SPWLM386D Low Voltage Audio Power Elektronische Bauelemente Amplifier RoHS Compliant Product DIP-8 Description D c A E GAUGE PLANE 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. Features SEATING PLANE b Z L Z * Ground Referenced Input * Low Quiescent Current Drain: 4mA SECTION Z - Z e b * Wide Supply Voltage Range: 4V~12V * Voltage Gains: 20~200 REF. * Low Distortion: 0.2% ( Av=20, Vs=6V, RL=8Ω , Po=125mW, f=1 kHz) * Self-Centering Output Quiescent Voltage A A1 A2 b b1 b2 b3 c * Battery Operation * Minimum External Parts Applications Millimeter Min. Max. 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 REF. c1 D E E1 e HE L Millimeter Min. Max. 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 * Line Drivers * Power Converters * Small Servo Drivers * Intercoms * Ultrasonic Drivers * AM-FM Radio Amplifiers * Portable Tape Player Amplifiers rogrammed by pacitor CT to ground .Operation 500kHz * TV sound Systems Equivalent Schematic and Connection Diagram nts up to This is the reference output .It provides charging current for capacitor CT http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 1 of 6 SPWLM386D Low Voltage Audio Power Elektronische Bauelemente Abs olute Maximum R atings (Note 2) P arameter S ymbol VCC Pd Vi Topr Tstg Tj Supply Voltage Power Dissipation Input Voltage Operating Temperature Storage Temperature Junction Temperature 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 Amplifier (TA=25 Value 15 1.25 -0.4 ~ +0.4 0 ~ 70 -65 ~ 150 150 Unit V W V Note1, 2) 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 VS=6V, f=1kHz, CBYPASS=10 F Pin1 PSRR and Pin8 open, Referred to output RIN IBIAS VS=6V, Pin2 to Pin3 open Min 4 230 480 Max. 12 8 - Unit V mA - dB - Typ. 4 26 46 300 - kHz - 0.2 - % - 50 - dB - 50 250 - k nA - mW 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 a 150 maximum junction temperature time of the circuit is affected by the 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 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 15k resistor). For 6 dB effective bass boost: R=15k , 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 2k 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 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 dc source resistance on the driven input. http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 2 of 6 SPWLM386D Elektronische Bauelemente Low Voltage Audio Power Amplifier Typical Performance Characteristics (UVLO) ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A 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 Fig 6. Distortion vs. Output Power Any changing of specification will not be informed individual Page 3 of 6 SPWLM386D Low Voltage Audio Power Elektronische Bauelemente Fig 7. Device Dissipation vs. Output Power -4 Fig 9. Device Dissipation vs. Output Power -16 http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Amplifier Load Load Fig 8. Device Dissipation vs. Output Power -8 Load Fig 10. Frequency Response with Bass Boost Any changing of specification will not be informed individual Page 4 of 6 SPWLM386D Elektronische Bauelemente Low Voltage Audio Power Amplifier Typical Applications Amplifier with Gain=20 Minimum Parts Amplifier with Gain=50 Amplifier with Bass Boost http://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Amplifier with Gain=200 Low Distortion Power Wienbridge Oscillator Square Ware Oscillator Any changing of specification will not be informed individual Page 5 of 6 SPWLM386D Low Voltage Audio Power Elektronische Bauelemente 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. ht tp://www.SeCoSGmbH.com/ 01-Jun-2002 Rev. A Any changing of specification will not be informed individual Page 6 of 6