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AL5811 document number: ds35255 rev. 1 - 2 1 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 60v, linear 75ma adjustable current led driver description the AL5811 is a linear led driver with an adjustable led current up to 75ma offering excellent temperature stability and output handling capability. the AL5811 simplifies the design of linear and isolated or non-isolated led drivers by setting the led current with standard value resistors. the AL5811 has an open drain output that can swing from 1v up to 60v enabling it drive long le d chains. its low 0.5v r set pin is outside of the led current path and so accuracy is maintained while minimizing the required overhead to regulate the led current. this reduces its power dissipation when compared to traditional linear led drivers. this makes it ideal for driving leds up to 75ma. longer led chains can be driven by tapping v cc from the chain, where the chain voltage may exceed 60v. the AL5811 is available in the exposed pad msop-8ep and u-dfn3030-6 packages. features ? low reference voltage (v rset = 0.5v) ? -40c to +125c temperature range ? 6% typical led current tolerance ? low temperature drift ? 1.0v to 60v open-drain output ? high power supply rejection ? msop-8ep and u-dfn3030-6 ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments led nc nc gnd r set nc nc v cc 1 2 3 4 8 7 6 5 (top view) msop-8ep u-dfn3030-6 (top view) led nc gnd v cc nc r set 3 2 1 4 5 6 exposed pad applications ? isolated offline led converters ? linear led driver ? led signs ? instrumentation illumination 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 for more in formation about diodes incorpor ated?s definitions of halogen and antimony free, "green " and lead-free. 3. halogen and antimony free "green? products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm t otal br + cl) and <1000ppm antimony compounds. typical applications circuit AL5811 v cc led gnd r set r set 10k ? v in c in 0.1f v in c in 0.1f AL5811 v cc led gnd r set r set 10k ?
AL5811 document number: ds35255 rev. 1 - 2 2 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 pin descriptions pin name pin number function msop-8ep u-dfn3030-6 v cc 1 1 supply input. connect a 0.1 f ceramic capacitor between v cc and gnd as close as possible to the device. rset 4 3 led current setting pin. connect a resistor from this pin to gnd: i led = 750/r set may also be used to prov ide pwm dimming functionality gnd 5 4 ground reference point of device. led 8 6 led current sink connection. nc 2, 3, 6, 7 2, 5 unused ep exposed pad exposed pad exposed pad (bottom). used to improve thermal impedance of package. it must be connected to gnd directly underneath the package. functional block diagram absolute maximum ratings (@t a = +25c, unless otherwise specified.) symbol parameters ratings unit v cc supply voltage relative to gnd pin (note 4) -0.3 to +66 v v led led voltage relative to gnd pin (note 4) -0.3 to +66 v v rset r set voltage relative to gnd -0.3 to +6 v i led led pin current sink current range 85 ma esd hbm human body model esd protection 1 kv esd cdm charged device model esd protection 1.2 kv t j operating junction temperature -40 to +150 c t st storage temperature -55 to +150 c notes: 4. v cc pin can be greater or smaller than v led ; neither should go below gnd. caution: stresses greater than the 'absol ute maximum ratings' specified above, may cause permanent damage to the device. these are stress ratings only; functional operation of the device at th ese or any other conditions exceeding those indicated in this specification is not imp lied. device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. semiconductor devices are esd sensitive and may be damaged by exposure to esd events. suitable esd precautions should be take n when handling and transporting these devices
AL5811 document number: ds35255 rev. 1 - 2 3 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 package thermal data package jc thermal resistance junction-to-case (note 5) ja thermal resistance junction-to-ambient (note 5) p dis t a = +25c, t j = +125c msop-8ep 37 85c/w (note 6) 1.2w u-dfn3030-6 13 71c/w (note 7) 1.40w notes: 5. dominant conduction path via exposed pad. 6. test condition for msop-8ep: device mounted on fr-4 pc b (51mm x 51mm 2oz copper, minimum recommended pad layout on top lay er and thermal vias to bottom layer ground plane. for better thermal performance, larger copper pad for heat-sink is needed. 7. test condition for u-dfn3030-6: de vice mounted on fr-4 pcb (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and thermal vias to bottom layer with maximum area ground plane. for better thermal performance, larger copper pad for hea t-sink is needed recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter min max unit v cc supply voltage range relative to gnd pin 3.5 60 v v led out voltage range relative to gnd pin 1.0 60 i led led pin current (note 8) 10 75 ma t a operating ambient temperature range -40 +125 c note: 8. maximum led current is also limited by ambient temperat ure and power dissipation such that junction temperature should be kept less than or equal 125c. electrical characteristics (@t a = +25c, v cc = 3.5v, v led = 1.0 (note 9), r set = 15k ? , unless otherwise specified.) symbol parameter conditions min typ max unit v rset r set voltage t a = -40c to +125c 0.5 v i led i led current accuracy r set = 37.5k ? t a = +25c 18 20 22 ma r set = 10k ? 70 75 80 r set = 15k ? 47 50 53 t a = -40c to +125c 46 54 reg line led current line regulation v cc = 3.5v to 60v t a = +25c 0.25 % i cc supply current 3.5v v cc 60v t a = +25c 200 300 a t a = -40c to +125c 350 i leak led pin leakage current v cc = 60v; v led = 60v rset = open circuit t a = +125c 1 a t shdn thermal shutdown 155 c t hys thermal shutdown hysteresis 20 c note: 9. all voltages unless otherwise stat ed are measured with respect to gnd pin.
AL5811 document number: ds35255 rev. 1 - 2 4 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 typical performance characteristics 70 input voltage (v) led current vs. input voltage led c u r r en t (ma) 80 50 60 30 40 10 20 0 ambient temperature (c) led current vs. ambient temperature 90 -40 25 125 led c u r r en t (ma) 80 70 20 10 0 60 50 40 30 r = 10k set r = 15k set r = 37.4k set v = 3.5v v = 1.0v cc led 0 10 20 30 40 50 60 0 led pin voltage (v) led current vs. led pin voltage led c u r r en t (ma) v = 3.5v t = +25c in a r = 15k set 1234 78910 80 led c u r r e n t (ma) 70 60 50 40 30 20 10 0 input voltage (v) led current vs. input voltage r = 37.4k set r = 15k set r = 10k set v = 3.5v t = +25c cc a 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
AL5811 document number: ds35255 rev. 1 - 2 5 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 typical performance characteristics (cont.) ambient temperature(c) thermal shutdown msop-8ep 14 125 led c u r r en t (ma) tshdn thys 0 02 04 06 08 10 12 160 130 135 140 145 150 155 r = 75k v = 9v set in 0 0.1 0.2 0.3 0.4 0.5 0.6 2 3 20 45 input voltage (v) r voltage vs. input voltage set v (v) rset v = 1.0v t = +25c led a r = 15k set ambient temperature (c) r voltage vs. ambient temperature set 0.485 0.486 0.487 0.488 0.489 0.490 0.491 0.492 0.493 0.494 -40 25 125 r voltage (v) set r = 15k set v = 3.5v v = 1.0v cc led 300 input voltage (v) supply current vs. input voltage suppl y c u r r ent (a) 250 200 150 100 50 0 r = 10k set r = 15k set r = 37.4k set v = 1.0v t = +25c led a 60 0152530404555 510 20 35 50 ambient temperature (c) supply current vs. ambient temperature 250 25 s u p p l y c u r r en t (a) 125 -40 200 150 100 50 0 r = 10k set r = 15k set r = 37.4k set v = 3.5v v = 1.0v cc led
AL5811 document number: ds35255 rev. 1 - 2 6 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 application information description the AL5811 is a linear led driver and in normal operation has the leds connected to the same potential as its vcc pin and regul ates the led current by sinking current into to its led pin. the le d current is set by the use of an external resistor, r set , connected from the r set pin to gnd. this resistor supplies the bias current of the AL5811 t ogether with current regulator to set the led current. the led current is determined by this equation: set led r 5 . 0 * 1500 i = where 1500 is the current ratio between the led pin current and r set pin current. with r set = 15k ma 50 k 15 5 . 0 * 1500 i led = = the AL5811 with its 60v capability on its supply pin, v cc , and its led drive pin allows it to operate from supply rails up to 60v and/or directly drive led chains up to 60v as shown in figur es 1 and 2. the voltage applied to the v cc pin can be greater or lower than the voltage applied to the led string. figure 2 shows where you might power the AL5811 from a 5v rail and power the led string from a 12v rail. AL5811 v cc led gnd r set r set 10k ? v in c in 0.1f figure 1. low side current led setting figure 2. low side drive ? separate supplies high voltage operation an extension of figure 2 is to derive the power for the AL5811 fr om the led chain itself see figur e 3. led chains greater than 60v can be driven in this manner as long pwm dimming is not utilized. figure 3. low side led string tapping figure 4. high side current led string the AL5811 can also be used on the high side of the leds, see figure 4. this is a simple way of extending the maximum led chain voltage, however, it does increase the minimum system input voltage to: v in(min) = v led_chain + 3.5v. where v led_chain is the led chain voltage. AL5811 v cc led gnd r set r set = 10k ? v in c in 0.1f v led v in c in 0.1f AL5811 v cc led gnd r set r set AL5811 v cc led gnd r set r set v in c in 0.1f
AL5811 document number: ds35255 rev. 1 - 2 7 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 application information (cont.) pwm dimming led current dimming can be ac hieved by driving the r set pin via the current setting resistor (r set ) and series mosfet switch to ground (figure 5). the r set pin current is then effectively switched on and off causing the led current to turn on and off. figure 5. pwm dimming 0 10 20 30 40 50 60 70 80 0 102030405060708090100 duty cycle (%) led current vs. duty cycle frequency = 100hz; duty cycle = 0.1% to 100%; r = 10k; 2leds in series set led current (ma) figure 6. pwm dimming linearity thermal considerations when designing linear led drivers carefu l consideration must be given to: 1. the power dissipation within the led driver and 2. pcb layout/heat sinking. a linear led driver has to be able to handle the large potential input voltage variations due to the supply voltage tolerance a nd also the variation in led forward voltage due to binning and temperature. this can result in a large potential difference across the led dr iver resulting in a larger than anticipated power dissipation. for example in n 12v powered system with a 5% output voltage tole rance; the input voltage could typically vary from 12.6v down to 11.4v driving 3 leds with a voltage varying from 3v to 3.5v at 75ma. this m eans that the led driver has to cope with a voltage drop across va rying from approximately 3.6v to 0.9v. this means that the powe r dissipation of the AL5811 could be as much as 270mw. figure 7 below shows how the AL5811?s power dissipation capability vari es with package; these values will vary with pcb size an d area of metal associated with the ground plane used for heat sinking. by increas ing the area on the top layer the thermal impedance of both p ackages could be improved.
AL5811 document number: ds35255 rev. 1 - 2 8 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 u-dfn3030-6 msop-8ep -40 125 -25 110 -10 95 580 20 50 35 65 ambient temperature (c) 1.6 1.4 0.2 0.0 1.2 1.0 0.8 0.6 0.4 p o we r dissi p a t i o n (w) figure 7. power dissipation derating ordering information part number package code packaging 7?/13? tape and reel quantity part number suffix AL5811mp-13 mp msop-8ep 2500/tape & reel -13 AL5811ff-7 ff u-dfn3030-6 3000/tape & reel -7
AL5811 document number: ds35255 rev. 1 - 2 9 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 marking information (1) msop-8ep AL5811 ( top view ) y w x e part number logo 87 65 1 234 y : year : 0~9 g : green a~z : 27~52 week; z represents w : week : a~z : 1~26 week; 52 and 53 week msop8-ep (2) u-dfn3030-6 xx : identification code ( top view ) x : g : green x y x x w y : year : 0~9 w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week part number package identification code AL5811ff-7 u-dfn3030-6 a9
AL5811 document number: ds35255 rev. 1 - 2 10 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com /datasheets/ap02002.pdf for latest version. (1) package type: msop-8ep (2) package type: u-dfn3030-6 msop-8ep dim min max typ a - 1.10 - a1 0.05 0.15 0.10 a2 0.75 0.95 0.86 a3 0.29 0.49 0.39 b 0.22 0.38 0.30 c 0.08 0.23 0.15 d 2.90 3.10 3.00 d1 1.60 2.00 1.80 e 4.70 5.10 4.90 e1 2.90 3.10 3.00 e2 1.30 1.70 1.50 e3 2.85 3.05 2.95 e - - 0.65 l 0.40 0.80 0.60 a 0 8 4 x - - 0.750 y - - 0.750 all dimensions in mm u-dfn3030-6 dim min max typ a 0.57 0.63 0.60 a1 0 0.05 0.02 a3 - - 0.15 b 0.35 0.45 0.40 d 2.95 3.05 3.00 d2 2.25 2.45 2.35 e 2.95 3.05 3.00 e2 1.48 1.68 1.58 e - - 0.95 l 0.35 0.45 0.40 z - - 0.35 all dimensions in mm 1 d a a1 a2 e e y x seating plane gauge plane l d 8xb see detail c detail c c a e1 e3 a3 e2 4 x 1 0 4 x 1 0 0.25 d1 d d 2 e e b l e 2 a a 3 p i n # 1 i d s e a t i n g p l a n e z 4 x a 1 4 5 0 . 3 5 * 0 . 3 5
AL5811 document number: ds35255 rev. 1 - 2 11 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 suggested pad layout please see ap02001 at http://www.diodes.com/dat asheets/ap02001.pdf for the latest version. (1) msop-8ep (2) u-dfn3030-6 dimensions value (in mm) c 0.650 g 0.450 x 0.450 x1 2.000 y 1.350 y1 1.700 y2 5.300 dimensions value (in mm) c 0.950 x 0.500 x1 2.400 x2 2.550 y 0.600 y1 1.780 y2 3.300 g x c y y2 y1 x1 x 2 y 1 y c y 2 x 1 x c - 0 . 4 0 9
AL5811 document number: ds35255 rev. 1 - 2 12 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 taping orientation (note 10) for u-dfn3030-6 note: 10. the taping orientation of the other package type c an be found on our website at http://www.diodes .com/datasheets/a p02007.pdf.
AL5811 document number: ds35255 rev. 1 - 2 13 of 13 www.diodes.com january 2013 ? diodes incorporated new product a l5811 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 descri bed herein. diodes incorporated does not assume any liability ari sing out of the application or use of this document or an y product described herein; neither does di odes incorporated 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 products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability w hatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, 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 multiple 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 component s 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 proper ly used in accordance with instructions 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 all 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 arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2013, diodes incorporated www.diodes.com

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