ksd-i7f016-001 1 S8300 linear led driver ic ? description the S8300 is an integrated adjustable constant-current source, driving loads up to 600ma. the output current level can be adjusted via an external resistor(r fb ). the integrated shdn input of the S8300p 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 S8300 in sleep mode, the shdn pin also can be used as an enable input. this discrete integration technology eliminates indi vidual components by combining them into a single package, which results in a significant reduction of both system cost and board space. ? features ? supplies stable bias current for leds ? led drive current adjustable via single external resistor (max 600ma) ? low cost, low external parts count ? halogen-free package is available package type device name marking sop-8 S8300 S8300 pin no symbol description 1 vcc power supply 2 shdn disable on/off 3 gnd ground 4 n.c no connection 5 n.c no connection 6 n.c no connection 7 output open collector output 8 fb feedback / 0.2v reference ? pin assignment & description ? ordering information package : sop-8 8 1
ksd-i7f016-001 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) 600 ma thermal resistance junction-ambient rth(j-a)* 156.3 /w power dissipation p d * 0.8 w operating temperature range t opr -40 ~ +85 storage temperature range t stg -55 ~ +125 * : mounted on a glass epoxy circuit board of50x50mm pad dimension of 50mm 2 ? recommended operating conditions rating characteristic symbol min max unit power supply voltage v cc 3 24 v output voltage v out 1.5 vcc v output sink current i out - 500 ma shut down voltage shdn -0.3 vcc v ? electrical characteristics (ta=25 , unless otherwise noted.) characteristic symbol condition min. typ. max. unit iq maximum i q v cc =3~24v, iout=20ma, vout=open - 8 12 ma leak current ileak vcc=5v, vout=24v - 0.1 1 a feedback voltage v fb v cc =5v, iout=10ma - 200 208 mv dropout voltage vdrop v cc =5v, iout=500ma - 0.5 1.5 v line regulation v fb1 v cc =3v~24v, iout=10ma - 2 10 mv load regulation v fb2 v cc =5v, iout=10ma~iomax - 3 25 mv shdn voltage on vdis on v cc =5v, iout=10ma, vout=vcc 1.5 - - v shdn voltage off vdis off v cc =5v, iout=10ma - - 0.5 v shdn pin current idis vcc=5v, shdn=5v 230 430 630 a short circuit current i sc r fb =0 ? - 1300 - ma thermal shutdown t tsd - - 160 - S8300
ksd-i7f016-001 3 S8300 ? functional block diagram ? design consideration 1) calculation for r fb - r fb = 0.2v / i led 2) calculation for vdrop - vdrop = v cc ? v led 3) calculation for power dissipation on the S8300p -p d1 = (vdrop ? 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. 5) when v cc uses to exceed 25v, dimming f unctions the use is impossible. + - ocp tsd gnd fb out vcc shdn 0.2v
ksd-i7f016-001 4 S8300 ? typical applications
ksd-i7f016-001 5 S8300 S8300p (1) > for operation in excess of S8300 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 such that the voltage seen at pin(v cc & v out )is less than 25v. that is to say, use additional leds to drop the voltage fed to the s 8300 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 enough leds such that voltage at pin(v cc & v out ) of S8300 is < 25v caution : when v s uses to exceed 25v, dimming func tions the use is impossible. S8300p (2) > ? typical applications S8300p >
ksd-i7f016-001 6 S8300 0 50 100 150 200 250 300 350 400 450 500 550 600 0 5 10 15 20 25 30 rfb=0.4? ta=25 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 -60 -40 -20 0 20 40 60 80 100 vcc=3v vcc=5v vcc=24v io =20ma vo=open 450 470 490 510 530 550 570 590 610 630 650 -60 -40 -20 0 20 40 60 80 100 vcc=5v io =500ma 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 -60 -40 -20 0 20 40 60 80 100 vcc=5v io ut=490ma 0.5 0.7 0.8 1.0 1.1 1.3 1.4 1.6 1.7 1.9 2.0 -60 -40 -20 0 20 40 60 80 100 v cc=21v io =10ma -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 -60 -40 -20 0 20 40 60 80 100 vcc = 5v io = 10ma ? 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 q [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-i7f016-001 7 S8300 0 10 20 30 40 50 60 70 80 90 100 0 102030405060708090100 fre.1khz fre.10khz ? electrical characteristic curves fig.7 dimming curve ch1 : shdn, 5v/div ch2 :v out , 5v/div ch3 : i out , 500ma/div fig.8 short circuit current ch1 ? ch2 ? led current ratio [%] shdn : duty ratio(%) ch3 ? fig.9 power dissipation vs t a power dissipation - p d [mw] ambient temperature - t a [ ]
ksd-i7f016-001 8 S8300 sop-8 outline dimension (mm) recommend pcb solder land [unit: mm]
ksd-i7f016-001 9 S8300 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 consult with us before you 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 equi pments without prior consultation with auk corp.. specifications mentioned in this publicati on are subject to change without notice.
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