s ilicore low voltage audio power amplifier D386 d e s c r i p t i o n outline drawing the D386 is a power am plifier designed for use in low voltage consum er 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 from 20 to 200. the inputs are ground referenced while the output autom a tically biases to one-half the supply voltage. the quiescent power drain is only 24 m illiwatts when operating from a 6 volt supply , m a king the lm386 ideal for battery operation. fea t ure battery operation m i n i mu m e x t e r n a l p a r t s wide supply voltage range: 4v?12v low quiescent current drain: 4m a voltage gains from 20 to 200 available in 8 pin dip package a p p l i c a t i o n pin configura tion a m - f m r a d i o a m p l i f i e r s portable tape player am plifiers intercom s tv sound sy stem s line drivers ultrasonic drivers sm all servo drivers power converters shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 1/6 .com .com .com .com 4 .com u datasheet
silicor e D386 equiv a lent schema tic and connection diagrams absolute maximum ra tings (t a=25 c) c h a r a c t e r i s t i c s y m b o l v a l u e u n i t maxim u m input v o ltage v in ? 0.4 v supply v o ltage vcc 15 v maxim u m power disspation p d 6 6 0 m v soldering tem p erature(10 sec.) t s 2 6 0 c junction t e m p erature tj 150 c operating t e m p erature t a m b -10~+70 c s t orage t e m p erature t s tg -40~125 c electrical characteristics (unless otherwise specified: vcc=6v , r l =8 |? , f=1khz , t a m b =25 ?? ) c h a r a c t e r i s t i c s t e s t c o n d i t i o n s sy m bol m i n t y p max u nit operating supply voltage v c c 1 2 v quiescent current vcc=6v ? v in =0 i c c - 4 8 m a vcc=6v , r l =8 ? ? thd=10% 2 5 0 3 2 5 output power vcc=9v , r l =8 ? ? thd=10% po 5 0 0 7 0 0 mw vcc=6v , f=1khz - 26 - voltage gain 1 ??? 8 ????? 10 | f ?y av - 4 6 - db bandwidth vcc=6v ? ?? 1 ? 8 ?aa b w - 3 0 0 - k h z total harm onic distortion vcc=6v ? r l =8 |?? po=125mw ? f=1khz ?? 1 ? 8 ?aa t h d - 0 . 2 - % power supply rejection ratio vcc=6v ? f=1khz ? c byp a s s =1 0 | f ? 1 ? 8 ???aa??3??a2??? p s r r 5 0 d b input resistance r in - 5 0 - k |? input bias current vcc=6v ? 2 ? 3 ???aa i b - 2 5 0 - n a shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 2/6 .com .com .com .com .com 4 .com u datasheet
silicor e D386 applica t ion hints gain control to m a ke the D386 a m o re versatile am plifier, two pins (1and 8) are provided for gain control. with pins 1 and 8 open the 1.35 kw resistor sets the gain at 20 (26 db). if a capacitoris put from pin 1 to 8, by passing the 1.35 kw 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 com ponents can be placed in parallel with the internal feedback resistors to tailor the gain and frequency response for individual applications. for exam ple, we can com p ensate 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 kw resistor). for 6 db effective bass boost: r . 15 kw, the lowest value for good stable operation is r = 10 kw if pin 8 is open. if pins 1 and 8 are by passed then r as low as 2 kw can be used. this restriction is because the am plifier is only com p ensated for closed-loop gains greater than 9. input biasing the schem a tic shows that both inputs are bi ased to ground with a 50 kw resistor. the base current of the input transistors is about 250 na, so the inputs are at about 12.5 m v when left open. if the dc source resistance driving the D386 is higher than 250 kw it will contribute very little additional offset (about 2.5 m v at the input, 50 m v at the output). if the dc source resistance is less than 10 kw, then shorting the unused input to ground will keep the offset low (about 2.5 m v at the input, 50 m v at the output). for dc source resistances between these values we can elim inate excess offset by putting a resistor from the unused input to ground, equal in value to the dc source resistance. of course all offset problem s are elim inated if the input is capacitively coupled. when using the D386 with higher gains (by p a ssing the 1.35 kw resistor between pins 1 and 8) it is necessary to by pass 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. shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 3/6 .com .com .com .com .com 4 .com u datasheet
silicor e D386 applica t ion circuit 10k 0.05uf 250uf 10 - + 6 1 8 5 7 4 3 2 vi n vs d 386 10k 0.05uf 250uf 10 - + 6 1 8 5 7 4 3 2 vin vs D386 10uf ??a fig1 am plifier with gain = 20 fig2 am plifier with gain = 200 ( m i n i m u m p a r t s ) 220 0. 05uf 250uf 10 - + 6 1 8 5 7 4 3 2 ??? vs D386 10uf ??a rl 390 0. 01uf 4. 7k vo 10k 0.05uf 250uf 10 - + 6 1 8 5 7 4 3 2 vin vs d 386 10uf ??a 1.2k fig3 am plifier with gain = 50 fig4 low distortion power wienbridge oscillator 50uf - + 6 1 8 5 7 4 3 2 vs D386 rl 30k 0.1uf 1k vo 10k 10k 0.05uf 250uf 10 - + 6 1 8 5 7 4 3 2 vi n vs D386 ??a rl 10k 0.033uf vo fig5 am plifier with bass boost fig6 square wave oscillator shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 4/6 .com .com .com .com .com 4 .com u datasheet
silicor e D386 10k 0.05uf 250uf 10k - + 6 1 8 5 7 4 3 2 vi n vs D386 10uf 0.05uf 2200pf cc vol 10uf 47 ?????| 8 ?? f i g 7 a m r a d i o p o w e r a m p l i f i e r typical performance characteristics shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 5/6 .com .com .com .com .com 4 .com u datasheet
silicor e D386 shaoxing silicore technology co.,ltd www . silicore. com . cn chmc 6/6 .com .com .com .com 4 .com u datasheet
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