sgplm386
SGPLM386
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
RoHS Compliant Product
A suffix of “-C” specifies halogen and lead-free
DESCRIPTION
The SGPLM386 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 SSGPLM386 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)
DIP-8
A
B
D
F
E
C
J
G
K
M
APPLICATIONS
H
AM-FM radio amplifiers
Portable tape player amplifiers
Intercoms
TV sound systems
Line drivers
Ultrasonic drivers
Small servo drivers
Power converters
REF.
EQUIVALENT SCHEMATIC AND CONNECTION DIAGRAM
A
B
C
D
E
F
L
Millimeter
Min.
Max.
9.017
10.16
10.92
2.921
4.953
6.096
7.112
0.762
1.143
0.356
0.559
REF.
G
H
J
K
L
M
Millimeter
Min.
Max.
0.381
1.143
1.778
2.540 TYP.
7.620
8.255
0.203
0.358
9.144
ABSOLUTE MAXIMUM RATINGS 2
SYMBOL
VALUE
Supply Voltage
PARAMETER
VCC
15
V
Power Dissipation
PD
1.25
W
Input Voltage
Operation Temperature
Storage & Junction Temperature
17-Dec-2009 Rev. A
UNIT
Vi
-0.4~0.4
V
TOPR
0~70
°C
TSTG, TJ
-65~150, 150
°C
Page 1 of 6
SGPLM386
Low Voltage Audio Power Amplifier
Elektronische Bauelemente
ELECTRICAL CHARACTERISTICS 1, 2 ( TA=25 °C, unless otherwise specified)
CHARACTERISTICS
SYMBOL
MIN
Operating Supply Voltage
VS
Quiescent Current
IQ
Output Power
PO
TYP
MAX
4
-
12
V
-
4
8
mA
230
-
-
480
-
-
-
26
-
-
46
-
mW
TEST CONDITIONS
VS=6V, VIN=0
VS=6V, RL=8Ω, THD=10%
VS=9V, RL=8Ω, THD=10%
dB
VS=6V, f=1kHz
10µF from Pin1 to Pin8
-
kHz
VS=6V, Pin1 to Pin8 open
0.2
-
%
PO=125mW, VS=6V, f=1kHz
RL=8Ω, Pin1 to Pin8 open
50
-
dB
VS=6V, f=1kHz, CBYPASS=10µF
Pin1 to Pin8 open, Referred to output
-
50
-
KΩ
-
250
-
nA
Voltage Gain
GV
Bandwidth
BW
-
300
Total Harmonic Distortion
THD
-
PSRR
-
Input Resistance
RIN
Input Bias Current
IBIAS
Power Supply Rejection Ration
UNITS
VS=6V, Pin2 to Pin3 open
Note:
1. All voltages are measured with respect to the ground pin, unless otherwise specified.
2. Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which
the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications
under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings.
Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device
performance.
3. For operation in ambient temperatures above 25°C , the device must be derated based on a 150°C maxim um junction temperature and 1) a
thermal resistance of 107°C /W, junction to ambient for the dual-in-line package and 2)a thermal resistance of 170°C /W for the small outline
package.
APPLICATION HINTS
GAIN CONTROL
To make the SGPLM386 a more versatile amplifier, two pins (1 and 8) are provided for gain control. With pins 1 and
8 open the 1.35KΩ resistor sets the gain at 20 (26dB),If a capacitor is put from pin 1 to 8,bypassing the 1.35kΩ 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) prom 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 15kΩ
resistor). For 6 dB effective bass boost: R=15kΩ, the lowest value for good stable operation in R=10k, if pin 8 is open, If
pins 1 and 8 are bypassed then R as low as 2kΩ can be used. This restriction is because the amplifier is only
compensated for closed-loop gains greater than 9.
INPUT BIASING
The schematic show that both input are biased to ground with a 50kΩ 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
SGPLM386 is higher than 250kΩ 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 10k, then shorting the unused input to ground will keep the offset low
(about 2.5mW at the input, 50mW at the output). For dc source resistance 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 SGPLM386 with higher gains (bypassing the 1.35kΩ resistor between pin1 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.
17-Dec-2009 Rev. A
Page 2 of 6
SGPLM386
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
17-Dec-2009 Rev. A
Page 3 of 6
SGPLM386
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
TYPICAL PERFORMANCE CHARACTERISTICS
17-Dec-2009 Rev. A
Page 4 of 6
SGPLM386
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
TYPICAL APPLICATIONS
17-Dec-2009 Rev. A
Page 5 of 6
SGPLM386
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
TYPICAL APPLICATIONS
Note:
4. Twist supply lead and supply ground very tightly.
5. Twist speaker lead and ground very tightly.
6. Ferrite bead in Ferroxcube K5-001-001/3B with 3 turns of wire.
7. R1C1 band limits input signals.
8. All components must be spaced very closely to IC.
17-Dec-2009 Rev. A
Page 6 of 6
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