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power management & multimarket datasheet revision 2.1, 2015-01-28 bcr 420u e6327 / bcr 421u e6327 led driver
edition 2015-01-28 published by infineon technologies ag 81726 munich, germany ? 2015 infineon technologies ag all rights reserved. legal disclaimer the information given in this docu ment shall in no event be regarded as a guarantee of conditions or characteristics. with respect to any examples or hints given herein, any typical values stated herein and/or any information regarding the application of the device, infine on technologies hereby disclaims any and all warranties and liabilities of any kind, including witho ut limitation, warranties of non-infrin gement of intellectua l property rights of any third party. information for further information on technology, delivery terms and conditions and prices, please contact the nearest infineon technologies office ( www.infineon.com ). warnings due to technical requirements, components may contain dangerous substances. for information on the types in question, please contact the nearest infineon technologies office. infineon technologies compon ents may be used in life-su pport devices or systems only with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system or to affect the safe ty or effectiveness of that de vice or system. life support devices or systems are intended to be implanted in the hu man body or to support an d/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered.
bcr 420u e6327 / bcr 421u e6327 datasheet 3 revision 2.1, 2015-01-28 trademarks of infineon technologies ag aurix?, c166?, canpak?, ci pos?, cipurse?, econopac k?, coolmos?, coolset?, corecontrol?, crossav e?, dave?, di-pol?, easypim?, econobridge?, econodual?, econopim?, econopack?, eicedriver?, eupec?, fcos?, hitfet?, hybridpack?, i2rf?, isoface?, isopack?, mipaq?, modstack?, my-d?, novalithic?, optimos?, origa?, powercode?; primarion?, pr imepack?, primestack?, pr o-sil?, profet?, rasic?, reversave?, satric?, si eget?, sindrion?, sipmos?, smartl ewis?, solid flash?, tempfet?, thinq!?, trenchstop?, tricore?. other trademarks advance design system? (ads) of agilent te chnologies, amba?, arm?, multi-ice?, keil?, primecell?, realview?, thumb?, vision? of arm limited, uk. autosar? is licensed by autosar development partnership. bluetooth? of bluetooth sig inc. cat-iq? of dect forum. colossus?, firstgps? of trimble navigation ltd. emv? of emvc o, llc (visa holdings in c.). epcos? of epcos ag. flexgo? of microsoft corp oration. flexray? is licensed by flexray consortium. hyperterminal? of hilgraeve incorporated. iec? of commission electrot echnique internationale. irda? of infrared data association corporation. iso? of international organization for standardization. matlab? of mathworks, inc. maxim? of maxim integrated products, inc. microtec?, nucleus? of mentor graphics corporation. mipi? of mipi allianc e, inc. mips? of mips technologies, inc., u sa. murata? of murata manufacturing co., microwave office? (mwo) of applied wave research inc., omnivision? of omnivision technologies, inc. openwave? openwave systems inc. red hat? red hat, inc. rfmd? rf micro devices, inc. sirius? of si rius satellite radio inc. solaris? of sun microsystems, inc. spansion? of spansion llc ltd. symbian? of symbian software limited. taiyo yuden? of taiyo yuden co. teaklite? of ceva, inc. tektro nix? of tektronix inc. toko? of toko kabushiki kaisha ta. unix? of x/open company limited. verilo g?, palladium? of cadence design systems, inc. vlynq? of texas instruments incorpor ated. vxworks?, wind river? of wind ri ver systems, inc. zetex? of diodes zetex limited. last trademarks update 2011-11-11 revision history page or item subjects (major changes since previous revision) revision 2.1, 2015-01-28 all using full sales names bcr 420u e6327 / bc r 421u e6327 instead of short form bcr420u / bcr421u page 7 halogen free logo removed
bcr 420u e6327 / bcr 421u e6327 table of contents datasheet 4 revision 2.1, 2015-01-28 table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 list of figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 list of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1led driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.3 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 5 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 table of contents
bcr 420u e6327 / bcr 421u e6327 list of figures datasheet 5 revision 2.1, 2015-01-28 figure 1-1 pin configuration and typical application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 3-1 total power dissipation p tot = f(t s ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 3-2 permissible pulse load r thjs = f(t p ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 3-3 permissible pulse load p totmax / p totdc = f(t p ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 3-4 bcr 420u: output current versus v out i out = f(v out ), v en = 40 v, r ext = parameter . . . . . . . . . . . . 13 figure 3-5 bcr 420u: output current versus r ext i out = f(r ext ), v en = 40 v, v out = parameter . . . . . . . . . . . . 13 figure 3-6 bcr 420u: output current versus v out i out = f(v out ), v en = 40 v, r ext = open, t a = parameter . . . 14 figure 3-7 bcr 420u: output current versus v out i out = f(v out ), v en = 40 v, r ext = 20 ? , t a = parameter. . . . 14 figure 3-8 bcr 420u: output current versus v out i out = f(v out ), v en = 40 v, r ext = 6 ? , t a = parameter. . . . . 15 figure 3-9 bcr 420u: output current versus v en i out = f(v en ), v out = 2 v, r ext = open, t a = parameter . . . . 15 figure 3-10 bcr 420u: output current versus v en i out = f(v en ), v out = 2 v, r ext = 20 ? , t a = parameter. . . . . 16 figure 3-11 bcr 420u: output current versus v en i out = f(v en ), v out = 2 v, r ext = 6 ? , t a = parameter. . . . . . 16 figure 3-12 bcr 420u: output current versus v en i out = f(v en ), v out = 2 v, r ext = parameter . . . . . . . . . . . . . 17 figure 3-13 bcr 420u: enable current versus v en i en = f(v en ), r ext = open, i out = 0 a, t a = parameter . . . . . 17 figure 3-14 bcr 421u: output current versus v out i out = f(v out ), v en = 3.3 v, r ext = parameter . . . . . . . . . . . . 18 figure 3-15 bcr 421u: output current versus r ext i out = f(r ext ), v en = 3.3 v, v out = parameter . . . . . . . . . . . . 18 figure 3-16 bcr 421u: output current versus v out i out = f(v out ), v en = 3.3 v, r ext = open, t a = parameter . . . 19 figure 3-17 bcr 421u: output current versus v out i out = f(v out ), v en = 3.3 v, r ext = 20 ? , t a = parameter . . . 19 figure 3-18 bcr 421u: output current versus v out i out = f(v out ), v en = 3.3 v, r ext = 6 ? , t a = parameter . . . . 20 figure 3-19 bcr 421u: output current versus v en i out = f(v en ), v out = 2 v, r ext = open, t a = parameter . . . . 20 figure 3-20 bcr 421u: output current versus v en i out = f(v en ), v out = 2 v, r ext = 20 ? , t a = parameter. . . . . 21 figure 3-21 bcr 421u: output current versus v en i out = f(v en ), v out = 2 v, r ext = 6 ? , t a = parameter. . . . . . 21 figure 3-22 bcr 421u: output current versus v en i out = f(v en ), v out = 2 v, r ext = parameter . . . . . . . . . . . . . 22 figure 3-23 bcr 421u: enable current versus v en i en = f(v en ), r ext = open, i out = 0 a, t a = parameter . . . . . 22 figure 4-1 application circuit: enabling / pwm by micro controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 4-2 application circuit: enabling by connecting to v s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 figure 5-1 package outline for sc74 (dimensi ons in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 5-2 package footprint for sc74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 figure 5-3 tape and reel information for sc74 (dimensions in mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 list of figures
bcr 420u e6327 / bcr 421u e6327 list of tables datasheet 6 revision 2.1, 2015-01-28 table 2-1 maximum ratings at t a = 25 c, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 2-2 thermal resistance at t a = 25 c, unless otherwise specified. . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 table 2-3 electrical characteristics at t a = 25 c, unless otherwise specified . . . . . . . . . . . . . . . . . . . . . . . . 9 table 2-4 dc characteristics with stabilized led load at t a = 25 c, unless otherwise specified . . . . . . . . 10 list of tables
bcr 420u e6327 / bcr 421u e6327 led driver datasheet 7 revision 2.1, 2015-01-28 1 led driver 1.1 features 1.2 applications ? architectural led lighting ? channel letters for advertising, led strips for decorative lighting ? retail lighting in fridge, freezer case and vending machines ? emergency lighting (e.g. steps lig hting, exit way signs etc.) 1.3 general description the bcr 420u e6327 / bcr 421u e6327 provides a low-cost solution for driving 0.25 w leds with a typical led current of 75 ma to 150 ma. internal breakdown volta ge is higher than 40 v which is the maximum voltage the led driver can sustain when the output is directly connected to supply voltage. the bcr 420u e6327 / bcr 421u e6327 can be operated with a supply voltage of more than 40 v considering the voltage drop of the led load which reduces the out put voltage to the maximum rating of the driver. the enable pin of bcr 420u e6327 can withstand a maxi mum voltage of 40 v which can be increased adding a series resistor in front of the enable pin reducing the voltage at the enable pin below 40 v. the digital input pin of bcr 421u e6327 allows dimming via a micro controller with frequencies up to 10 khz. a reduction of the output current at higher temperatures is the result of the negative temperature coefficient of - 0.2 %/k of the led driver. with no need for additional external components like inductors, capacitors and free wheeling diodes, the bcr 420u e6327 / bcr 421u e6327 led drivers are a cost-effic ient and pcb-area saving solution for driving 0.25 w leds. ? led drive current preset to 10 ma ? continuous output current up to 150 ma with an external resistor ? easy paralleling of drivers to increase current ? supply voltage up to 40 v ? low side current control ? digital pwm input up to 10 khz frequency (bcr 421u e6327) ? up to 1 w power dissipation in a small sc74 package ? negative thermal coefficient of -0.2 %/k redu ces output current at higher temperatures ? rohs compliant (pb-free) package ? automotive qualified according aec q101 sc74-3d
bcr 420u e6327 / bcr 421u e6327 led driver datasheet 8 revision 2.1, 2015-01-28 figure 1-1 pin configuration and typical application sales name marking pin configuration package bcr 420u e6327 40 1 = en 2; 3; 5 = out 4 = gnd 6 = r ext sc74 bcr 421u e6327 41 1 = en 2; 3; 5 = out 4 = gnd 6 = r ext sc74 pin configuration typical application en out r ext gnd +v s v drop 2,3,5 1 6 4 i out i en bcr 420 u e6327 en out out gnd out r ext 1 2 3 4 5 6 r ext (optional )
bcr 420u e6327 / bcr 421u e6327 electrical characteristics datasheet 9 revision 2.1, 2015-01-28 2 electrical characteristics attention: stresses above the max. values listed here may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may affect device reliability. maximum ratings are absolute ratings; exceeding only one of these values may cause irreversible damage to the integrated circuit. table 2-1 maximum ratings at t a = 25 c, unless otherwise specified parameter symbol values unit note / test condition min. typ. max. enable voltage bcr 420u e6327 bcr 421u e6327 v en - - - - 40 4.5 v output current i out --200ma output voltage v out --40v reverse voltage between all terminals v r --0.5v total power dissipation p tot - - 1000 mw t s 100 c junction temperature t j --150c storage temperature range t stg -65 - 150 c table 2-2 thermal resistance at t a = 25 c, unless otherwise specified parameter symbol values unit note / test condition min. typ. max. junction - soldering point 1) 1) for calculation of r thja please refer to application note an077 (thermal resistance calculation) r thjs --50k/w table 2-3 electrical characteristics at t a = 25 c, unless otherwise specified parameter symbol values unit note / test condition min. typ. max. collector-emitter breakdown voltage v br(ceo) 40 - - v i c =1ma, i b =0 enable current bcr 420u e6327 bcr 421u e6327 i en - - 1.2 1.2 - - ma v en =24v v en =3.3v dc current gain h fe 200 350 500 - i c =50ma, v ce =1v internal resistor r int 85 95 105 ? i rint =10ma bias resistor bcr 420u e6327 bcr 421u e6327 r b - - 20 1.5 - - k ?
bcr 420u e6327 / bcr 421u e6327 electrical characteristics datasheet 10 revision 2.1, 2015-01-28 output current bcr 420u e6327 bcr 421u e6327 output current at r ext =5.1 ? bcr 420u e6327 bcr 421u e6327 i out 9 9 - - 10 10 150 150 11 11 - - ma v out =1.4v v en =24v v en =3.3v v out >2.0v v en =24v v en =3.3v voltage drop ( v rext ) v drop 0.85 0.95 1.05 v i out =10ma table 2-4 dc characteristics with stabilized led load at t a = 25 c, unless otherwise specified parameter symbol values unit note / test condition min. typ. max. lowest sufficient supply voltage overhead v smin -1.4-v i out >18ma output current change versus t a bcr 420u e6327 bcr 421u e6327 ? i out / i out - - -0.2 -0.2 - - %/k v out >2.0v v en =24v v en =3.3v output current change versus v s bcr 420u e6327 bcr 421u e6327 ? i out / i out - - 1 1 - - %/v v out >2.0v v en =24v v en =3.3v table 2-3 electrical characteristics at t a = 25 c, unless otherwise specified (cont?d) parameter symbol values unit note / test condition min. typ. max.
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 11 revision 2.1, 2015-01-28 3 typical characteristics figure 3-1 total power dissipation p tot = f ( t s ) figure 3-2 permissible pulse load r thjs = f ( t p ) 0 200 400 600 800 1000 1200 0 20 40 60 80 100 120 140 p tot [mw] t s [ c] 0.1 1 10 100 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 r thjs [k/w] t p [s] d = 0 d = 0.005 d = 0.01 d = 0.02 d = 0.05 d = 0.1 d = 0.2 d = 0.5
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 12 revision 2.1, 2015-01-28 figure 3-3 permissible pulse load p totmax / p totdc = f ( t p ) 1 10 100 1000 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 p totmax / p totdc t p [s] d = 0 d = 0.005 d = 0.01 d = 0.02 d = 0.05 d = 0.1 d = 0.2 d = 0.5
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 13 revision 2.1, 2015-01-28 figure 3-4 bcr 420u: output current versus v out i out = f ( v out ), v en = 40 v, r ext = parameter figure 3-5 bcr 420u: output current versus r ext i out = f ( r ext ), v en = 40 v, v out = parameter 0 0.05 0.1 0.15 0.2 0 1 2 3 4 5 6 7 8 9 10 11 12 i out [a] v out [v] r ext = open r ext = 30 r ext = 15 r ext = 10 r ext = 8 r ext = 6 0 0.05 0.1 0.15 0.2 1 10 100 i out [a] r ext [ ] v out = 1.4 v v out = 5.4 v
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 14 revision 2.1, 2015-01-28 figure 3-6 bcr 420u: output current versus v out i out = f ( v out ), v en = 40 v, r ext = open, t a = parameter figure 3-7 bcr 420u: output current versus v out i out = f ( v out ), v en = 40 v, r ext = 20 ? , t a = parameter 0 0.005 0.01 0.015 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c 0 0.01 0.02 0.03 0.04 0.05 0.06 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 15 revision 2.1, 2015-01-28 figure 3-8 bcr 420u: output current versus v out i out = f ( v out ), v en = 40 v, r ext = 6 ? , t a = parameter figure 3-9 bcr 420u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = open, t a = parameter 0 0.05 0.1 0.15 0.2 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c 0 0.005 0.01 0.015 0 5 10 15 20 25 30 i out [a] v en [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 16 revision 2.1, 2015-01-28 figure 3-10 bcr 420u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = 20 ? , t a = parameter figure 3-11 bcr 420u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = 6 ? , t a = parameter 0 0.01 0.02 0.03 0.04 0.05 0.06 0 5 10 15 20 25 30 i out [a] v en [v] -40 c 25 c 85 c 0 0.05 0.1 0.15 0.2 0 5 10 15 20 25 30 i out [a] v en [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 17 revision 2.1, 2015-01-28 figure 3-12 bcr 420u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = parameter figure 3-13 bcr 420u: enable current versus v en i en = f ( v en ), r ext = open, i out = 0 a, t a = parameter 0 0.05 0.1 0.15 0 5 10 15 20 25 30 i out [a] v en [v] r ext = open r ext = 60 r ext = 30 r ext = 10 r ext = 8 r ext = 6 0 0.5 1 1.5 2 2.5 3 0 5 10 15 20 25 30 35 40 i en [ma] v en [v] -40 c 25 c 80 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 18 revision 2.1, 2015-01-28 figure 3-14 bcr 421u: output current versus v out i out = f ( v out ), v en = 3.3 v, r ext = parameter figure 3-15 bcr 421u: output current versus r ext i out = f ( r ext ), v en = 3.3 v, v out = parameter 0 0.05 0.1 0.15 0.2 0 1 2 3 4 5 6 7 8 9 10 11 12 i out [a] v out [v] r ext = open r ext = 30 r ext = 15 r ext = 10 r ext = 8 r ext = 6 0 0.05 0.1 0.15 0.2 1 10 100 i out [a] r ext [ ] v out = 1.4 v v out = 5.4 v
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 19 revision 2.1, 2015-01-28 figure 3-16 bcr 421u: output current versus v out i out = f ( v out ), v en = 3.3 v, r ext = open, t a = parameter figure 3-17 bcr 421u: output current versus v out i out = f ( v out ), v en = 3.3 v, r ext = 20 ? , t a = parameter 0 0.005 0.01 0.015 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c 0 0.01 0.02 0.03 0.04 0.05 0.06 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 20 revision 2.1, 2015-01-28 figure 3-18 bcr 421u: output current versus v out i out = f ( v out ), v en = 3.3 v, r ext = 6 ? , t a = parameter figure 3-19 bcr 421u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = open, t a = parameter 0 0.05 0.1 0.15 0.2 0 2 4 6 8 10 12 i out [a] v out [v] -40 c 25 c 85 c 0 0.005 0.01 0.015 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 i out [a] v en [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 21 revision 2.1, 2015-01-28 figure 3-20 bcr 421u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = 20 ? , t a = parameter figure 3-21 bcr 421u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = 6 ? , t a = parameter 0 0.01 0.02 0.03 0.04 0.05 0.06 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 i out [a] v en [v] -40 c 25 c 85 c 0 0.05 0.1 0.15 0.2 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 i out [a] v en [v] -40 c 25 c 85 c
bcr 420u e6327 / bcr 421u e6327 typical characteristics datasheet 22 revision 2.1, 2015-01-28 figure 3-22 bcr 421u: output current versus v en i out = f ( v en ), v out = 2 v, r ext = parameter figure 3-23 bcr 421u: enable current versus v en i en = f ( v en ), r ext = open, i out = 0 a, t a = parameter 0 0.05 0.1 0.15 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 i out [a] v en [v] r ext = open r ext = 60 r ext = 30 r ext = 10 r ext = 8 r ext = 6 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 i en [ma] v en [v] -40 c 25 c 80 c
bcr 420u e6327 / bcr 421u e6327 application hints datasheet 23 revision 2.1, 2015-01-28 4 application hints figure 4-1 application circuit: enabling / pwm by micro controller figure 4-2 application circuit: enabling by connecting to v s application hints bcr 420u e6327 / bcr 421u e6327 serve as an easy to use constant current sources for leds. in stand alone application an external resistor can be connected to adjust the current from 10 ma to 250 ma. r ext can be determined by using figure 3-5 or figure 3-15 . connecting a low tolerance resistor r ext will improve the overall accuracy of the curr ent sense resistance formed by the parallel connection of r int and r ext leading to an improved current accuracy. please take into acc ount that the result ing output currents will be slig htly lower due to the self heating of the component and th e negative thermal coefficient. please visit our web site www.infineon.com/lowcostleddriver for application notes and for up-to-date application information. en out r ext gnd +v s 2,3,5 1 i out i en bcr 421 u e6327 c v drop 6 4 r ext (optional ) en out r ext gnd +v s v drop 2,3 ,5 1 6 4 i out i en bcr 420 u e 6327 r ext (optional )
bcr 420u e6327 / bcr 421u e6327 package datasheet 24 revision 2.1, 2015-01-28 5 package figure 5-1 package outline for sc74 (dimensions in mm) figure 5-2 package footprint for sc74 (dimensions in mm) figure 5-3 tape and reel information for sc74 (dimensions in mm) sc74-po v0 4 54 6 3 2 1 1.1 max. (0.35) (2.25) 0.2 2.9 b 0.2 +0.1 -0.05 0.35 pin 1 marking m b 6x 0.95 1.9 0.15 -0.06 +0.1 1.6 a 0.1 2.5 0.25 0.1 0.1 a 0.2 m 0.1 max. 0.5 0.95 1.9 2.9 sc74-fpr v0 4 sc74-t p 2.7 4 3.15 pin 1 marking 8 0.2 1.15
bcr 420u e6327 / bcr 421u e6327 terminology datasheet 25 revision 2.1, 2015-01-28 terminology ? i out / i out output current change h fe dc current gain i en enable current i out output current i r reverse current led light emitting diode pcb printed circuit board p tot total power dissipation pwm pulse width modulation r b bias resistor r ext external resistor r int internal resistor rohs restriction of hazardous substance directive r thjs thermal resistance junction to soldering point t a ambient temperature t j junction temperature t s soldering point temperature t stg storage temperature v br(ceo) collector-emitter breakdown voltage v br breakdown voltage v drop voltage drop v en enable voltage v out output voltage v r reverse voltage v s supply voltage v smin lowest sufficient supp ly voltage overhead
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