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xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 1 features n wide 8v to 40v input voltage range n output adjustable from 1.25v to 37v n minimum drop out 0.3v n fixed 150khz switching frequency n maximum 3a switching current n internal optimize power mosfet n excellent line and load regulation n with output constant current loop n built in thermal shutdown function n built in current limit function n built in input over voltage protection n recommend output power less than 13w n sop8-ep (exposed pad) package applications n car charger n battery charger n lcd monitor and lcd tv n portable instrument power supply n telecom / networking equipment n buck constant current driver n monitor led backlighting n general purpose led lighting general description the xl4201 is a 150khz fixed frequency pwm buck (step-down) dc/dc converter, capable of driving a 2.5a 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 enable function, an over current protection function is built inside. an internal compensation block is built in to minimize external component count. figure1. package type of xl4201
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 2 pin configurations figure2. pin configuration of xl4201 (top view) table 1 pin description pin number pin name description 1, 6 nc not connected. 2 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 .) 3 gnd ground pin. 4 fb feedback pin (fb). through an external resistor divider network, feedback senses the output voltage and regulates it. the feedback threshold voltage is 1.25v. 5 cs output current sense pin; (iload=0.11v/rcs) 7 vc internal voltage regulator bypass capacity. in typical system application, the vc pin connect a 1uf capacity to vin. 8 vin supply voltage input pin. xl4201 operates from a 8v to 40v dc voltage. bypass vin to gnd with a suitably large capacitor to eliminate noise on the input. the back exposed pad is sw.
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 3 function block figure3. function block diagram of xl4201 typical application circuit (car charger) figure4. xl4201 typical application circuit (li battery charger)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 4 typical system circuit(buck led constant current driver) xl4201 cin 100uf/50v cout 220uf/35v r2 1% r1 3k 1% c1 105 c2 105 8 2 5 4 vin 8v~40v 7 iled=0.11v/rcs led ovp=1.3*vout=1.25*(1+r2/r1) vin vc sw cs fb cc 105 gnd 3 l1 100uh/3a d1 b540c rcs 1% figure5. xl4201 typical application circuit(led constant current driver) ordering information part number marking id package temperature range lead free lead free packing type sop8-ep -40 ~ 85 XL4201E1 XL4201E1 2500 units 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 fb pin voltage v fb -0.3 to vin v sw pin voltage v sw -0.3 to vin v power dissipation p d internally limited mw thermal resistance (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.
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 5 xl4201 electrical characteristics t a = 25 ;unless otherwise specified. symbol parameter test condition min. typ. max. unit system parameters test circuit figure4 vfb feedback voltage vin = 8v to 40v, vout=5v iload=0.2a to 2a 1.231 1.25 1.269 v efficiency ? vin=12v ,vout=5v iout=2.4a - 89 - % 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 vin operation voltage vin 8 40 v vin uvlo vuvlo 5 v vin ovp vovp 45 v quiescent supply current i q v fb =vin 2 5 ma oscillator frequency fosc 127 150 172 khz switch current limit i l v fb =0 3.5 a output power pmos rdson v fb =0v, vin=12v, i sw =3a 75 100 mohm constant current sense voltage v cs 104.5 110 115.5 mv
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 6 typical system application (car charger) figure6. xl4201 system parameters test circuit (vin=8v~40v, vout=5v/0.1a~2.5a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 output voltage vs output current output voltage(v) output current(a) vin=8v,vout=5v,iout=0.1a~2.5a vin=12v,vout=5v,iout=0.1a~2.5a vin=24v,vout=5v,iout=0.1a~2.5a vin=36v,vout=5v,iout=0.1a~2.5a 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 40 45 50 55 60 65 70 75 80 85 90 95 100 efficiency vs output current efficiency(%) output current(a) vin=8v,vout=5v,iout=0.1a~2.4a vin=12v,vout=5v,iout=0.1a~2.4a vin=24v,vout=5v,iout=0.1a~2.4a vin=36v,vout=5v,iout=0.1a~2.4a figure7. output constant current curve figure8. efficiency curve 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 4.7 4.8 4.9 5.0 5.1 5.2 5.3 output voltage vs output current output voltage(v) output current(a) vin=8v,vout=5v,iout=0.1a~2.4a vin=12v,vout=5v,iout=0.1a~2.4a vin=24v,vout=5v,iout=0.1a~2.4a vin=36v,vout=5v,iout=0.1a~2.4a -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=5v,iout=1.0a normalized at ta=25 figure9. line&load regulation curve figure10. frequency change curve
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 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 feedback voltage change vs temperature feedback voltage change(%) temperature( ) vin=12v,vout=5v,iout=1.0a normalized at ta=25 note2 figure11. feedback voltage change curve note 2 : internal temperature compensation circuitry is provided to compensation the pcb and external line loss in system application. when the junction temperature or the output power rise the feedback voltage will be compensated. this function is provided to compensation the pcb and external line loss in system application.
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 8 typical system application (recommend output voltage safe work range in led application) 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=330ma 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 recommend output voltage safe work range ouput voltage(v) input voltage(v) iout=660ma figure12.max output voltage(iout=330ma) figure13.max output voltage(iout=660ma) 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=1000ma 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 figure14.max output voltage(iout=1000ma) figure15.max output voltage(iout=2000ma)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 9 typical system circuit(vin=8v~36v,iout=330ma) xl4201 cin 100uf/50v cout 100uf/50v r2 86k 1% r1 3k 1% c1 105 c2 105 8 2 5 4 vin 8v~40v 7 iled=0.11v/rcs led ovp=1.3*vout=1.3*{1.25*(1+r2/r1)} vin vc sw cs fb cc 105 gnd 3 l1 100uh/3a d1 b540c rcs 0.33 1% figure16. xl4201 system parameters test circuit (vin=8v~40v,iout=330ma) 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=330ma vin=12v,iout=330ma vin=24v,iout=330ma vin=36v,iout=330ma figure17. xl4201 system efficiency curve (vin=8v~40v,iout=330ma)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 10 typical system circuit(vin=8v~40v,iout=660ma) xl4201 cin 100uf/50v cout 220uf/35v r2 60k 1% r1 3k 1% c1 105 c2 105 8 2 5 4 vin 8v~40v 7 iled=0.11v/rcs led ovp=1.3*vout=1.3*{1.25*(1+r2/r1)} vin vc sw cs fb cc 105 gnd 3 l1 100uh/3a d1 b540c rcs 0.165 1% figure18. xl4201 system parameters test circuit (vin=8v~40v,iout=660ma) 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=660ma vin=12v,iout=660ma vin=24v,iout=660ma vin=36v,iout=660ma figure19. xl4201 system efficiency curve (vin=8v~40v,iout=660ma)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 11 typical system circuit(vin=8v~40v,iout=1000ma) xl4201 cin 100uf/50v cout 220uf/35v r2 39k 1% r1 3k 1% c1 105 c2 105 8 2 5 4 vin 8v~40v 7 iled=0.11v/rcs led ovp=1.3*vout=1.3*{1.25*(1+r2/r1)} vin vc sw cs fb cc 105 gnd 3 l1 100uh/3a d1 b540c rcs 0.11 1% figure20. xl4201 system parameters test circuit (vin=8v~40v,iout=1000ma) 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=1000ma vin=12v,iout=1000ma vin=24v,iout=1000ma vin=36v,iout=1000ma figure21. xl4201 system efficiency curve (vin=8v~40v,iout=1000ma)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 12 typical system circuit(pwm dimming) figure22. xl4201 system parameters test circuit schottky diode selection table current surface mount through hole vr (the same as system maximum input voltage) 20v 30v 40v 50v 60v 1a 1n5817 1n5818 1n5819 1n5820 1n5821 1n5822 mbr320 mbr330 mbr340 mbr350 mbr360 sk32 sk33 sk34 sk35 sk36 30wq03 30wq04 30wq05 31dq03 31dq04 31dq05 3a sr302 sr303 sr304 sr305 sr306 1n5823 1n5824 1n5825 sr502 sr503 sr504 sr505 sr506 sb520 sb530 sb540 sb550 sb560 sk52 sk53 sk54 sk55 sk56 5a 50wq03 50wq04 50wq05
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 13 package information (sop8-ep)
xlsemi datasheet 3a 150khz 40v buck dc/dc converter with constant current loop xl4201 rev2.0 www.xlsemi.com 14 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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