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datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 1 features n wide 8v to 40v input voltage range n output current sence voltage is 0.21v n maximum duty cycle 100% n minimum drop out 0.3v n fixed 220khz switching frequency n 3a constant output current capability n internal optimize power mosfet n high efficiency n excellent line and load regulation n built in thermal shutdown function n built in current limit function n built in output short protection function n available in sop8-ep package applications n buck constant current driver n monitor led backlighting n general purpose led lighting general description the xl3001 is a 220 khz fixed frequency pwm buck (step-down) led constant current driver, capable of driving a 3a load with high efficiency, low ripple and excellent line and load regulation. requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator. the pwm control circuit is able to adjust the duty ratio linearly from 0 to 100%. an over current protection function is built inside. when short protection function happens, the operation frequency will be reduced from 220khz to 60khz. an internal compensation block is built in to minimize external component count. figure1. package type of xl3001
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 2 pin configurations figure2. pin configuration of xl3001 (top view) table 1 pin description pin number pin name description 1 cs output constant current sense pin (cs). the cs reference voltage is 0.21v. 2 nc not connected. 3 vc internal voltage regulator bypass capacity. in typical system application, the vc pin connect a 1uf capacity to vin. 4 vin supply voltage input pin. xl3001 operates from a 8v to 40v dc voltage. bypass vin to gnd with a suitably large capacitor to eliminate noise on the input. 5,6 sw power switch output pin (sw). output is the switch node that supplies power to the output. (note: connected the back exposed pad to sw .) 7,8 gnd ground pin. care must be taken in layout. this pin should be placed outside of the schottky diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into xl3001. the back exposed pad is sw.
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 3 function block figure3. function block diagram of xl3001 typical application circuit figure4. xl3001 typical application circuit
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 4 ordering information order information marking id package type packing type supplied as XL3001E1 XL3001E1 sop8-ep 2500 units on tape & reel xlsemi pb-free products, as designated with e1 suffix in the par number, are rohs compliant. absolute maximum ratings note1 parameter symbol value unit input voltage vin -0.3 to 45 v cs pin voltage v cs -0.3 to vin v output switch pin voltage v output -0.3 to vin v power dissipation p d internally limited mw thermal resistance (sop8-ep) (junction to ambient, no heatsink, free air) r ja 60 o c/w maximum junction temperature t j -40 to 150 o c operating junction temperature t j -40 to 125 o c storage temperature t stg -65 to 150 o c lead temperature (soldering, 10 sec) t lead 260 o c esd (hbm) >2000 v note1: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 5 xl3001 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure4 vcs current sense voltage vin = 8v to 40v, vout=6.4v iload=0.1a to 2a 203.7 210 216.3 mv ? efficiency vin=12v ,vout=10v iout=0.3a - 95 - % ? efficiency vin=24v ,vout=16v iout=0.6a - 96 - % ? efficiency vin=36v ,vout=19v iout=0.6a - 95 - % electrical characteristics (dc parameters) vin = 12v, gnd=0v, vin & gnd parallel connect a 100uf/50v capacitor; iout=500ma, t a = 25 ; the others floating unless otherwise specified. parameters symbol test condition min. typ. max. unit input operation voltage vin 8 40 v vin uvlo vin_uvlo 5 v vin ovp vin_ovp 45 v quiescent supply current i q v cs =vin 2.1 5 ma oscillator frequency fosc 187 220 253 khz output short frequency fosp 48 60 72 khz switch current limit i l v cs =0 3.5 a max. duty cycle d max v cs =0v 100 % output power pmos rdson v cs =0v, vin=12v, i sw =3a 75 100 mohm
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 6 typical system application (recommend output voltage safe work range) 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 recommend output voltage safe work range ouput voltage(v) input voltage(v) iout=300ma 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 recommend output voltage safe work range ouput voltage(v) input voltage(v) iout=600ma figure5.max output voltage(iout=300ma) figure6.max output voltage(iout=600ma) 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 0 2 4 6 8 10 12 14 16 18 20 recommend output voltage safe work range output voltage(v) input voltage(v) iout=900ma 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 0 2 4 6 8 10 12 recommend output voltage safe work range output voltage(v) input voltage(v) iout=1500ma figure7.max output voltage(iout=900ma) figure8.max output voltage(iout=1500ma) 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 0 2 4 6 8 10 recommend output voltage safe work range output voltage(v) input voltage(v) iout=2000ma -50 -25 0 25 50 75 100 125 -10 -8 -6 -4 -2 0 2 4 6 8 10 frequency change vs temperature frequency change(%) temperature( ) vin=12v,vout=6.4v,iout=308ma normalized at ta=25 figure9.max output voltage(iout=2000ma) figure10. frequency change curve
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 7 -50 -25 0 25 50 75 100 125 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0 cs voltage change vs temperature cs voltage change(%) temperature( ) vin=12v,vout=6.4v,iout=308ma normalized at ta=25 note2 figure11. cs voltage change curve note 2 : internal temperature compensation circuitry is providd to compensation the pcb and external line loss in system application. when the junction temperature or the output power rise the cs voltage will be compensated. this function is provided to compensation the pcb and external line loss in system application.
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 8 typical system application (vin=8v~40v, iout=308ma) figure12. xl3001 system parameters test circuit (vin=8v~40v, iout=308ma) 1 2 3 4 5 6 7 8 9 10 40 45 50 55 60 65 70 75 80 85 90 95 100 efficiency vs led string efficiency(%) led string(n*1w) vin=8v,iout=308ma vin=12v,iout=308ma vin=24v,iout=308ma vin=36v,iout=308ma figure13. xl3001 system efficiency curve
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 9 typical system application (vin=8v~40v, iout=615ma) figure14. xl3001 system parameters test circuit (vin=8v~40v, iout=615ma) 1 2 3 4 5 6 40 45 50 55 60 65 70 75 80 85 90 95 100 efficiency vs led string efficiency(%) led string(n*2w) vin=8v,iout=615ma vin=12v,iout=615ma vin=24v,iout=615ma vin=36v,iout=615ma figure15. xl3001 system efficiency curve
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 10 typical system application (vin=8v~40v, iout=925ma) figure16. xl3001 system parameters test circuit (vin=8v~40v, iout=925ma) 1 2 3 4 40 45 50 55 60 65 70 75 80 85 90 95 100 efficiency vs led string efficiency(%) led string(n*3w) vin=8v,iout=925ma vin=12v,iout=925ma vin=24v,iout=925ma vin=36v,iout=925ma figure17. xl3001 system efficiency curve
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 11 typical system application (pwm dimming) pwm dimming function can be used in typical system application with external components. changing the duty cycle of pwm signal can get different led current. the pwm signal high voltage above 3.3v(referenced to ground, lower than vin), low voltage below 0.2v(referenced to ground). xl3001 cin 100uf/50v cout 220uf/35v rcs l1 100uh/3a d1 b540c c1 105 c2 105 4 5,6 7,8 1 vin 3 iout=0.21v/rcs vin vc sw gnd cs cc 105 r1 2k d2 1n4148 pwm figure18. xl3001 system parameters test circuit (pwm dimming) typical system application (led ovp) led ovp function can be used in typical system application with external components. the output voltage can be limited in a suitable value by choose different zener diode when the output led open. the zener diode voltage choosed by output led voltage's 1.3 times. figure19. xl3001 system parameters test circuit (led ovp)
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 12 package information (sop8-ep)
datasheet 3a 220khz 40v buck led constant current driver xl3001 rev 1.2 www.xlsemi.com 13 important notice xlsemi reserve the right to make modifications, enhancements, improvements, corrections or other changes without notice at any time. xlsemi does not assume any liability arising out of the application or use of any product described herein; neither does it convey any license under its patent rights, nor the rights of others. xlsemi assumes no liability for applications assistance or the design of buyers products. buyers are responsible for their products and applications using xlsemi components. to minimize the risks associated with buyers products and applications, buyers should provide adequate design and operating safeguards. xlsemi warrants performance of its products to the specifications applicable at the time of sale, in accordance with the warranty in xlsemi s terms and conditions of sale of semiconductor products. testing and other quality control techniques are used to the extent xlsemi deems necessary to support this warranty. except where mandated by applicable law, testing of all parameters of each component is not necessarily performed. for the latest product information, go to www.xlsemi.com .

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