View FL7760_8981926.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

? semiconductor components industries, llc, 2017 april, 2018 ? rev. 4 1 publication order number: FL7760/d FL7760 high-side sensing constant current buck controller for high switching frequency led driver the FL7760 is a constant current step ? down ccm controller for wide output power led lighting applications. the FL7760 adapts hysteretic reference architecture that accurately regulates led current by sensing voltage across an external high side sense resistor. this control scheme can stabilize led current against input voltage and output load transient condition and implement optimal pwm and analog dimming control. time delay control method widens analog dimming range down to less than 5%. FL7760 has low 200 mv reference voltage to maximize system efficiency and high frequency driving capability so that system profile can be minimized in wide scale power ranges. the FL7760 implements pwm and analog dimming together through a dim pin and provides thermal shutdown (tsd), and under ? voltage lockout (uvlo) protections. features ? wide input range (8 vdc~70 vdc) ? continuous conduction mode operation ? hysteretic led current control ? wide analog dimming range down to 5% ? wide pwm dimming duty range to 0.2% at 2 khz pwm freq. ? high switching frequency up to 1 mhz ? high source / sink current of 1.5 a / 2.5 a ? cycle ? by ? cycle peak current limit ? low operating current (300 ua) ? low stand ? by current (240 ua) typical applications ? led lighting system sot23 ? 6ld case 527aj marking diagram www. onsemi.com see detailed ordering and shipping information on page 4 of this data sheet. ordering information 60xt (top view) vin sen gnd drv vcc 60 : production identifier x : version (a or b) t: wafer lot code week code year code
FL7760 www. onsemi.com 2 figure 1. application schematic for analog or pwm dimming dim gnd drv sen vin FL7760 line input maxim vdc 6 4 1 3 2 f1 lm dfrd c in q1 rsenh vcc 5 c vcc analog or pwm dimming signal 70 table 1. pin function description pin pin name function description 1 vin ic input connect to the high voltage input line and supply current to the ic. 2 gnd ground ground of ic. 3 dim analog / pwm / hybrid / dimming dim voltage determines led current regulation reference and switching is terminated when dim voltage is 0 v. if dimming function is not used, it is recommended to add a 0.1 f bypass capacitor between dim and gnd. 4 drv driver output connect to the mosfet gate. 5 vcc ic supply supply pin for ic operation. 6 sen current sense the sen pin is used to set the output led current regulation.
FL7760 www. onsemi.com 3 s r q 1 internal bias 3 vin dim gate driver 6 sen 2 gnd 5 vcc + s r q v dd good high side current sense + tsd v cc good 4 drv regulation + + standby 34 ms counter shutdown v sense 30mv 30mv 0.45/0.50v leb 3v max . clamping v rh v rl uvlo 6ua x1/15 s r q 1 internal bias 3 vin dim gate driver 6 sen 2 gnd 5 vcc + s r q v dd good high side current sense + tsd v cc good 4 drv regulation + + standby 34 ms counter shutdown v sense 30mv 30mv 0.45/0.50v leb 3v max . clamping v rh v rl uvlo 6ua x1/15 figure 2. block diagram a) a version (with time delay control) b) b version (without time delay control)
FL7760 www. onsemi.com 4 table 2. maximum ratings symbol rating value unit vin (max) maximum vin pin voltage range ? 0.3 to 70 v sen (max) maximum sen pin voltage range ? 0.3 to 70 v vcc (max) vcc pin voltage range ? 0.3 to 5.5 v vdim (max) dim pin voltage range ? 0.3 to 5.5 v vdrv (max) drv pin voltage range ? 0.3 to 5.5 v t j(max) maximum junction temperature 150 c t stg storage temperature range ? 65 to 150 c r ja junction ? to ? ambient thermal impedance 263 c/w p d power dissipation 247 mw esd hbm esd capability, human body model (note 2) 1.2 kv esd cdm esd capability, charged device model (note 2) 2 kv stresses exceeding those listed in the maximum ratings table may damage the device. if any of these limits are exceeded, device function ality should not be assumed, damage may occur and reliability may be affected. 1. refer to electrical characteristics, recommended operating ranges and/or application information for safe operating parameters 2. this device series incorporates esd protection and is tested by the following methods esd human body model tested per aec ? q100 ? 002 (eia/jesd22 ? a114) esd machine model tested per aec ? q100 ? 003 (eia/jesd22 ? a115) latchup current maximum rating: 150 ma per jedec standard: jesd78 table 3. ordering information device package shipping ? FL7760am6x 6ld,sot23, jedec mo ? 178 variation ab, 1.6mm wide tape & reel FL7760bm6x 6ld,sot23, jedec mo ? 178 variation ab, 1.6mm wide tape & reel table 4. recommended operating ranges rating symbol min max unit ambient temperature t a ? 40 125 c functional operation above the stresses listed in the recommended operating ranges is not implied. extended exposure to stresse s beyond the recommended operating ranges limits may affect device reliability. table 5. electrical characteristics (v cc = 5 v, for typical values t j = 25 c, for min/max values t j = ? 40 c to +125 c, max t j = 150 c, unless otherwise noted) characteristics condition symbol min typ max unit vin section self bias start threshold voltage v cc = 5 v v in,on 7.05 7.5 7.95 v self bias stop threshold voltage v cc = 5 v v in,off 6.55 7 7.45 v self bias current for startup (note 3) i st 2 ma vcc section vcc regulator output voltage v vin = 24 v dc v cc 4.5 5 5.5 v ic start threshold voltage v cc increasing v cc,on 4.04 4.50 4.95 v product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product performance may not be indicated by the electrical characteristics if operated under different conditions. 3. this item is guaranteed by design. 4. this is only a recommended specification and there is no limit to the pwm dimming frequency. 5. drift after ic reliability test (jedec jesd22 ? a08) is not included. 6. this value indicates the change in internal reference voltage with temperature change and indicates the rate of change based on 25 c ambient temperature. this item is guaranteed by design.
FL7760 www. onsemi.com 5 table 5. electrical characteristics (v cc = 5 v, for typical values t j = 25 c, for min/max values t j = ? 40 c to +125 c, max t j = 150 c, unless otherwise noted) characteristics unit max typ min symbol condition vcc section ic stop threshold voltage v cc decreasing v cc,off 3.03 3.50 3.96 v uvlo hysteresis v cc,hys 0.505 1.000 1.485 v operation current no switching i cc 51 300 495 ua stand ? by current (note 3) no switching i stby 0.1 0.24 0.4 ma gate section gate high voltage v gate,h 4.5 5 5.5 v gate low voltage v gate.l 0.5 v peak pull ? up current (note 3) v cc = 5 v i gate,pullup 1.5 a peak pull ? down current (note 3) v cc = 5 v i gate,pulldown 2.5 a recommended maximum operating frequency (note 55) f sw,max 1 mhz current ? sense and reference section internal reference voltage v dim = 3.5 v (t j = 25 c) v fb,dc 192 200 208 mv internal reference voltage drift (note 5) v dim = 3.5 v (t j = 25 c) v fb,dc,r 196 200 204 mv variation of v fb,dc for temperature (note 6) v dim = 3.5 v v fb,dc,t 118.2 uv/ c feedback reference voltage hysteresis v dim = 3.5 v v fb , hys 30 mv switching section minimum on ? time (note 3) t on,min 200 ns minimum off ? time (note 3) t off,min 200 ns dimming section maximum effective dimming voltage (note 3) v dim,max 2.7 3.0 3.3 v minimum effective dimming voltage v dim >v dim,r then decreased v dim,min 0.40 0.45 0.50 v dimming recovery voltage v dim,r 0.45 0.50 0.55 v internal sourcing current pull up to 3v i pull up,dim 5 6 7 ua delay time at 0.5 v dim (a version only, note 3) v dim = 0.5 v t delay.max 5.00 5.35 5.70 us delay time at 3 v dim (a version only, note 3) v dim = 3 v t delay.min 28.5 30.0 31.5 ns blanking time for standby mode (note 3) v dim = 0 v t blank.stby 28 34 40 ms thermal shut down section thermal shutdown temperature (note 3) 140 150 c hysteresis temperature of tsd (note 3) 30 c product parametric performance is indicated in the electrical characteristics for the listed test conditions, unless otherwise noted. product performance may not be indicated by the electrical characteristics if operated under different conditions. 3. this item is guaranteed by design. 4. this is only a recommended specification and there is no limit to the pwm dimming frequency. 5. drift after ic reliability test (jedec jesd22 ? a08) is not included. 6. this value indicates the change in internal reference voltage with temperature change and indicates the rate of change based on 25 c ambient temperature. this item is guaranteed by design.
FL7760 www. onsemi.com 6 typical characteristics figure 3. v cc vs. temperature figure 4. v cc ? on vs. temperature figure 5. v cc ? off vs. temperature figure 6. i cc vs. temperature figure 7. v fb ? high vs. temperature figure 8. v fb ? low vs. temperature 0 1 2 3 4 5 6 7 -40 -20 0 20 40 60 80 100 120 140 v cc (v) 0 1 2 3 4 5 6 7 -40 -20 0 20 40 60 80 100 120 140 v cc ? on (v) 0 1 2 3 4 5 6 7 -40 -20 0 20 40 60 80 100 120 140 v cc ? off (v) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -20 0 20 40 60 80 100 120 140 i cc (ma) 0 50 100 150 200 250 300 350 -40 -20 0 20 40 60 80 100 120 140 v fb ? high (mv) 0 50 100 150 200 250 300 350 -40 -20 0 20 40 60 80 100 120 140 v fb ? low (mv) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c)
FL7760 www. onsemi.com 7 typical characteristics (continued) 10 15 20 25 30 35 40 45 -40 -20 0 20 40 60 80 100 120 140 v fb ? hys ( mv) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -20 0 20 40 60 80 100 120 140 v dim ? min (mv) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 -40 -20 0 20 40 60 80 100 120 140 v dim ? r (mv) 6.6 6.8 7.0 7.2 7.4 7.6 7.8 8.0 8.2 8.4 8.6 -40 -20 0 20 40 60 80 100 120 140 v in ? on (v) 6.0 6.2 6.4 6.6 6.8 7.0 7.2 7.4 7.6 7.8 8.0 -40 -20 0 20 40 60 80 100 120 140 v in ? off (v) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 -40 -20 0 20 40 60 80 100 120 140 v in ? hys (v) figure 9. v fb ? hys vs. temperature figure 10. v dim ? min vs. temperature figure 11. v dim ? r vs. temperature figure 12. v in ? on vs. temperature figure 13. v in ? off vs. temperature figure 14. v in ? hys vs. temperature t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c) t j , junction temperature ( c)
FL7760 www. onsemi.com 8 application information general the FL7760 is a step down hysteretic led current controller that is easily configured in varies input voltage range from 8 v to 70 v. the converter employs a high side current sensing resistor to detect and regulate the led current. analog, pwm and hybrid dimming can be easily implemented with single dim pin. in addition, the time delay control operation can realize analog dimming less than 5%. continuous conduction mode regulation the FL7760 employs hysteretic reference architecture that accurately regulates led current by detecting an external high ? side current ? sense resistor voltage. the voltage across the current sensing resistor is kept measured and regulated in 200 mv 15% range. this control scheme performs stable led current regulation at input voltage and load transient conditions.. figure 15. ccm operation with hysteresis v vin ? v sen high reference low reference gate vin biasing at startup internal vin biasing circuit quickly charges external vcc capacitor to begin ic operation. during the initial start ? up, the vcc pin voltage gradually increases, and when the voltage reaches 4.5 v, the ic starts operating by vcc good signal. figure 16. start up and regulation v vin ? v sen high reference low reference gate 7.5v 7v v in v dim cross over distortion cross over distortion led v f vcc 4.5v 4v thereafter, the internal current source in the dim pin pulls up the dim voltage and internal hysteresis reference is enabled with gate switching. although the gate signal is generated and the mosfet is turned on, the led current is still close to zero in the crossover distortion area where the input voltage is lower than the led forward voltage. soft start the hysteric reference voltage to regulate led current is proportional to dim voltage. internal current source [6 ua] charges an exter nal capacitor connected at dim pin and soft start time can be programmable with capacitances. soft start time can be calculated as below equation. t softstart c dim 3v 6ua (eq. 1) v in v dim v vin ? v sen high reference low reference figure 17. soft start with dim pin resistor v in v dim v vin ? v sen high reference low reference figure 18. soft start with dim pin capacitor although soft start is not preferred, small filtering capacitor (~ hundreds pf) at dim pin is recommended for noise immunity. pwm dimming signal delivered from an external pwm generator can be filtered by the capacitor, so the capacitor value needs to be carefully selected by considering an output impedance of pwm signal generator. analog dimming when dim voltage is higher than 3 v, hysteretic reference voltage is set to 200 mv 30 mv. this hysteretic reference condition limits led current ripple spec of 15% without storage capacitor in parallel with the led string. the control range of the dim pin in analog dimming is from 3 v to 0.5 v. as dim voltage decreases, hysteretic
FL7760 www. onsemi.com 9 references are reduced accordingly with the fixed +/ ? 30 mv hysteresis. to perform wide analog dimming range to less than 5%, the FL7760 has time delay control (built in version a) with hysteresis control. in this delay control method, gate is not turned on during the delay time determined by dim voltage once v vin ? v sen reaches to the low reference. therefore, operating mode is entered into dcm (discontinuous current mode) that makes non ? linear dimming curve in low dim voltage range. therefore, for analog dimming application with wide dimming requirement, version a is recommended and for pwm dimming application with linear dimming curve, version b is preferred. 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 led current ratio [%] analog dimming voltage [v] figure 19. analog dimming curve pwm dimming if the dim pin voltage is less than 0.45 v for 1 us blanking time, FL7760 stops switching. when the dim voltage is up again over 0.5 v for the blanking time, switching begins. based on the blanking time, the minimum duty ratio for pwm dimming can be calculated as 0.2% for a 2 khz dimming signal. v dim t blank gate no gate 1us 1us 1us figure 20. pwm dimming hybrid dimming the FL7760 can implement hybrid dimming by adjusting amplitude and duty ratio of the single dim signal provided at dim pin. it provides wide dimming range with good dimming linearity. v fb.ref t i led t v dim t high side reference low side reference 3v 3v 60mv (200mv 30mv ) 230mv 170mv no dimming hybrid dimming (analog dim + pwm dim) analog dimming figure 21. hybrid dimming standby operation when the voltage of the dim pin falls below 0.45 v for 34 ms, standby mode is entered and the power consumption of the control circuitry is minimized. standby mode is terminated once dim voltage is over 0.5 v. v dim t blank.stby standby mode 34ms 0.45v gate normal mode normal mode stby mode 0.5v figure 22. standby mode thermal shut down if internal junction temperature is higher than 150 c, tsd protection is triggered and released with 30 c hysteresis. selection the input capacitor a low esr input capacitor reduces the surge current and switching noise drawn from the front end power supply. ceramic capacitors (100 ~ 120 nf) closely connected to vin and gnd pin can be effective in bypassing switching noise generated from front ? end power stage and FL7760 buck converter stage.
FL7760 www. onsemi.com 10 single layer pcb layout guidance dim gnd drv sen vin FL7760 6 4 1 3 2 lm dfrd c in bypass capacitor q1 rsenh vcc 5 c vcc analog or pwm dimming signal c dim bypass capacitor pg (power gnd) sg (signal gnd) c in elec ? capacitor c in bypass capacitor is closely connected to vin and gnd pins . c dim bypass capacitor is closely connected to dim and gnd pins . sensing resistor is connected close at vin and sen pins . vcc capacitor is connected close at vcc pin . sg and pg are combined and connected close at gnd pin . 1 2 3 4 5 1 2 3 4 5 5 figure 23. single layer pcb layout guidance
sot ? 23, 6 lead case 527aj issue b date 29 feb 2012 d a1 5 12 detail a l e1 b a detail a c scale 2:1 1 xxx m xxx = specific device code m = date code = pb ? free package *this information is generic. please refer to device data sheet for actual part marking. pb ? free indicator, ?g? or microdot ? ?, may or may not be present. generic marking diagram* dim min max millimeters a1 0.00 0.15 a2 0.90 1.30 b 0.20 0.50 c 0.08 0.26 d 2.70 3.00 e 2.50 3.10 e1 1.30 1.80 e 0.95 bsc l2 0.25 bsc l notes: 1. dimensioning and tolerancing per asme y14.5m, 1994. 2. controlling dimension: millimeters. 3. datum c is the seating plane. 0.20 0.60 (note: microdot may be in either location) a --- 1.45 3 64 e a2 side view top view end view a s a m 0.20 6x seating plane b c s b e *for additional information on our pb ? free strategy and soldering details, please download the on semiconductor soldering and mounting techniques reference manual, solderrm/d. soldering footprint* 3.30 0.95 0.85 6x dimensions: millimeters 0.56 pitch 6x recommended 0.10 c c 6x seating plane l2 gage plane mechanical case outline package dimensions http://onsemi.com 1 ? semiconductor components industries, llc, 2002 october, 2002 ? rev. 0 case outline number: xxx document number: status: reference: description: 98aon34321e on semiconductor standard sot ? 23, 6 lead electronic versions are uncontrolled except when accessed directly from the document repository. printed versions are uncontrolled except when stamped ?controlled copy? in red. page 1 of 2
document number: 98aon34321e page 2 of 2 issue revision date o released for production from pod #sot236 ? 029 ? 01 to on semicon- ductor. req. by b. bergman. 19 dec 2008 a redrawn to jedec standards. req. by d. truhitte. 12 jan 2011 b corrected label for molded body dimension of top view to e1. req. by d. truhitte. 29 feb 2012 ? semiconductor components industries, llc, 2012 february, 2012 ? rev. b case outline number: 527aj on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to mak e changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for an y particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or specifications can and do vary in different application s and actual performance may vary over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its of ficers, employees, subsidiaries, af filiates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, direct ly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner.
on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent?marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does on semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. p ublication ordering information n. american technical support : 800?282?9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303?675?2175 or 800?344?3860 toll free usa/canada fax : 303?675?2176 or 800?344?3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your loc al sales representative ?

▲Up To Search▲

Price & Availability of FL7760

	To Download FL7760 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .