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industrial and multimarket data sheet revision 2.0, 2011-08-17 ild4035 350 ma step do wn led driver led drivers for high power leds
edition 2011-08-17 published by infineon technologies ag 81726 munich, germany ? 2011 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.
ild4035 350 ma step down led driver data sheet 3 revision 2.0, 2011-08-17 trademarks of infineon technologies ag aurix?, bluemoon?, c166?, ca npak?, cipos?, cipurse?, comn eon?, econopack?, coolmos?, coolset?, corecontrol?, crossave?, dave?, easypim?, econobri dge?, econodual?, econopim?, eicedriver?, eupec?, fcos?, hitfe t?, hybridpack?, i2rf?, isoface?, isopack?, mipaq?, modstack?, my-d?, novalithic?, omnitune?, optimos?, origa?, primarion?, primepack?, primestack?, pr o-sil?, profet?, rasic?, re versave?, satric?, sieget?, sindrion?, sipmos?, smarti?, smartlew is?, solid flash?, tempfet?, thinq!?, trenchstop?, tricore?, x-go ld?, x-pmu?, xmm?, xposys?. 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. mifare? of nx p. mipi? of mipi alliance, inc. mips? of mips technologies, inc., usa. murata? of murata manufacturing co., microwave offi ce? (mwo) of applied wave research inc., omnivision? of omnivision technologies, inc. open wave? openwave systems inc. red hat? red hat, inc. rfmd? rf micro devices, inc. sirius? of sirius sate llite radio inc. solaris? of sun microsystems, inc. spansion? of spansion llc ltd. symbian? of sy mbian software limited. taiyo yuden? of taiyo yuden co. teaklite? of ceva, inc. t ektronix? of tektroni x inc. toko? of toko kabushiki kaisha ta. unix? of x/open company limited. verilog?, palladium? of cadence design systems, inc. vlynq? of texas instruments inco rporated. vxworks?, wind river? of wind river systems, inc. zetex? of diodes zetex limited. last trademarks update 2010-10-26 revision history page or item subjects (major changes since previous revision) revision 2.0, 2011-08-17 table 2 maximum peak current specified for hysteretic peak condition table 2 maximum junction temperature increased to 150 c figure 3 safe operating area increased table 4 maximum supply voltage reduced to 40 v table 4 overall current consumption and standby current reduced table 4 over temperature protection improved from flicker to sloped behaviour table 5 application setup changed table 6 voltage range of digital control signals changed chapter 6.3 over temperature protection improved from flicker to sloped behaviour chapter 6.4 figures of switching parameters changed revision 1.0, 2010-11-11
ild4035 350 ma step down led driver table of contents data sheet 4 revision 2.0, 2011-08-17 table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 list of figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 list of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2product brief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.1 dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 5.2 switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5.3 digital signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 6 basic application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.1 setting the average led current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.2 dimming of the leds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.3 temperature protection circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 6.4 switching parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 8 8 evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 table of contents
ild4035 350 ma step down led driver list of figures data sheet 5 revision 2.0, 2011-08-17 figure 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 2 total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 3 safe operating area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 4 pwm dimming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 5 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 6 ild4035 on evaluation board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 figure 7 package outline sc74 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 figure 8 recommended pcb footprint for reflow soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 figure 9 tape loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 list of figures
ild4035 350 ma step down led driver list of tables data sheet 6 revision 2.0, 2011-08-17 table 1 pin definition and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 table 2 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3 maximum thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4 dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 5 switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 6 digital control parameter at pin en/p wm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 list of tables
ild4035 350 ma step down led driver list of tables data sheet 7 revision 2.0, 2011-08-17
sc74-3d product name package pin configuration marking ild4035 sc74-6-4 1 = v s 2 = gnd 3 = en 4 = v switch 5 = gnd 6 = v sense 35 350 ma step down led driv er with internal switch ild4035 data sheet 8 revision 2.0, 2011-08-17 1 features ? wide input voltage range: 4.5 v ... 40 v ? internal switch for up to 400 ma average led current ? up to 95 % efficiency ? over current protection ? over voltage protection ? temperature protection mechanism ? inherent open-circuit led protection ? soft-start capability ? low shut down current ? analog and pwm dimming possible ? typical 3 % output current accuracy ? minimum external components required ? small package: sc74 applications ? led driver for genera l lighting applications ? retail, office and residential luminaires and downlights ? led replacement lamps ? architectural lighting
ild4035 350 ma step down led driver product brief data sheet 9 revision 2.0, 2011-08-17 2 product brief the ild4035 is a hysteretic step down led driver ic for general lighting applications, which is capable to drive high power leds with average currents up to 400 ma. the ic incorporates a wide input voltage range and an internal power switch. the output current level can be adjusted with an external sense resistor. according to the multifuncti onal control pin the ic can be switched on and off by an external signal, which is also suitable to regulate brightness of the leds by pwm or analog voltage dimming. depending on the value of the switch ing inductor the switching frequency and the voltage ripple can be set. the precise internal ban dgap stabilizes the circuit and provides stable current condit ions over temperature range. to ensure a long lifetime of the led system, the ild4035 incorporates an overvoltage and an overcurrent protection. in addition, the integr ated thermal protec tion will reduce the output current to protect the leds and the ic against thermal stress. figure 1 block diagram ild4035_ block diagram.vsd 6 5 4 3 2 1 v s gnd en / pwm v sense gnd v switch ild4035 buck led converter i / v vref vstab vstab vstab vstab vstab over cur r ent pr otection tpc over voltage pr otection
ild4035 350 ma step down led driver product brief data sheet 10 revision 2.0, 2011-08-17 pin definition table 1 pin definition and function pin no. name pin type buffer type function 1 v s input ? supply voltage 2 gnd gnd ? ic ground 3 en / pwm input ? multifunctional pin: ? chip enable signal ? analog dimming signal ? pwm dimming signal 4 v switch output ? power switch output 5 gnd gnd ? ic ground 6 v sense input ? led current sense input
ild4035 350 ma step down led driver maximum ratings data sheet 11 revision 2.0, 2011-08-17 3 maximum ratings 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 maximum ratings parameter symbol values unit note / test condition min. typ. max. supply voltage v s ??45v? peak output current i switch ? ? 550 ma hysteretic peak current total power dissipation, t s 85c p tot ??1000mw? junction temperature t j ??150c? storage temperature range t stg -65 ? 150 c ? esd capability at all pins v esd hbm ??4 kv hbm acc. to jesd22-a114
ild4035 350 ma step down led driver thermal characteristics data sheet 12 revision 2.0, 2011-08-17 4 thermal characteristics figure 2 total power dissipation equation (1) is gives an estimation for the power dissipation of ild4035. (1) table 3 maximum thermal resistance 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 ??65k/w? 0 0.2 0.4 0.6 0.8 1 1.2 0 20 40 60 80 100 120 140 160 p tot [w] t s [ c] ma i w f cycle duty i v p led switch led tot 350 1 1 . 1 ? ? + ? ? =
ild4035 350 ma step down led driver thermal characteristics data sheet 13 revision 2.0, 2011-08-17 figure 3 safe operating area figure 3 shows the safe operating area for the respective in ductance values. the safe operating area consists of the minimum and maximum allowed average led curren t and the resulting voltage overhead. the voltage overhead v overhead is the difference between the supply voltage v s and the sum of the led forward voltages v fled . example calculation 1 3 leds in series, v fled = 3v, i led = 350 ma, v s = 12 v v overhead = v s - v fled = 12 v - 9 v = 3 v any of the above coil values can be used example calculation 2 6 leds in series, v fled = 3v, i led = 250 ma, v s = 24 v v overhead = v s - v fled = 24 v - 18 v = 6 v the coil values needs to be at least 68 h outside the safe operating area the switching frequency, hysteretic peak current and associated power dissipation p tot of ild4035 will increase be yond the maximum ratings. 0 5 10 15 20 25 30 35 40 45 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 v s - v fled [v] average led current i led [a] 47 h 68 h 100 h 150 h 220 h 330 h
ild4035 350 ma step down led driver electrical characteristics data sheet 14 revision 2.0, 2011-08-17 5 electrical characteristics 5.1 dc characteristics all parameters at t a = 25 c, unless otherwise specified. v s = 12 v, 3 leds, r sense = 303 m ( i led = 375 ma), l = 100 h, v en = 3 v, v fled = 3 v table 4 dc characteristics parameter symbol values unit note / test condition min. typ. max. supply voltage v s 4.5 ? 40 v overall current consumption open load i s open load 1.4 2.3 3.1 ma v s =4.5v i led =0ma overall current consumption open load i s open load 1.5 2.4 3.2 ma v s =12v i led =0ma overall current consumption open load i s open load 1.8 3.0 3.9 ma v s =40v i led =0ma overall standby current consumption i s standby ??1a v en =0v; v s =12v overall standby current consumption i s standby ??5 a v en =0v; v s =40v enable voltage for standby mode v en -0.3 ? 0.4 v enable voltage for analog dimming v en 1 ? 2 v linear dimming range input current of multifunctional control pin i en ? 50 140 a v en =3v v s =4.5..40v current of sense input i sense ?20? a at any led current over temperature protection t s,tsd ?113?c t s for 10 % i led reduction, defined by t j
ild4035 350 ma step down led driver electrical characteristics data sheet 15 revision 2.0, 2011-08-17 5.2 switching characteristics all parameters at t a = 25 c, unless otherwise specified. v s = 12 v, 3 leds, r sense = 303 m ( i led = 375 ma), l = 100 h, v en = 3 v, v fled = 3 v 5.3 digital signals all parameters at t a = 25 c, unless otherwise specified. table 5 switching characteristics parameter symbol values unit note / test condition min. typ. max. switching frequency f switch ?120?khz maximum switching frequency f switch max ? ? 500 khz for any coil value mean current sense threshold voltage v sense ?114?mv sense threshold hysteresis v sensehys ? 7.5 ? % residual voltage at collector of power transistor v switch on ? 1.1 ? v output switch turned on output current accuracy i outacc ? 3? % table 6 digital control pa rameter at pin en/pwm parameter symbol values unit note / test condition min. typ. max. input voltage for power on v on 2.5 3 40 v full led current input voltage for power off v off -0.3 ? 0.4 v min. power on puls duration t on 10 ? s
ild4035 350 ma step down led driver basic application information data sheet 16 revision 2.0, 2011-08-17 6 basic application information this section covers the basic information required for calculating the parameters for a certain led application. for detailed application information please check the application note an215 (driving 1 w leds with ild4035) or visit our web site http://www.infineon.com/led.appnotes 6.1 setting the average led current the average output current for the leds is set by the external sense resistor r sense . to calculate the value of this resistor a first approximation can be calculated using equation (2) . v sense is dependent on the supply voltage v s and the number of leds in series. (2) example calculation 1 v s = 12 v, 100 h, v fled = 3 v, 3 leds in series v sense = 114 mv i led = 375 ma r sense = 303 m example calculation 2 v s = 24 v, 100 h, v fled = 3 v, 6 leds in series v sense = 106 mv i led = 350 ma r sense = 303 m an easy way to achieve these resistor values is to connect standard resistors in parallel 6.2 dimming of the leds analog voltage dimming the voltage level of the en/pwm pin can be used for analog dimming of the led current. to achieve a linear change in led current versus control voltage the recommended voltage range at the en/pwm pin is 1 v to 2 v. the maximum achievable led curr ent is defined by resistor r sense . the maximum led current will be achieved for v en 2.5 v. below 0.4 v the ild4035 is set to standby mo de and the output is switched off. the typical dimming performance is shown in below figures. led sense sense i v r =
ild4035 350 ma step down led driver basic application information data sheet 17 revision 2.0, 2011-08-17 pwm dimming besides the analog dimming functionality the en/pwm pin acts as input for a pulse width modulated (pwm) signal to control the dimming of the led string. for pwm dimming the signal's logic high level should be at least 2.5 v and the pwm frequency should be lower than 5 khz. for the ild4035/4001 demo board a dimming frequency less than 330 hz is recommended to maintain a maximum contra st ratio of 100:1. the ac hieveable contrast ratio is shown on figure 4 based on the measured average led current deviating 3 db from the linear reference. the maximum contrast ratio depends mainly on the rise time of the inductor current and is thus dependent on supply voltage, inductor size and led string forward voltage. i led versus v en , t a =25 c i led (relative) versus v en , t a =25 c i led versus v en , 333 m ? , 100 h 0 0.1 0.2 0.3 0.4 1 1.5 2 2.5 3 i led [a] v en [v] 303 m , 100 h 333 m , 100 h 600 m , 100 h 1200 m , 220 h 0 10 20 30 40 50 60 70 80 90 100 110 1 1.5 2 2.5 3 i led [%] v en [v] 303 m , 100 h 333 m , 100 h 600 m , 100 h 1200 m , 220 h 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 1 1.5 2 2.5 3 i led [a] v en [v] -40 c 25 c 85 c 105 c
ild4035 350 ma step down led driver basic application information data sheet 18 revision 2.0, 2011-08-17 figure 4 pwm dimming 1 10 100 1000 100 1000 10000 contrast ratio pwm dimming frequency [hz]
ild4035 350 ma step down led driver basic application information data sheet 19 revision 2.0, 2011-08-17 6.3 temperature protection circuit ild4035 incorporates a temperature protection circuit refe rring to the junction temperature of ild4035. the higher the junction temperature of ild4035 the lower the curren t of the leds. this feature helps to reduce the power dissipation of ild403 5 and the leds. yet still the prod uct specific maximum ratings for junction te mperature need to be observed to avoid a permanent damage of the devices. ild4035 has been characterized on ild4035/4001 applicat ion board heated from the backside without additional air flow on the circuit board surface besides natural convection. design and layout of the circuit board as well as the air flow influence the therma l resistance junction to ambient r thja of ild4035 and thus its junction temperature. below figures show the led current versus soldering point temperature t s . 6.4 switching parameters for all shown parameters ild4035 has been meas ured on evaluation board ild4035/4001 at t a = 25 c. used leds have a typical forward voltage v fled of 3 v. for details see application note an215 (driving 1w leds with ild4035) or visit our web site http ://www.infineon.com/lowcostleddrivers. led current versus t s , v s = 12 v led current (relative) versus t s , v s = 12 v 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 40 50 60 70 80 90 100 110 120 130 i led [a] t s [ c] 303 m , 100 h 333 m , 100 h 600 m , 100 h 1200 m , 220 h 70 80 90 100 110 40 50 60 70 80 90 100 110 120 130 i led [%] t s [ c] 303 m , 100 h 333 m , 100 h 600 m , 100 h 1200 m , 220 h
ild4035 350 ma step down led driver basic application information data sheet 20 revision 2.0, 2011-08-17 r sense = 303 m ? , l= 47 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.25 0.3 0.35 0.4 0.45 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 21 revision 2.0, 2011-08-17 r sense = 303 m ? , l= 68 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.25 0.3 0.35 0.4 0.45 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 22 revision 2.0, 2011-08-17 r sense = 303 m ? , l= 100 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.25 0.3 0.35 0.4 0.45 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 23 revision 2.0, 2011-08-17 r sense = 303 m ? , l= 220 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.25 0.3 0.35 0.4 0.45 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 24 revision 2.0, 2011-08-17 r sense = 367 m ? , l= 47 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.2 0.25 0.3 0.35 0.4 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 25 revision 2.0, 2011-08-17 r sense = 367 m ? , l= 68 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.2 0.25 0.3 0.35 0.4 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 26 revision 2.0, 2011-08-17 r sense = 367 m ? , l= 100 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.2 0.25 0.3 0.35 0.4 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver basic application information data sheet 27 revision 2.0, 2011-08-17 r sense = 367 m ? , l= 220 h i led versus v s and number of leds f switch versus v s and number of leds efficiency versus v s and number of leds duty cycle versus v s and number of leds 0.2 0.25 0.3 0.35 0.4 0 5 10 15 20 25 30 35 40 45 i led [a] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 100 200 300 400 500 0 5 10 15 20 25 30 35 40 45 f switch [khz] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 60 65 70 75 80 85 90 95 100 0 5 10 15 20 25 30 35 40 45 efficiency [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds 0 20 40 60 80 100 0 5 10 15 20 25 30 35 40 45 duty cycle [%] v s [v] 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 9 leds 10 leds
ild4035 350 ma step down led driver application circuit data sheet 28 revision 2.0, 2011-08-17 7 application circuit figure 5 application circuit 8 evaluation board figure 6 ild4035 on evaluation board en / pwm vs 6 5 4 3 2 1 i / v vr e f vstab vref vstab vstab vstab tpc ild4035 rsense
ild4035 350 ma step down led driver package information data sheet 29 revision 2.0, 2011-08-17 9 package information figure 7 package outline sc74 figure 8 recommended pcb footprint for reflow soldering figure 9 tape loading 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
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