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june 2013 ? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 fl7701 smart led lamp driver ic with pfc function fl7701 s mart led lamp driver ic with pfc function features ? digital ly implemented active pfc function (no additional circuit necessary for high pf) ? built-in hv supplying circuit: self biasing ? application input range: 80 v ac ~ 30 8 v ac ? aocp f unc tion with auto-restart m ode ? built- in over-temperature protection function ? cycle- by -cycle current limit ? current-sense p in o pen protection ? low operating current: 0.85 ma (t yp ical) ? under-voltage lockout with 5 v hysteresis ? programmable oscillation frequency ? programmable led current ? analog dimming function ? soft-start function ? precise internal reference: 3% applications ? led lamp for decorative lighting ? led lamp for low-power lighting description the fl7701 led lamp driver is a simple ic with pfc function . the special adopted digital technique of the ic can automatically detect input voltage condition and send an internal reference signal for achieving high power factor. when ac input is applied to the ic, pfc function is automatically enabled. otherwise, when dc input is applied to the ic, pfc function is automatically disabled. the fl 7701 does not need a bulk capacitor (electrolytic capacitor) for supply rail stability, which can significantly affect to led lamp system. related resources ? evaluation board: febfl7701_l30u003a ordering information part number operating temperature range package packing method fl7701 mx - 40 c to + 125 c 8- lead , small outline integrated circuit (soic), jedec ms-012, .150-inch narrow b ody t ape & r eel
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 2 fl7701 smart led lamp driver ic with pfc function application diagram d1 fuse c1 c2 l1 r2 u1 cs out vcc rt hv nv gnd adim l2 l3 d2 r3 q1 c3 c4 r1 bd led figure 1. typical application block diagram gnd rt out hv vcc reference adim jfet aocp i ad uvlo q r s tsd leading edge blanking zcd dac soft start digital block cs oscillator -+ leb -+ time vcc zcd 2.5v 1 8 3 54 6 2 figure 2. block diagram
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 3 fl7701 smart led lamp driver ic with pfc function pin configuration cs out vcc rt hv nv gnd adim fl7701 figure 3. pin configuration pin definitions pin # name description 1 cs current sense . limits output current depending on the sensing resistor voltage . the cs pin is also used to set the led current regulation 2 out out . connects to the mosfet gate. 3 vcc vcc . supply pin for stable ic operation zcd signal detection used for accura te pfc function. 4 rt rt . programmable operating frequency using external resistor and the ic has pre-fixed frequency when this pin is open or floating. 5 adim analog dimming . connect to the internal current source and can change the output current using an external resistor. if adim is not used, it is recommended to connect a 0.1 f bypass capacitor between the adim and gnd. 6 gnd ground . ground for the ic . 7 nc no connection 8 hv high voltage . connect to the high voltage line and supply current to the ic
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 4 fl7701 smart led lamp driver ic with pfc function absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and s tressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommen ded operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. symbol parameter min. max. unit v cc ic supply voltage 20 v hv high voltage sensing 500 v i o+ /i o- peak drive output current (sourcing / sinking) 250 ma v adim analog dimming 5 v v rt rt pin voltage 5 v v cs allowable current sensing detection voltage 5 v t a operating ambient temperature range - 40 + 125 ? c t j operating junction temperature - 40 +150 ? c t stg storage temperature range -65 +150 ? c j a thermal resistance junction-air (1,2) 135 ? c /w p d power dissipation 660 mw esd electrostatic discharge capability human body model, jesd22-a114 2000 v charged device model, jesd22-c101 1000 notes: 1. thermal resistance test board . s ize: 76.2 mm x 114.3 mm x 1.6 mm (1s0p); jedec standard: jesd51-2, jesd51- 3. 2. assume no ambient airflow.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 5 fl7701 smart led lamp driver ic with pfc function electrical characteristics typical values are at t a = +25c. specifications to - 40 c ~ 12 5c are guaranteed by design based on final characterization results. symbol parameter conditions min. typ. max. unit v cc bias section v cc v cc regulator output voltage v hv =100 v dc 14 .0 15.5 17 .0 v v cc st+ uvlo positive going threshold v cc increasing 12 13 14 v v cc st - uvlo negative going threshold v cc decreasing 7 8 9 v v cchy uvlo hysteresis 4 5 6 v i hv hv pin current v hv =100 v dc , c l =150 pf , rt=o pen 0.85 1.10 ma i st startup current 120 150 a switching section f osc operating frequency r t =5.95 k 200 250 300 khz r t =87 k 16 20 24 khz r t open 40 .5 45 .0 49 .5 khz t min minimum on time 400 ns d max maximum duty cycle 50 % t l eb leading e dge blanking time (3) 350 ns v rt voltage reference of rt pin 1.5 v soft-start section t ss soft-start time (3) dc mode 48 60 72 ms ac mode 7 periods reference section v cs 1 internal reference voltage of cs p in dc m ode 0.3 54 0.365 0.3 76 v v cs 2 ac m ode (3) 0.485 0.5 00 0.515 protection section ovp vcc over-voltage protection on vcc p in 17.7 18.7 19.7 v v aocp abnormal ocp level at cs p in (3) 2.5 v t aocp abnormal detection time (3) 70 ns t tsdh thermal shutdown threshold (3) 140 150 c t tsdhy thermal shutdown threshold hysteresis (3) 50 c dimming section v adim(st+) analog dimming positive going threshold (3) 3.15 3.50 3.85 v v adim(st-) analog dimming negative going threshold (3) 0.50 0.75 v i ad internal current source for adim p in 9 12 15 a note: 3. these parameters, although guaranteed, are not 100% tested in production.
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 6 fl7701 smart led lamp driver ic with pfc function functional description the fl7701 is a basic pwm controller for buck converter topology in continuous conduction m ode (ccm) with intelligent pfc function using a digi tal control algorithm. the fl7701 has an internal self- biasing circuit that uses the high-voltage switching device. t he ic does not need an auxiliary powering path to the vcc pin typical in flyback control ics or psr product family . when the input voltage applied to the hv pin is over 25 v to 50 0 v, the fl7701 maintains a 15 .5 v dc voltage at the v cc pin for stable operation. the fl7701 has uvlo block functions such that when the v cc voltage rises higher than v cc st+, the internal uvlo block releases and starts operation. otherwise the v cc goes down to the v cc st - and ic operation stops . normally, the hysteresis function provides stable operation even if the input voltage is operating under the very noisy or unstable circumstances. the fl7701 has a smart internal digital block for determining input condition: ac or dc. w hen an ac source with 50 hz or 60 hz is applied to the ic, the ic automatically changes its internal reference signal, which is similar to input signal, for creating high power factor. otherwise, once the dc source connects to the ic, the internal reference immediately changes to dc. 1. soft-start function the fl7701 has an internal soft-start function to reduce inrush current at start up . when the ic start s operation following an internal sequence, the internal reference slowly increases for a pre-determined fixed time. after this transient period, the internal reference goes to a steady-state level. in this time, the ic continually tries to find phase information from the vcc pin. if the ic succeeds in get ting phase information, it automatically follows a similar shape reference made during the transient times, 7 periods. if not, the ic has a dc reference level. i l e d t / 2 = 1 / ( i n p u t f r e q u e n c y * 2 ) 7 * ( t / 2 ) n o r m a l o p e r a t i o n v b r i d g e figure 4. soft starting function in ac input m ode 2. internal pfc function: how to achieve high power factor the fl7701 has a simple, but smart, internal pfc function that does not require additional detection pins for detecting input phase information or an electrolytic capacitor for supply voltage stabilization. for achieving high pf, t he fl7701 does not use the rectification capacitor after the bridge diode. this is important because the ic instead uses fluctuation in the signal on the vcc pin. basically, the vcc pin, which is supplies power for the ic , has voltage ripple as well as the rectification voltage after bridge, changing voltage level according to the vcc capacitor value. using this kind of voltage fluctuation on the vcc pin, the ic can detect the time reference and create the internal zcd signal. for prec is e and reliable internal reference for input voltage signal, the fl7701 uses a digital technique (sigma/delta modulation) and creates a new internal signal (dac_out) that has the same phase as the input voltage, as shown in figure 5. this signal enters the final comparator and is compared with current information from the sensing resistor. dac_out j f e t o u t p u t v o l t a g e bridge diode output voltage input voltage peak zcd t t t vcc v d d c h a r g i n g v o l t a g e j f e t o u t p u t v o l t a g e t v bridge figure 5. internal pfc function 3. self-biasing function the self-biasing function, using an hv device, can supply enough operating current to the ic and guarantee similar startup time across the whole inpu t voltage range (8 0 v~ 308 v ac ). however, self-biasing has a weakness in high -voltage condition. normally, the hv device acts as constant current source, so t he internal hv device has power loss when high input voltage connects to the hv pin. this power loss is proportional to input voltage. to reduce this power loss, one of the possible solutions is an additional resistor between the input voltage source and the hv pin, as shown in figure 6 . u1 out hv cs gnd bridge diode adim rt vcc emi filter figure 6. high-voltage application
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 7 fl7701 smart led lamp driver ic with pfc function 4. dimming function the fl7701 uses the adim pin for analog or 0 v to 10 v dimming by using a resistive divider. the peak voltage of internal reference, which is dac_out signal in figure 5, is changed by the v adim level, as shown in figure 7, and has different peak level according to the operating mode. figure 7. v adim vs . v dac_out(peak) 5. inductor design the fl7701 prefixed internal duty ratio range is below 50% , or around 4 00 ns , from timing point of view. the range is dependent on the input voltage and led numbers in its string. minimum duty is calculated as: (max) min in f v vn d ? ? ? ? (1) where: is efficiency of system; v in (max) is maximum input voltage ; v f is forward drop voltage of led; and n is led number in series connection. a v e r a g e l e d c u r r e n t c u r r e n t l i m i t t o n t o f f d m i n 1 - d m i n ? i r i p ( a ) d c m m o d e ( b ) c c m m o d e t on t off d min 1-d min ? i dcm dcm ccm 0.5 ? i 0.5 ? i current peak at led current maximum point (i led(peak) ) current min at led current maximum point (i led(min) ) average led current (i led(ave) ) current peak at led average current maximum point (i led(ave.peak) ) figure 8. dcm and ccm operation in dcm m ode , inductance is: ][ ) 1( min h i f d vn l rip s f m ?? ? ? ? ? (2) if the peak current is fixed at 350 ma pk, t he formula for the peak current is: 2 ).( rip con peak ave led i i i ? ? ?? [ a] (3) in fl7701, the led rms current determines the inductance parameter. to drive for ccm mode, define led rms current first, as: 2 ).( )( peak ave led rms led i i ? [ a] (4) substituting equation (2) for equation (4), the inductance of inductor is ob tained. v b r i d g e v d r a i n i l e d v i n v l e d d a c i f r d i m o s f e t i i n p u t t / 2 = 1 / ( i n p u t f r e q u e n c y * 2 ) t = 1 / i n p u t f e r q u e n c y v d d c h a r g i n g v o l t a g e b r i d g e d i o d e o u t p u t v o l t a g e i n p u t v o l t a g e p e a k z c d 2 3 4 i n p u t v o l t a g e p e a k i n p u t v o l t a g e p e a k t t t t t t t t t t figure 9. typical performance characteristics v adim v dac _ out ac mode dc mode 0 . 5 v 0 . 365 v 3 . 5 v 0 . 5 v
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 8 fl7701 smart led lamp driver ic with pfc function example application circuits d1 fuse c1 c2 l1 r2 u1 cs out vcc rt hv nv gnd adim l2 l3 d2 r3 q1 c3 c4 r1 bd led figure 10. application without an electrolytic capacitor d1 fuse c1 c2 l1 r2 u1 cs out vcc rt hv nv gnd adim l2 l3 d2 r3 q1 c3 c4 r1 bd led c5 figure 11. application with an electrolytic ca pacitor
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 9 fl7701 smart led lamp driver ic with pfc function typical characteristics -40 -20 0 20 40 60 80 100 120 14.0 14.5 15.0 15.5 16.0 16.5 17.0 vcc [ v ] temperature [ c ] -40 -20 0 20 40 60 80 100 120 4.0 4.5 5.0 5.5 6.0 vcc hy [ v ] temperature [ c ] figure 12. v cc vs. temperature figure 13. vcc hy vs. temperature -40 -20 0 20 40 60 80 100 120 12.0 12.5 13.0 13.5 14.0 vcc st+ [ v ] temperature [ c ] -40 -20 0 20 40 60 80 100 120 100 110 120 130 140 150 i st [ ua ] temperature [ c ] figure 14. vcc st+ vs. temperature figure 15. i st vs. temperature -40 -20 0 20 40 60 80 100 120 7.0 7.5 8.0 8.5 9.0 vcc st- [ v ] temperature [ c ] -40 -20 0 20 40 60 80 100 120 42 44 46 48 50 f osc [ khz ] temperature [ c ] figure 16. vcc st - vs. temperature figure 17. f osc vs. temperature (r t =open)
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 10 fl7701 smart led lamp driver ic with pfc function typical characteristics -40 -20 0 20 40 60 80 100 120 16 18 20 22 24 f osc [ khz ] temperature [ c ] -40 -20 0 20 40 60 80 100 120 48 49 50 51 52 d max temperature [ c ] figure 18. f osc vs. temperature (r t =87 k ) figure 19. d max vs. temperature -40 -20 0 20 40 60 80 100 120 200 220 240 260 280 300 f osc [ khz ] temperature [ c ] -40 -20 0 20 40 60 80 100 120 1.3 1.4 1.5 1.6 1.7 v rt temperature [ c ] figure 20. f osc vs. temperature (r t =5.95 k ) figure 21. v rt vs. temperature -40 -20 0 20 40 60 80 100 120 300 350 400 450 500 t min temperature [ c ] -40 -20 0 20 40 60 80 100 120 0.356 0.360 0.364 0.368 0.372 0.376 v cs1 temperature [ c ] figure 22. t min vs. temperature figure 23. v cs1 vs. temperature
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 11 fl7701 smart led lamp driver ic with pfc function typical characteristics -40 -20 0 20 40 60 80 100 120 18.0 18.5 19.0 19.5 ovp vcc temperature [ c ] -40 -20 0 20 40 60 80 100 120 9 10 11 12 13 14 15 i ad [ua] temperature [ c ] figure 24. ovp vcc vs. temperature figure 25. . i ad vs. temperature
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 12 fl7701 smart led lamp driver ic with pfc function physical dimensions 8 0 see detail a notes: unless otherwise specified a) this package conforms to jedec ms-012, variation aa. b) all dimensions are in millimeters. c) dimensions do not include mold flash or burrs. d) landpattern standard: soic127p600x175-8m. e) drawing filename: m08arev14 f) fairchild semiconductor. land pattern recommendation seating plane c gage plane x 45 detail a scale: 2:1 pin one indicator 4 8 1 b 5 a 5.60 0.65 1.75 1.27 6.20 5.80 3.81 4.00 3.80 5.00 4.80 (0.33) 1.27 0.51 0.33 0.25 0.10 1.75 max 0.25 0.19 0.36 0.50 0.25 r0.10 r0.10 0.90 0.40 (1.04) option a - bevel edge option b - no bevel edge 0.25 c b a 0.10 figure 26. 8-lead, small-outline integrated circuit (soic), jedec ms-012, .150-inch narrow body package drawings are provided as a service to customers considering fairchild components. drawings may change in any ma nner without notice. please note the revision and/or date on th e drawing and contact a fairchild semiconductor representa tive to verify or obtain the most recent revision. package specifications do not expand the terms of f airchilds worldwide terms and conditions, specific ally the warranty therein, which covers fairchild produc ts. always visit fairchild semiconductors online packa ging area for the most recent package draw ings: http://www.fairchildsemi.com/packaging/ .
? 2011 fairchild semiconductor corporation www.fairchildsemi.com fl7701 ? rev. 1.0.4 13 fl7701 smart led lamp driver ic with pfc function
www. onsemi.com 1 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 semiconductors 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 customers 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. publication 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 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 www.onsemi.com 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 localsales representative ? semiconductor components industries, llc

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