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al5802 document number: ds35516 rev. 9 - 2 1 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 30v, adjustable current sink linear led driver description the al5802 combines a high gain np n transistor with a pre-biased npn transistor to make a simple small footprint led driver. the led current is set by an external resistor connected from rext pin (6) to gnd pin (4), the inte rnal high gain tr ansistor develops approximately 0.6v across the external resistor. the al5802 open-collector output can operate from 0.8v to 30v enabling it to operate from 5v to 24v power supplies without additional components. pwm dimming of the led current c an be achieved by either driving the bias pin (2) with a low impedance voltage source, or driving the en pin (3) with an external open-collector npn transistor or open- drain n-channel mosfet. the al5802 is available in a sot 26 package and is ideal for driving 20ma to 120ma led currents. features ? reference voltage vrset = 0.65v ? -40 to +125c temperature range ? 0.8v to 30v open-collector output ? negative temperature co-efficient ? automatically reduces the led current at high temperatures ? low thermal impedance sot26 with copper leadframe ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) ? qualified to aec-q101 standards for high reliability pin assignments (top view) sot26 applications ? linear led driver ? led signs ? offline led luminaries typical application circuit notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com/quality/lead_free.html for more in formation about diodes incorporated?s definitions of halogen- a nd antimony-free, "green" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total br + cl) and <1000ppm antimony compounds. 654 123 q2 q1
al5802 document number: ds35516 rev. 9 - 2 2 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 pin descriptions pin number name function 1 out open-collector led driver output 2 bias biases the open collector output transistor 3 en enable pin for pwm dimming. provides acce ss to the base of q2 and collector of q1 4 gnd ground reference point for setting led current 5 fb feedback pin. should be connected to pin 6. 6 rext current sense pin. led current sensing resistor should be connected from here to gnd. functional block diagram fig. 1 block diagram absolute maximum ratings symbol characteristics values unit v out output voltage relative to gnd 30 v v bias bias voltage relative to gnd (note 4) 30 v v fb led voltage relative to gnd 6 v v en en voltage relative to gnd 6 v v re x t rext voltage relative to gnd 6 v i out output current 150 ma t j operating junction temperature -40 to +150 c t st storage temperature -55 to +150 c these are stress ratings only. operation outside the absolute maximum ratings may cause device failure. operation at the absolute maximum rating for extended periods may reduce device reliability. note: 4. with pins 5 and 6 connected together.
al5802 document number: ds35516 rev. 9 - 2 3 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 package thermal data characteristic symbol value unit power dissipation (note 5) @ t a = +25c power dissipation (note 6) @ t a = +25c power dissipation (note 7) @ t a = +25c p d 0.37 0.87 1 w thermal resistance, junction to ambient air (note 5) @ t a = +25c thermal resistance, junction to ambient air (note 6) @ t a = +25c thermal resistance, junction to ambient air (note 7) @ t a = +25c r ja 335 143 120 c/w notes: 5. device mounted on fr-4 pcb, 2oz with minimum recommended pad layout. 6. device mounted on 25mm x 25mm 2oz copper board. 7. device mounted on 50mm x 50mm 2oz copper board. recommended operating conditions symbol parameter min max unit v bias supply voltage range 4.5 30 v v out out voltage range 0.8 30 i led led pin current (note 8) 10 120 ma t a operating ambient temperature range -40 +125 c note: 8. subject to ambient temperature, power dissipation and pcb. electrical characteristics ? npn transistor ? q1 (@t a = +25c, unless otherwise specified.) symbol characteristic test condition min typ max unit v ( br ) ceo collector-emitter breakdown voltage (note 9) i c = 1.0ma, i b = 0 40 ? ? v v ( br ) ebo emitter-base breakdown voltage i e = 10a, i c = 0 6.0 ? ? v i cex collector cutoff current v ce = 30v, v eb ( off ) = 3.0v ? ? 50 na i bl base cutoff current v ce = 30v, v eb ( off ) = 3.0v ? ? 50 na h fe dc current gain i c = 100a, v ce = 1.0v i c = 1.0ma, v ce = 1.0v i c = 10ma, v ce = 1.0v 40 70 100 ? ? ? ? ? 300 ? v ce ( sat ) collector-emitter saturation voltage (note 9) i c = 10ma, i b = 1.0ma ? ? 0.20 v v be ( sat ) base-emitter saturation voltage i c = 10ma, i b = 1.0ma 0.65 ? 0.85 v electrical characteris tics ? npn pre-biased transistor ? q2 (@t a = +25c, unless otherwise specified.) symbol characteristic test condition min typ max unit v ( br ) cbo collector-base breakdown voltage i c = 50 a, i e = 0 30 ? ? v v ( br ) ceo collector-emitter breakdown voltage (note 9) i c = 1ma, i b = 0 30 ? ? v v ( br ) ebo emitter-base breakdown voltage i e = 50 a, i c = 0 5.0 ? ? v i cbo collector cut-off current v cb = 30v, i e = 0 ? ? 0.5 a i ebo emitter cut-off current v eb = 4v, i c = 0 ? ? 0.5 a v ce ( sat ) collector-emitter saturation voltage (note 9) i c = 10ma, i b = 1ma ? ? 0.3 v h fe dc current gain (note 9) v ce = 5v, i c = 150ma 100 ? ? ? r 1 input resistance ? 7 10 13 k ? *characteristics of transistor only. note: 9. short duration pulse test used to minimize self-heating effect.
al5802 document number: ds35516 rev. 9 - 2 4 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 thermal characteristics fig. 2 derating curve ambient temperaure (c) fig. 3 max power vs. area fig. 4 thermal resistance vs. area
al5802 document number: ds35516 rev. 9 - 2 5 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 typical performance characteristics note: 10. v out in the ?output current vs v out ? graphs limited by power dissipation in the device. fig. 5 output current vs. v out fig. 6 output current vs. r ext fig. 7 output current vs. v out fig. 8 output current vs. v out fig. 9 output current vs. v out fig. 10 output current vs. v bias
al5802 document number: ds35516 rev. 9 - 2 6 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 fig. 13 output current vs. v bias fig. 12 output current vs. v bias fig. 11 output current vs. v bias
al5802 document number: ds35516 rev. 9 - 2 7 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 application information fig. 14 typical application circuit for linear mode current sink led driver fig. 15 application circuit for increasing led current the al5802 has been designed for driving low current leds with typical led current of 20ma to 100ma. it provides a cost effective way for driving low current leds compared with more complex switching regulator solutions. furthermore, it reduces the pcb board area of the solution as there is no need for external components like inductors, capacitors and switching diodes. figure 14 shows a typical application circuit diagram for driving an led or string of leds. the npn transistor q1 measures the led current by sensing the voltage across an external resistor r ext . q1 uses its v be as reference to set the voltage across r ext and controls the base current into q2. q2 operates in linear mode to regulate the led current. the led current is i led = v be(q1) / r ext from this, for any required led current the necessary external resistor r ext can be calculated from r ext = v be(q1) / i led two or more al5802 can be connected in parallel to construct higher current led strings as shown in figure 15. consideration of the expected linear mode power dissipation must be factored into the design, with respect to the al5802's thermal resistance. the maximum voltage across the device can be calculated by taking the maximum supply voltage less the voltage across the led string. v ce(q2) = v cc ? v led ? v be(q1) p d = v ce(q2) * i led + ( v cc ? v be(q2) ? v be(q1) ) 2 / r 1 as the output current of al5802 increases, it is necessary to provide appropriate thermal relief to the device. the power dissipation supported by the device is dependent upon the pcb board material, the copper area and the ambient temperature. the maximum dissipation the device can handle is given by: p d = ( t j(max) - t a ) / r ja refer to the thermal characteristic graphs on page 4 for selecting the appropriate pcb copper area.
al5802 document number: ds35516 rev. 9 - 2 8 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 pwm dimming can be achieved by driv ing the en pin. an external open-collector npn transistor or open-drain n-channel mosfet ca n be used to drive the en pin as shown in figure 16. dimming is achieved by turning the leds on and off for a portion of a single cycle. the pwm signal can be provided by a micro-controller or analog circuitry. figure 17 is a typi cal response of led current vs. pwm duty cycle on the en pin. -or- fig. 16 application circui ts for led driver with pwm dimming functionality fig. 17 typical led current response vs. pwm duty cycle for r ext = 13 ? at 400hz pwm frequency 0 10 20 40 60 80 100 led current (ma) pwm duty cycle (%) 20 0 30 40 50 60
al5802 document number: ds35516 rev. 9 - 2 9 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 to remove the potential of incorrect connection of the power supply damaging the lamp?s leds, many systems use some form of reverse polarity protection. one solution for reverse input polarit y protection is to simply use a diode with a low v f in-line with the driver/led combination. the low v f increases the available voltage to the led stack and dissipates less power. a circuit example is presented in fig. 18 using diodes inc. sbr? (super barrier rectifier) technology. an sdm10u45lp (0.1a/45v) is shown, providing exceptionally low v f for its package size of 1mm x 0.6mm, equivalent to an 0402 chip style package. other reverse voltage ratings are al so available in diodes? website such as the sbr02u100lp (0.2a/100v) or sbr0220lp (0.2a/20v). automotive applications commonly use this method for reverse battery protection. a second approach, shown in fig. 19, improves upon the method shown in fig. 18. whereas the me thod in fig. 18 protects the light engine, it will not function until the problem has been diagnosed and corrected. the method shown in fig. 19 not only provides reverse polarity protection, it also corrects the reversed polarity, allowing the light engine to function. the bas40brw incorporates four low v f , schottky diodes into a single package and allows more voltage available for the led stack and dissipates less power that standard rectifier bridges. fig. 18 application circ uit for led driver with reverse polarity protection fig. 19 application circui t for led driver with assured operation regardless of polarity r s a l5802 v s bas40brw r s a l5802 sdm10u45lp v s
al5802 document number: ds35516 rev. 9 - 2 10 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 ordering information (note 11) device qualification packaging tape and reel quantity part number suffix al5802 commercial sot26 3,000/tape & reel -7 al5802 commercial sot26 10,000/tape & reel -13 note: 11. for packaging details, go to our website at http://www.diodes.com/products/packages.html. marking information l102 = product type marking code ym = date code marking y = year (ex: b = 2014) m = month (ex: 9 = september) date code key year 2011 2012 2013 2014 2015 2016 2017 2018 2019 code y z a b c d e f g month jan feb mar apr may jun jul aug sep oct nov dec code 1 2 3 4 5 6 7 8 9 o n d package outline dimensions please see ap02002 at http://www.diodes.com /datasheets/ap02002.pdf for latest version. suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. l102 ym sot26 dim min max typ a 0.35 0.50 0.38 b 1.50 1.70 1.60 c 2.70 3.00 2.80 d ?? ?? 0.95 h 2.90 3.10 3.00 j 0.013 0.10 0.05 k 1.00 1.30 1.10 l 0.35 0.55 0.40 m 0.10 0.20 0.15 ?? 0 8 ?? all dimensions in mm dimensions value (in mm) z 3.20 g 1.60 x 0.55 y 0.80 c1 2.40 c2 0.95 a m j l d b c h k x z y c1 c2 c2 g
al5802 document number: ds35516 rev. 9 - 2 11 of 11 www.diodes.com march 2014 ? diodes incorporated advance information new product a l5802 important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or any product described herein; neither does diodes inco rporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose pr oducts are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability what soever in respect of any pr oducts purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or u nauthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, ex penses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. this document is written in english but may be translated into mu ltiple languages for reference. only the english version of t his document is the final and determinative format released by diodes incorporated. life support diodes incorporated products are specifically not authorized for use as critical comp onents in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when pro perly used in accordance with in structions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for a ll legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life suppor t devices or systems. copyright ? 2014, diodes incorporated www.diodes.com

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