technical data 2012, february, ver. 0 3 low voltage audio power amp the IL386 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 vol tage. the quiescent power drain is only 24 m w when operating from a 6 volt supply, making the IL386 ideal for battery operation. features ? battery operation ? minimum external parts ? wide supply voltage range: 4 v - 12 v ? low quiescent current drain: 4 ma ? volt age gains from 20 to 200 ? ground referenced input ? self - centering output quiescent voltage ? low distortion ? eight pin dual - in - line package schematic diagram IL386 ordering information IL386n plastic IL386d soic t a = 0 ? to 70 ? c for all package pin assignment ordering information device operating temperature range package packing IL386n t a = 0 ? to 70 ? c dip - 8 tube IL386d so - 8 tube IL386dt so - 8 tape & reel
il3 86 2012, february, ver. 0 3 maximum ratings * symbol parameter value unit v cc supply voltage 15 v v in input voltage ? 0.4 v p d power dissipation 1.25 w tstg storage temperature - 65 to +150 ? c t j junction temperature +150 ? c t l lead temperature +300 ? c * stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. exposure to absolute - maximum - rated conditions for extended periods may affect device reliability. recommended operating conditions symbol parameter min max unit v cc supply voltage 4.0 12 v t a operating temperature, all package types 0 +70 ? c this device contains protection circuitry to guard against damage due to high static voltages or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high - impedance circuit. for proper operation, v in and v out should be constrained to th e range gnd ? (v in or v out ) ? v cc . unused inputs must always be tied to an appropriate logic voltage level (e.g., either gnd or v cc ). unused outputs must be left open. electrical characteristics (t a = 25 ? c) symbol parameter test conditions guaranteed lim its unit min typ max v + operating supply voltage 4 12 v i + quiescent current v + = 6 v, v in = 0 8 ma p o output power v + = 6v, r l =8 ? , thd=10% v + = 9v, r l =8 ? , thd=10% 250 500 325 1000 mw a v voltage gain v + = 6v, f=1khz 10 ? f from pin 1 and 8 24 44 26 46 28 48 db bw bandwidth v + = 6v, pins 1 and 8 open 250 khz thd total harmonic distortion v + = 6v, r l =8 ? , p out =125mw, f=1khz, pins 1 and 8 open 1.0 % psrr power supply rejection ratio v + = 6v, f=1khz, c bypass =10 ? f, pins 1 and 8 open 45 db r in input resistance 30 130 k ? i b input bias current v + = 6v, pins 2 and 3 open 250 400 na
il3 86 2012, february, ver. 0 3 electrical characteristics (t a = 0 ~ 70 ? c) symbol parameter test conditions guaranteed limits unit min typ max v + operating supply voltage 4 12 v i + quie scent current v + = 6 v, v in = 0 8 ma p o output power v + = 6v, r l =8 ? , thd=10% v + = 9v, r l =8 ? , thd=10% 220 480 325 1000 mw a v voltage gain v + = 6v, f=1khz 10 ? f from pin 1 and 8 22 42 26 46 30 50 db bw bandwidth v + = 6v, pins 1 and 8 open 250 khz thd t otal harmonic distortion v + = 6v, r l =8 ? , p out =125mw, f=1khz, pins 1 and 8 open 1. 5 % psrr power supply rejection ratio v + = 6v, f=1khz, c bypass =10 ? f, pins 1 and 8 open 45 db r in input resistance 20 150 k ? i b input bias current v + = 6v, pins 2 and 3 open 250 600 na application information gain control to make the IL386 a more versatile amplifier, two pins (1 and 8) are provided for gain control. with pins 1 and 8 open the 1.35 k ? resistor sets the gain at 20 (26 db). if a capacitor is put from pin 1 to 8, bypassing the 1.35 k ? 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 freque ncy shaping the feeback path. this is done with a series rc from pin 1 to 5 (paralleling the internal 15 k ? resistor). for 6 db effective bass boots: r ? 15 k ? , the lowest value for good stable operation is r=10 k ? if pin 8 is open. if pins 1 and 8 are bypas sed then r as low as 2 k ? can be used. this restriction is because the amplifier is only compensated for closed - loop gains greater the 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 250 na, so the inputs are at at out 12.5 mv when left open. if the dc source resistance oriving the IL386 is higher than 250 k ? 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 k ? , 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 unesed input to ground, equal in value to the dc source resistance. of course all affset problems are eliminated if the input is capacitively coupled. when using the IL386 with higher gains (by pessing the 1.35 k ? 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 ? f capacitor or a short to ground depending on the dc source resistance on the driven input.
il3 86 2012, february, ver. 0 3 typical performance characteristics
il3 86 2012, february, ver. 0 3 typical application
il3 86 2012, february, ver. 0 3 n suffix plastic dip (ms C 001ba) symbol min max a 8.51 10.16 b 6.1 7.11 c 5.33 d 0.36 0.56 f 1.14 1.78 g h j 0 10 k 2.92 3.81 notes: l 7.62 8.26 1. ???? dimensions a, b do not include mold flash or protrusions. m 0.2 0.36 maximum mold flash or protrusions 0.25?mm (0.010) per side. n 0.38 d suffix soic (ms - 012aa) symbol min max a 4.8 5 b 3.8 4 c 1.35 1.75 d 0.33 0.51 f 0.4 1.27 g h j 0 8 notes: k 0.1 0.25 1. ???? dimensions a and b do not include mold flash or protrusion. m 0.19 0.25 2. ???? maximum mold flash or protrusion 0.15?mm (0.006) per side p 5.8 6.2 for a; for b ? 0.25?mm (0.010) per side. r 0.25 0.5 1.27 5.72 dimension, mm dimension, mm 2.54 7.62 a b h c k c m j f m p g d r x 45 seating plane 0.25 (0.010) m t -t- 1 8 4 5 l h m j a b f g d seating plane n k 0.25 (0.010) m t -t- c 1 8 4 5
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