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SPWLM386D
Low Voltage Audio Power
Elektronische Bauelemente
RoHS Compliant Product
Amplifier
Description
The SPWLM386D 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 addittion 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 input are ground referenced while the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 millwatts when operating from a 6 voltage supply, marking the SPWLM386D ideal for battery operation.
DIP-8
D
GAUGE PLANE
E
A
Features
* Ground Referenced Input * Low Quiescent Current Drain: 4mA
SEATING PLANE Z Z
b
L
SECTION Z - Z
b
e
* Wide Supply Voltage Range: 4V~12V * Voltage Gains: 20~200 * Low Distortion: 0.2% ( Av=20, Vs=6V, RL=8[ , Po=125mW, f=1 kHz) * Self-Centering Output Quiescent Voltage * Battery Operation * Minimum External Parts
REF. A A1 A2 b b1 b2 b3 c Millimeter Min. Max. REF. c1 D E E1 e HE L Millimeter Min. Max.
Applications
* Line Drivers * Power Converters
0.381 2.921 0.356 0.356 1.143 0.762 0.203
0.5334 4.953 0.559 0.508 1.778 1.143 0.356
0.203 0.279 9.017 10.16 6.096 7.112 7.620 8.255 2.540 BSC 10.92 2.921 3.810
* Small Servo Drivers * Intercoms * Ultrasonic Drivers * AM-FM Radio Amplifiers * Portable Tape Player Amplifiers * TV sound Systems
rogrammed by pacitor CT to ground .Operation 500kHz nts up to
Equivalent Schematic and Connection Diagram
This is the reference output .It provides charging current for capacitor CT
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01-Jun-2002 Rev. A
c
Page 1 of 6
SPWLM386D
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
Abs olute Maximum R atings
P arameter
Supply Voltage Power Dissipation Input Voltage Operating Temperature Storage Temperature Junction Temperature
(Note 2)
S ymbol VCC Pd Vi Topr Tstg Tj
(TA=25 : Note1, 2)
Value 15 1.25 -0.4 ~ +0.4 0 ~ 70 -65 ~ 150 150
Min 4 230 480 Typ. 4 26 46 300 0.2 50 50 250
Unit V W V : : :
Max. 12 8 Unit V mA mW dB kHz % dB k nA
Electrical Characteristics
Parameter Operating Supply Voltage Quiescent Current Output Power Voltage Gain Bandwidth Total Harmonic Distortion Power Supply Rejection Ration Input Resistance Input Bias Current
Symbol Test Conditions VS IQ VS=6V, VIN=0 VS=6V, RL=8 , THD=10% PO VS=9V, RL=8 , THD=10% VS=6V, f=1kHz GV 10 F form Pin1 to Pin8 BW VS=6V, Pin1 to Pin8 open PO=125mW, VS=6V, f=1kHz THD RL=8 , Pin1 to Pin8 open PSRR RIN IBIAS
VS=6V, f=1kHz, CBYPASS=10 F Pin1 and Pin8 open, Referred to output
VS=6V, Pin2 to Pin3 open
Note1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note2: 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. this pin (with a 5.0uF capacitor at Pin 2) Note3: For operation in ambient temperatures above 25 : , the device must be derated based onon 150 : of the circuit is affected by the a time maximum junction temperature and 1) a thermal resistance of 107 : /W, junction to ambient for the dual-in-line package and 2)a thermal resistance of 170 : /W for the small outline package. nd resistor set low frequency rolloff and input impedance. The
Application Hints
Gina Control To make the SPWLM386D a more versatile amplifier, two pins (1 and 8) are provided for gain control. With pins 1 and 8 open the 1.35K resistor sets the gain at 20 (26dB),If a capacitor is put from pin 1 to 8,bypassing the 1.35k 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 15k resistor). For 6 dB effective bass boost: R=15k , the lowest value for can be used. This restriction is good stable operation in R=10k , if pin 8 is open, If pins 1 and 8 are bypassed then R as low as 2k 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 50k 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 SPWLM386D is higher than 250k 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 SPWLM386D with higher gains (bypassing the 1.35k 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 0.1 F capacitor or a short to ground depending on the
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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
dc source resistance on the driven input.
Any changing of specification will not be informed individual
01-Jun-2002 Rev. A
Page 2 of 6
SPWLM386D
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
Typical Performance Characteristics
(UVLO)
Fig 1. Quiescent Supply Current vs. Supply Voltage
Fig 2. Power Supply Rejection Ratio (Referred to the output) vs. Frequency
Fig 3. Peak-to-Peak Voltage Swing vs. Supply Voltage
Fig 4. Voltage Gain vs. Frequency
Fig 5. Distortion vs. Frequency
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Fig 6. Distortion vs. Output Power
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01-Jun-2002 Rev. A
Page 3 of 6
SPWLM386D
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
Fig 7. Device Dissipation vs. Output Power -4 L Load
Fig 8. Device Dissipation vs. Output Power -8 L Load
Fig 9. Device Dissipation vs. Output Power -16 L Load
Fig 10. Frequency Response with Bass Boost
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01-Jun-2002 Rev. A
Page 4 of 6
SPWLM386D
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
Typical Applications
Amplifier with Gain=20 Minimum Parts
Amplifier with Gain=200
Amplifier with Gain=50
Low Distortion Power Wienbridge Oscillator
Amplifier with Bass Boost
Square Ware Oscillator
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01-Jun-2002 Rev. A
Page 5 of 6
SPWLM386D
Elektronische Bauelemente
Low Voltage Audio Power Amplifier
AM Radio Power Amplifier
Note4: Twist supply lead and supply ground very tightly. Note5: Twist speaker lead and ground very tightly. Note6: Ferrite bead in Ferroxcube K5-001-001/3B with 3 turns of wire. Note7: R1C1 band limits input signals. Note8: All components must be spaced very closely to IC.
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01-Jun-2002 Rev. A
Page 6 of 6

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