ksd-i5o006-003 1 S8200 linear led driver ic ? description the S8200 is an integrated adjustable constant-current source, driving load s up to 150ma, the output current level can be adjusted via an external resistor. the integr ated shdn input of the S8200 permits led brightness regulation by pulse width modulation (pwm), with the shdn input, the led brightness can be regulated via duty cycle. also, shdn low sets the S8200 in sleep mode, the shdn pin also can be used as an enable input. this discrete integration technology eliminates individual components by combining them into a single package, which results in a significant reduction of both system co st and board space. the device is a small surface mount package (sot-25) ? features ? supplies stable bias current for leds ? led drive current adjustable via si ngle external resistor (max 150ma) ? low cost, low external parts count ? small surface-mount sot-25 package ? halogen-free package is available package type device name marking sot-25 S8200 82 : yar&wk o pin symbol description 1 fb feedback / 0.6v reference 2 gnd ground 3 shdn disable on/off 4 vcc power supply 5 output open collector output ? ??? ? ? pin assignment & description package : sot-25 ? ordering information shdn gnd fb vcc output
ksd-i5o006-003 2 ? absolute maximum ratings [ta=25 ] characteristic symbol rating unit power supply voltage v cc(max) 25 v output voltage v out(max) 25 v output sink current i out(max) 150 ma thermal resistance junction-ambient rth(j-a) * 250 /w power dissipation p d * 0.5 w operating temperature range t opr -40 ~ +85 storage temperature range t stg -55 ~ +125 * mounted on a glass epoxy circuit board of 30x30mm pad dimension of 50mm 2 ? recommended operating conditions characteristic symbol rating unit min max power supply voltage v cc 3 24 v output voltage v out 1.5 vcc v output sink current i out - 100 ma shut down voltage shdn -0.3 vcc v dimming frequency (shdn) f dim - 10 khz ? electrical characteristics (ta=25 , unless otherwise noted.) characteristic symbol condi tion min. typ. max. unit supply current 1 i q1 v cc =5v, iout=10ma , vout=open - 2.0 3.0 ma supply current 2 i q2 v cc =22v, iout=10ma , vout=open - 2.2 3.5 ma vo leak current ileak vcc=5v, vout=22v - 0.1 1 a feedback voltage v fb v cc =5v, iout=10ma 586 600 614 mv dropout voltage vdrop v cc =5v, iout=100ma - 0.8 1.5 v line regulation v fb1 v cc =3v~22v, iout=10ma - 3 10 mv load regulation v fb2 v cc =5v, iout=1ma~100ma - 2 10 mv shdn voltage on vdis on v cc =5v, iout=10ma , vo u t = v c c 1.5 - - v shdn voltage off vdis off v cc =5v, iout=10ma , vo u t = v c c - - 0.5 v shdn pin current idis vcc=5v, shdn=5v 230 430 630 a short circuit current i sc r fb =0 ? - 250 - ma S8200
ksd-i5o006-003 3 S8200 ? functional block diagram ? design consideration 1) calculation for r fb - r fb = 0.6v / i led 2) calculation for vdrop - vdrop = v cc C v led 3) calculation for power dissipation on the S8200 -p d1 = (vdrop C v fb ) x i led -p d2 = v cc x i q -p d(total) = p d1 + p d2 4) if does not use an dimming function, connect shdn pin with the ground. + - ocp gnd fb out vcc shdn 0.6v
ksd-i5o006-003 4 S8200 ? typical applications 5 4 1 2 3 output vcc fb gnd shdn r fb pwm signal vs S8200 5 4 1 2 3 output vcc fb gnd shdn r fb v s S8200 i led =0.6v / r fb 5 4 1 2 3 output vcc fb gnd shdn r fb ac input (12v / 60hz) 220 f S8200 sdb1040
ksd-i5o006-003 5 S8200 S8200 (1) > for operation in excess of S8200 specified maximum voltage (v cc & v out ) of 25v, one way is to connect a sufficient number of leds between the power supply voltage and the dc input of the v cc &v out (pin 4, 5) such that the voltage seen at pin 4, 5 is less than 25v. that is to say, use additional leds to drop the voltage fed to the s 8200 below its maximum rating, in the usual way. refer to app4,5 note that the exact num ber of diodes required will depend on the supply voltage v cc and output voltage v out ,the voltage drops across the particular leds being used. (red, blue and white leds have different forward voltage drop.) use enought leds such that volt age at pin4,5 of S8200 is < 25v attention : when v s uses to exceed 25v, dimming functions the use is impossible. S8200 (2) > ? typical applications 5 4 1 2 3 output vcc fb gnd shdn r fb v s > 25v S8200 d 1 d 2 d n 5 4 1 2 3 output vcc fb gnd shdn r fb v s > 25v S8200 d 1 d 2 d n-1 d n
ksd-i5o006-003 6 S8200 ? typical applications S8200 > 5 4 1 2 3 output vcc fb gnd shdn r fb v s > 25v S8200 d 1 d 2 d n ra rb
ksd-i5o006-003 7 S8200 r f = ? = = r f = ? cc= cc= cc= r f = ? o = o e = i = = r f = ? = r f = ? ? electrical characteristic curves fig.1 v fb vs t a feedbak voltage change - v fb [%] ambient temperature - t a [ ] fig.2 line regulation vs t a line regulation- v fb [mv] ambient temperature - t a [ ] fig.3 load regulation vs t a load regulation- v fb [mv] ambient temperature - t a [ ] fig.4 quiescent current vs t a quiescent current - i [ma] ambient temperature - t a [ ] fig.5 dropout voltage vs t a dropout voltage- v drop [mv] ambient temperature - t a [ ] fig.6 output current vs supply voltage output current [ma] supply voltage - vcc [ v]
ksd-i5o006-003 8 S8200 ? electrical characteristic curves fig.7 dimming waveform ch1 : v fb , 1v/div ch2 : shdn, 5v/div ch3 : i out , 5ma/div ch1 ? ch2 ? ch3 ? fig.8 short circuit current ch1 : shdn, 5v/div ch2 : i out , 50ma/div ch1 ? ch2 ? fig.9 power dissipation vs t a power dissipation - [mw] ambient temperature - t a [ ]
ksd-i5o006-003 9 S8200 sot-25 outline dimension(mm) re com m e nd pcb solde r la nd [ un it : m m ]
ksd-i5o006-003 10 S8200 the auk corp. products are intended for the use as components in general electronic equipment (office and co mmunication equipment, m easuring equipment, home appliance, etc.). please make sure that you co nsult with us before y ou use these auk corp. products in equipments which require high quality and / or reliability, and in equipments which could have major impact to th e welfare of human life(atomi c energy control, airplane, spaceship, transportation, co mbustion control, all types of safety device, etc.). auk corp. cannot accept liability to any damage which may occur in case these auk corp. products were used in the mentioned equipm ents without prior consultation with auk corp.. specifications mentioned in this publicati on are subject to change without notice.
|
