supertex inc. supertex inc. www.supertex.com cl320 doc.# dsfp-cl320 b032114 general descriptionthe cl320 is designed to drive 3 strings of leds at a constant current of 20ma. other drivers with currents in the range of 20 - 30ma are available. the drive current is ixed, with a 6% tolerance over a v out range of 4.0 - 15v. separate enable pins for each channel allow for pwm dimming, 3-step linear dimming, or individual disconnection of faulty led strings. over-temperature protection circuitry shuts down all 3 channels when the nominal die temperature reaches 135c. normal operation resumes when the die temperature drops by 30c. the cl320 is available in the 8-lead soic (w/heat slug) package and requires a single ceramic bypass capacitor which may be shared among several drivers. block diagram and typical application circuit 3-channel, 20ma linear led driver features ? 6.0% current accuracy @ 4.0 -15v ? 90v standoff voltage ? separate enable pins for each channel allow for pwm dimming ? over-temperature protection ? 8-lead soic (w/heat slug) package applications ? lcd backlighting ? indicator lamps v dd 6.5 - 90v cl320 reg 1 2 3 8 7 6 5 4 c in 100nf en1 en2en3 out1 out2 out3 gnd vin host controller downloaded from: http:///
2 cl320 supertex inc. www.supertex.com doc.# dsfp-cl320 b032114 absolute maximum ratings parameter value supply voltage, v in -0.5v to +100v output voltage, v out -0.5v to +100v enable voltage, v en -0.5v to +6.5v operating temperature range 1 -40c to +119c storage temperature range -65c to +150c thermal characteristics absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditions is not implied. continuous operation of the device at the absolute rating level may affect device reliability. all voltages are referenced to device ground. note: 1. maximum junction temperature internally limited. pin coniguration sym parameter min typ max units conditions t lim over-temperature limit 120 135 150 o c --- t hys over-temperature hysteresis - 30 - o c --- 8-lead soic (w/heat slug) product marking yy = year sealed ww = week sealed l = lot number = ?green? packaging yyww cl320 llll 8-lead soic (w/heat slug) sym parameter min typ max units conditions v in supply voltage 6.5 - 90 v --- v out output voltage 4.0 - 15 v en = 0 90 v en = 1 f en enable toggling frequency 0 - 100 khz --- t j junction temperature -40 - 119 o c --- c in v in capacitor - 100 - nf --- recommended operating conditions (all voltages with respect to gnd pin) package may or may not include the following marks: si or en1 gnd en2 en3 vin out3 out1 out2 underside plate is ground part number package options packing CL320SG-G 8-lead soic (w/heat slug) 2500/reel ordering information typical thermal resistance package ja 8-lead soic (w/heat slug) 84c/w* * mounted on jedec test pcb (2s 2p) -g denotes a lead (pb)-free / rohs compliant package downloaded from: http:///
3 cl320 supertex inc. www.supertex.com doc.# dsfp-cl320 b032114 electrical characteristics (over recommended operating conditions. t a @ 25 o c unless otherwise speciied.) sym parameter min typ max units conditions i in v in supply current - 220 250 a en 1-3 = 1 - 2.2 2.3 ma en 1-3 = 0 i out(off) output current, off - 4.0 10 a en x = 1 i out(on) output current, on - - 21.2 ma en x = 0, v out = 0 - 4.0v 18.8 20.0 21.2 en x = 0, v out = 4.0 - 15v 18.0 20.0 22.0 en x = 0, v out = 15 - 90v v en(on) enable voltage, on - - 0.8 v --- v en(off) enable voltage, off 2.4 - - v --- c en enable input capacitance - 5.0 10 pf --- i enl enable low input current - - 1.0 a v en = 0v i enh enable high input current - - 1.0 a v en = 5.0v t on enable on delay - 2.0 2.4 s --- t rise output current rise time - 1.0 1.2 s --- t off enable off delay - 440 800 ns --- t fall output current fall time - 170 250 ns --- timing temperature effects t rise t fall 90% i out(on) en iout v en(on) t on t off 10% i out(on) 90% 10% v en(off) 1.00 1.050.95 -50 05 01 00 150 junction temperature ( o c) 0.900.85 0.80 current (normalized to 25 o c) 120 25 -40 downloaded from: http:///
4 cl320 supertex inc. www.supertex.com doc.# dsfp-cl320 b032114 load regulation 0 5 10 15 20 40 60 80 100 scale change i out (normalized to nominal) 1.201.00 0.80 0.60 0.40 0.20 0 v out (v) recommended pcb layout underside plate solderedto copper area. exposed copper area may be plated. 1cm 2 exposed copper 1cm 2 exposed copper higher led current v dd v ll cl320 1 2 3 8 7 6 5 4 c in 100nf en1en2 en3 out1 out2 out3 gnd vin host controller reg by paralleling outputs, higher led currents can be achieved. in addition, linear dimming in 3 discr ete steps may be obtained by enabling 1, 2, or 3 outputs. downloaded from: http:///
5 cl320 supertex inc. www.supertex.com doc.# dsfp-cl320 b032114 lowering cl320 power dissipation: separate v in supply v dd cl320 1 2 3 8 76 5 4 c in 100nf v in v ll reg en1en2 en3 out1 out2 out3 gnd vin host controller cl320 power dissipation may be lowered by supplying the cl320 from a voltage source (v in ) that is lower in voltage than the led supply (v ll ). lowering cl320 power dissipation: dropping resistor vdd cl320 1 2 3 8 7 6 5 4 v ll r drop r drop < v ll(min) - 6.5v 2.3ma where: r drop = dropping resistance v ll(min) = minimum supply voltage c in 100nf en1en2 en3 out1 out2 out3 gnd vin host controller reg downloaded from: http:///
6 cl320 supertex inc. www.supertex.com doc.# dsfp-cl320 b032114 lowering cl320 power dissipation: zener diode v dd cl320 1 2 3 8 7 6 5 4 v ll z drop v z < (v ll(min) - 6.5v) where: v z = zener voltage v ll(min) = minimum supply voltage c in 100nf en1en2 en3 out1 out2 out3 gnd vin host controller reg pin description pin # name description 1 en1 output enable, active low. 2 en2 3 en3 4 gnd circuit common. 5 out3 constant current output (sinking). connect the cathodes of the leds to these pins. 6 out2 7 out1 8 vin supply voltage. 6.5v to 90v. bypass locally with a 100nf capacitor to ground. underside plate gnd the exposed underside plate is internally connected to the gnd pin. the plate may either be left loating or connected to ground. solder the plate to an exposed copper area on the pcb for heatsinking purposes (see recommended layout). downloaded from: http:///
supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate ?product liability indemnification insurance agreement.? supertex inc . does not assume responsibility for use of devices described, and limits its liabilit y to the replacement of the devices determined defective due to workmanship. no responsibility is assumed for possible omissions and inaccuracies. circuitry and specifications are subject to change without notice. for the latest product specifications refer to the supertex inc . (website: http//www .supertex.com) ?2014 supertex inc. all rights reserved. unauthorized use or reproduction is prohibited. supertex inc. 1235 bordeaux drive, sunnyvale, ca 94089 t el: 408-222-8888 www.supertex.co m 7 cl320 (the package drawing(s) in this data sheet may not relect the most current speciications. for the latest package outline information go to http://www.supertex.com/packaging.html .) doc.# dsfp-cl320 b032114 8-lead soic (narrow body w/heat slug) package outline (sg) 4.90x3.90mm body, 1.70mm height (max), 1.27mm pitch symbol a a1 a2 b d d1 e e1 e2 e h l l1 l2 1 dimension (mm) min 1.25* 0.00 1.25 0.31 4.80* 3.30 ? 5.80* 3.80* 2.29 ? 1.27 bsc 0.25 0.40 1.04 ref 0.25 bsc 0 o 5 o nom - - - - 4.90 - 6.00 3.90 - - - - - max 1.70 0.15 1.55* 0.51 5.00* 3.81 ? 6.20* 4.00* 2.79 ? 0.50 1.27 8 o 15 o jedec registration ms-012, variation ba, issue e, sept. 2005. * this dimension is not speciied in the jedec drawing. ? this dimension differs from the jedec drawing. drawings not to scale. supertex doc. #: dspd-8sosg, version d041009. 1 8 e e1 d e b a a2 a1 seating plane a a top vi ew side view vi ew b note 1 (index area d/2 x e1/2) vi ew a-a 8 1 bottom view d1 e2 exposed thermal pad zone seating plane gauge plane l l1 l2 view b 1 h h note 1 note: 1. if optional chamfer feature is not present, a pin 1 identiier must be located in the index area indi cated. the pin 1 identiier can be: a molded mark/ identiier; an embedded metal marker; or a printed indicator. downloaded from: http:///
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