequency
(V+ =6V, RL=8Ω, Po=125mW,Av=26dB)
Total Harmonic Distortion vs. Output Power
(V+ =6V, RL=8Ω, f=1KHz)
4-6
2003/10.ver.A
PJ386
Low Voltage Audio Power Amplifier
Power Dissipation vs. Output Power(RL=4Ω)
Power Dissipation vs. Output Power(RL=8Ω)
Power Dissipation vs. Output Power(RL=16Ω)
Frequency Response with Base Boost
Power Dissipation vs. AmbientTemperature
5-6
2003/10.ver.A
PJ386
Low Voltage Audio Power Amplifier
6-6
DIM
A
B
C
D
G
J
K
L
M
MILLIMETERS
MIN
MAX
9.07
9.32
6.22
6.48
3.18
4.43
0.35
0.55
2.54BSC
0.29
0.31
3.25
3.35
7.75
8.00
10°
INCHES
MIN
MAX
0.357
0.367
0.245
0.255
0.125
0.135
0.019
0.020
0.10BSC
0.011
0.012
0.128
0.132
0.305
0.315
10°
DIM
A
B
C
D
F
G
K
M
P
R
MILLIMETERS
MIN
MAX
4.80
5.00
3.80
4.00
1.35
1.75
0.35
0.49
0.40
1.25
1.27BSC
0.10
0.25
0°
7°
5.80
6.20
0.25
0.50
INCHES
MIN
MAX
0.189
0.196
0.150
0.157
0.054
0.068
0.014
0.019
0.016
0.049
0.05BSC
0.004
0.009
0°
7°
0.229
0.244
0.010
0.019
2003/10.ver.A
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