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confidential datasheet version 1.1 march2012 page1 MAP3202 C high efficiency switch mode led driver ordering information typical application part number top marking ambient temperature range package rohs status MAP3202sirh MAP3202 40 to+85 soic14pin halogenfree general description MAP3202 is a single channel high efficiency boost type pwm driver with current mode control. it is designedforhighbrightnessleddriveroptimizedf or backlightingsystemforlcdmodule. MAP3202offersthefunctionofaccurateandfastle d dimming control using pwm interface and external dimmingmosfet. MAP3202 has the overvoltage protection, the short current protection and uvlo, providing autorestart function. MAP3202 is available in soic14 pin package with halogenfree(fullyrohscompliant). formoreinformation,pleasecontactlocalmagnachi p salesofficeinworldwideorvisitmagnachip swebsite at www.magnachip.com . features wideinputvoltagerangeupto18v pwmdimming currentmodecontroltype synchronizationtopeertopeer internalautorestartmodeprotection programmableoutputovervoltageprotection ledshortcurrentprotection boostswitchcurrentlimitprotection package:soic14pin applications highbrightnesswhiteledbacklightingforlcd tvsandmonitors generalledlightingapplications datasheet - map 3202 high efficien cy switch mode led driver
confidential datasheet version 1.1 march2012 page2 MAP3202 C high efficiency switch mode led driver pin configuration 1 2 3 4 5 6 7 14 13 12 11 10 9 8 functional block diagram bg vcc good 1 10 5 s q r q s q r q 8 7 16 15 14 gm amp + 12 3 11 13 pwmi 4 gnd 4r r ck prot bg 8v / 7v vcc good 2 vcc 8 ref 5v 5 cs blanking s q r q s r q 7 sync 6 rt 14 fbn 13 fbp 12 comp gm amp + 10 ovp 3v / 2.7v 3 gate 9 pwmo 11 4 oscillator 4r r vcc good prot fbp x 2.5 1 1 en off on enable ref + + ck
confidential datasheet version 1.1 march2012 page3 MAP3202 C high efficiency switch mode led driver pin description absolute maximum ratings (1) parameter value unit vcc 0.3~20 v gate,pwmo 0.3~20 v en,cs,rt,sync,ref,ovp,pwmi,comp,fbp,fbn 0.3~6.0 v operatingjunctiontemperaturerange 40~150 storagetemperaturerange 65~150 leadtemperature(soldering,10sec) 260 thermalresistance(ja) 110 /w note1 :stressesbeyondthoselistedunderabsolutemaximumra tingsmaycausepermanentdamagetothedevice. thesearestressratingsonly,andfunctionaloperation ofthedeviceattheseoranyotherconditionsbeyond thoseindicatedintheoperationalsectionsofthespecif icationsisnotimplied.exposuretoabsolutemaximum ratingconditionsforextendedperiodsmayaffectdevice reliability. pin no description 1 en enable 2 vcc powersupplyinput 3 gate gatedriveoutputforboostconverter 4 gnd gnd 5 cs currentsenseofboostconverter 6 rt oscillatorsfrequencyset 7 sync oscillatorssynchronizinginput 8 ref referencevoltage 9 pwmo pwmgatedriveroutput 10 ovp overvoltageprotection 11 pwmi pwmgatedriverinput 12 comp erroramp.compensation 13 fbp erroramp.noninvertinginput/positivecurrent sense 14 fbn erroramp.invertinginput/negativecurrentsen se
confidential datasheet version 1.1 march2012 page4 MAP3202 C high efficiency switch mode led driver electrical characteristics v cc =12v,v pwmi =5v,ta=25 ,unlessotherwisespecified symbol parameter test condition min typ max unit supply v cc,op inputvoltagerange ta=40 ~85 8.5 18 v i q operationquiescentcurrent v pwmi =0v 1.2 2 ma v uvlo undervoltagelockoutthreshold 7.5 8 8.5 v undervoltagelockouthysteresis 1 v reference v ref referencepinvoltage ta=40 ~85 4.90 5.00 5.10 v ta=25 4.95 5.00 5.05 v v refli lineregulation i ref =0ua,v pwmi =0v, c ref =0.1uf 0.02 %/v v reflo loadregulation i ref =0~500ua,v pwmi =0v, c ref =0.1uf 1 %/ma gate i source gateshortcircuitcurrent v gate =0,v cc =12v 0.4 a i sink gatesinkcurrent v gate =12v,v cc =12v 0.8 a t rise gateoutputrisetime c gate =1nf,v cc =12v 50 85 ns t fall gateoutputfalltime c gate =1nf,v cc =12v 25 45 ns enable v en enableinputvoltage v en_l :logiclow 0.4 v v en_h :logichigh 2.0 5.5 v current sense t blank leadingedgeblanking 100 375 ns t delay delaytooutputofcscomparator(3) v comp =5v, v cs =0vto600mvstep 180 ns v cs,max maximumcsvoltage fbpCfbn>=0.2v 0.325 0.36 0 .395 v internal transconductance opamp av openloopdcgain outputopen 50 db v cm inputcommonmoderange(3) 0.3 2.2 v v o outputvoltagelowlimit vcc=12v,v fbn Cv fbp >0.2 0.6 v outputvoltagehighlimit vcc=12v,v fbp Cv fbn >0.2 2.6 v gm transconductance(3) 400 670 1000 ua/v
confidential datasheet version 1.1 march2012 page5 MAP3202 C high efficiency switch mode led driver electrical characteristics (continued) v cc =12v,v pwmi =5v,ta=25 ,unlessotherwisespecified symbol parameter test condition min typ max unit internal transconductance opamp i bias inputbiascurrent 0.5 1 na v offset inputoffsetvoltage 5 5 mv i _amp_source ampsourcecurrent v fbn =1v,v fbp =2v,v comp =1.5v 100 ua i _amp_sink ampsinkcurrent v fbn =2v,v fbp =1v,v comp =1.5v 100 ua oscillator f osc oscillatorfrequency (100khz~400khz) ta=40 ~85 ,rt=500 ? 90 100 110 khz ta=25 ,rt=500 ? 95 100 105 khz ta=40 ~85 ,rt=123 ? 340 400 460 khz d max maximumdutycycle 90 % synchronizing ( external input ) v il_sync syncinputvoltagelowlevel 0.8 v v ih_sync syncinputvoltagehighlevel 2 5.5 v t sync_min syncminimuminputpulsewidth(3) v sync =0vto5v 20 ns t sync_max syncmaximuminputpulsewidth v sync =0vto5v 0.05 /fosc ns pwm input v pwmi(lo) pwmiinputlowvoltage ta=40 ~85 0.8 v v pwmi(hi) pwmiinputhighvoltage ta=40 ~85 2.0 5.5 v r pwmi pwmipulldownresistance v pwmi =5v 50 100 150 ? pwm output t rise,pwmo pwmoutputrisetime 1nfcapacitanceatpwmo 300 ns t fall,pwmo pwmoutputfalltime 1nfcapacitanceatpwmo 20 0 ns auto restart protection ( auto ) t ar autorestarttime f osc =100khz 1 ms over voltage protection ( ovp ) v ovp overvoltageprotection 2.94 3.0 3.06 v v ovph overvoltageprotectionhysteresis 0.3 v t ovp ovpfilteringtime(3) 200 ns
confidential datasheet version 1.1 march2012 page6 MAP3202 C high efficiency switch mode led driver electrical characteristics (continued) v cc =12v,v pwmi =5v,ta=25 ,unlessotherwisespecified symbol parameter test condition min typ max unit short current protection ( scp ) v th,scp scpcomparatorthresholdvoltage v fbp =1v(v th,scp =v fbp *2.5) 2.25 2.5 2.75 v t off propagationtimeforshortcurrent detection v fbp =1v, v fbn =2.0to3.0vstep v pwmo goesfromhightolow 250 ns note2 :stressbeyondthemaximumratingslistedabovema yincurpermanentdamagetothedevice.operatinga bovetherecommended conditionsforextendedtimemaystressthedevice andaffectdevicereliability.alsothedevicemay notoperatenormallyabove therecommendedoperatingconditions.thesearestr essratingsonly. note3 :theseparameters,althoughguaranteedbydesign, arenottestedinmassproduction.
confidential datasheet version 1.1 march2012 page7 MAP3202 C high efficiency switch mode led driver typical operating characteristics unlessotherwisenoted,v cc =12v,v pwmi =5v,andt a =25 c. v ref line regulation voltage quiescent current vs. temp quiescent current vs. vcc vref vs. temp under voltage lock out (uvlo) v ref load regulation voltage
confidential datasheet version 1.1 march2012 page8 MAP3202 C high efficiency switch mode led driver over voltage protection.(ovp) frequency vs. rt frequency vs. t emp
confidential datasheet version 1.1 march2012 page9 MAP3202 C high efficiency switch mode led driver application information currentmodeboostswitching regulatoroperation the MAP3202 is operated in current mode pwm boost regulationmethod,whichshowsfastfrequencyrespo nsewhile maintainingstableoutputvoltage. it features stable response by using the recommende d combinationofresistorandcapacitoratcompandg ndpin forspecificconditionofwideinputvoltage,outpu tvoltageand variableloadcondition. internal5vlowdropoutregulator the MAP3202 has ldo embedded in it to supply intern al analog,logiccircuitandexternalrefpin.thisld ooperates atavoltagelevelwherevccishigherthantheuvl ovoltage.it provides maximum 10ma of output current through reg ulator whichhas2%accuracyofperformance. tostabilizethevoltageofrefpin,itisrecommen dedtouse low esr capacitor which is as low as 1uf and connec t it betweenrefandgndpin,andinstallitascloseas topin. boostconverterswitchingfrequency the MAP3202 can set the switching frequency of boos t converter by connecting external resistor between r t and gnd pin. recommended switching frequency is 100 khz to 400khz. seefigure1forswitchingfrequencyadjustmentres istor(rt) figure1boostswitchingfrequencyvs.rt theboostswitchingfrequencycanbedecidedinthe following equation. 50 75 .1 ) ( ) ( + = kohm rt us tosc synchronization the MAP3202s switching frequency can be set by int ernal clock or by external master clock signal through sy nc pin. theclocksignalofsyncpinneedstobefastertha ninternal oscillatorclocktoensurenormalswitchingoperati on. when synchronizing multiple MAP3202 on single board , all sync pin ics of each device should be short to make all devicesinsyncontheoscillatorclockofthefast estdevice. itisrecommendedtouselowesrcapacitorwhichis aslowas 10pfandconnectitbetweensyncandgndpineachd evice, andinstallitascloseastopin. in this case, the number of synchronized devices di ffers dependingontheoperationfrequencyofoscillator. ifthisfunctionofpeertopeersynchronizationis notused,the syncpinmayberequiredtobeopenorshorttognd .itis recommended to connect sync pin to gnd because this solution provides better immunity against parasitic noise from layout. 8 7 7 6 oscillator ref + + ck rt sync figure2internalosc&synccircuit figure3synchronizationbyexternalclock (fixed100khz 300khz) sync(4v/div) boostdrain(100v/div) iboost (0.5a/div) vo(ac1v/div) 300khz/5%` sync(4v/div) boostdrain(100v/div) iboost (0.5a/div) vo(ac1v/div) 300khz/5%`
confidential datasheet version 1.1 march2012 page10 MAP3202 C high efficiency switch mode led driver figure4peertopeersynchronization (fixed100khz) protection the MAP3202 offers the features such as uvlo, boost current limit, over voltage protection and short cu rrent protectionofled(scp).ovpandscpareoperatedi nauto restartprotectionmode. 1.undervoltagelockout(uvlo) when vcc voltage reaches over 8v, uvlo starts opera ting whichenablesinternal5vregulator,makingallint ernalcontrol circuits including oscillator, gate driver and prot ection circuit ready for operation and output pin of gate, pwmo an d compstartsoperatingdependingontheinputstatus ofpwmi. ifvccvoltagedropsbelow7vduringnormaloperati on,uvlo starts operating, shutting down internal control ci rcuit and stoppingoperationofgate,pwmoandcomp.itisfo llowed by disabling of internal 5v regulator, and shut off of all ic operation. 2.maximumboostcurrentlimit MAP3202hastheinternalcurrentlimitthresholdvo ltage,0.36v (typ.). if the sense voltage on cs pin exceeds 0.36 v, MAP3202limitsboostondutyeverypulse. MAP3202s cs circuitry has the leading edge blank t ime at 100ns(min.). 3.overvoltageprotection(ovp) theMAP3202offersovervoltageprotectioninorder toprotect mosfet of boost converter and external component connected to output pin when output voltage is in a bnormal condition. ovpcircuitmonitorswhetheroutputvoltageisstab lelevelor not ifovppinvoltagereachesthresholdcondition(3v typ.),itcan shut off the switching of gate and pwmo and then ou tput voltage is falling as much as the leakage current t ime. if the voltageofovppinreachesovpfallingthreshold(2 .7vtyp.), icreleasesprotectionmode.inthistime,protecti onreleasing canbedecidedasvalueofcapacitorwiththelonge rdischarge between auto restart time and the time of leakage c urrent connectedtooutput. the over voltage protection can be decided in the f ollowing equation. protectionvoltage: 2 2 1 * 3 ro ro ro v out + = protectionreleasevoltage: 2 2 1 * 7.2 ro ro ro v out + = + - 3v / 2.7v 10 vout ca lpf ovp auto restart protection figure5overvoltageprotectioncircuit theMAP3202includedlpf(lowpassfilter)of200ns (typ.)in ovpcircuitforbetternoiseimmunity,itmayneed ahighnoise marginwhenro1andro2usehighresistancevaluei norder tominimizepowerloss. thetotalvaluesofro1andro2needtobelowerth an1mohm. inthiscase,itisrecommendedtoaddcapacitor. 4.shortcurrentprotectionofled(scp) theMAP3202offersprotectioncircuittopreventsh ortcurrent whenledstringisshorted infigure6whenledstringisshorted,thevoltage offbnpin canbecalculatedinthefollowingequation led led fbn r i v ? = if the voltage of fbn pin exceeds the voltage of fb p x 2.5, MAP3202goesintoscpmode. itisrecommendedwhichfbpmaxvoltage1.5v. figure6shortcurrentprotections gate1 gate2 gate3 ch2boostdrain ch1boostdrain gate1 gate2 gate3 ch2boostdrain ch1boostdrain
confidential datasheet version 1.1 march2012 page11 MAP3202 C high efficiency switch mode led driver scp circuit uses very fast comparator in order to t urn off mosfet when the abnormal condition of scp level is detected.becausehighcurrentcanbedrivenintoc hannelof mosfetwhenledstringisshorted. 5.autorestartprotection theMAP3202offersautorestartprotectionfunction whichis recovered into normal operation mode when protectio n conditioniscleared.theautorestarttime(t ar )isfixedat1ms, fosc = 100khz. it is recovered to normal operating mode if scporovpconditioniscleared. dimmingcontrol 1.ledcurrent the MAP3202 decides led current setting by the valu e of rledresistanceandvoltageonfbppinasbelow rled fbp v current led _ _ = figure7ledcurrentsetting 2.pwmdimming the MAP3202 makes same phase pwmo output from logic pwm signal of pwmi using internal level shift. pwmo of operatingvoltagelevelisbetweengndandvcc. inductorselection inductorvalueshouldbedecidedbeforesystemdesi gn. becausetheselectionoftheinductoraffectstheoperat ing mode of ccm (continuous current mode) or dcm (discontinuouscurrentmode),inccmoperation,ind uctorsize should be bigger, even though the ripple current an d peak currentofinductorcanbesmall. in dcm operation, even ripple current and peak curr ent of inductorshouldbelargewhiletheinductorsizeca nbesmaller so that it is more effective in blu of tv and noteb ook application. theMAP3202wasdesignedfordcmoperation. inccmoperation,subharmonicoscillationmayoccu rifduty cycle exceeds over 50%. because there is no slope compensationfunctions. thefollowingistheequationtocalculatemaxvalu eofinductor indcmoperation. 2 ] * * * ) 1 [( (min) (max) 2 (max) s o t r d d l ? = where, r 0(max) =maximumoutputimpedance t s(min) =minimumswitchingperiod closedloopnetworkselection the MAP3202 controls in peak current mode. current mode easilyachievescompensationbyconsistingsimples inglepole fromdoublepolethatlcfilermakesatvoltagemod e figure8currentmodeloopcompensation 1.selectf c (crossoverfrequency) in general, crossover frequency is selected from 1/ 3 ~ 1/6 range of the switching frequency. if fc is large, t here is possibility of oscillation to occur, although time response gets better. on the other hand, if fc is small, time response wi ll be bad, whileithasimprovedstability,whichmaycauseov ershootor undershootinabnormalcondition. itshouldbenotedthatfcshouldbesetatsmaller locationthan rhpzero. l d ro f rhp * 2 ) 1(* 2 ? = 2.selectf po o c po g f f * = ( dc g o = gainofplant= b a ) + vc ~ i l ~ vc vref co ro vout + - rc cc (optional)
confidential datasheet version 1.1 march2012 page12 MAP3202 C high efficiency switch mode led driver f l d m r a * ) 1(*)5.0 ( 2 1 3 ? ? + = selectingapproximatelym=1.4 ) 1(* d r b s ? = = s r sensingresistor 3.selectpoleandzero ea c po g y c f * * 2 1 = = ea g gmamptransconductance o fpn v v ratio n attenuatio y = ? = c c z c r f * * 2 1 1 = zeroissetatthesamelocationofoutputpolein systemdesign, ifesrofoutputcapacitorislarge,poleshouldbe setatsame frequencyinordertocompensatethezeroofesr. op c op p c r f * * 2 1 ) (1 =
confidential datasheet version 1.1 march2012 page13 MAP3202 C high efficiency switch mode led driver evaluation board schematic condition : vin=120v, vout = 63leds, led current = 125ma, ovp set = 303v, release = 272v, sw frequency =100khz c2 c5 c7 c3 q1 q2 l1 c1 c8 c10 c4 c9 2 12 6 13 8 1 4 14 7 11 10 5 3 9 vin ref en signal vcc gnd q1-d led+ gate ovp pwmo gate2 gnd fbn gnd gate1 cs1 cs2 d3 d2 d1 fbn1 led- fbp led+ led- gnd gnd c11 evaluation board part list spec vendor p/n inputcapacitor 10uf/400v samwha 1 rd10uf/400v outputcapacitor 10uf/400v samwha 1 rd10uf/400v inductor 330uh abco 2 lpf1280331 boostmosfet 3a/400v,nch,sot223 magnachip mdht3n40 dimmingmosfet 3a/400v,nch,sot223 magnachip mdht3n40 ultrafastdiode 1a/1000v vishay uf4007 ic pwmcontroller magnachip MAP3202 1. samwha: 1) electrolyticcapacitor,samwhaelectrictel:+8 2432610200, http://www.samwha.co.kr/electric 2) mlcccapacitor,samwhacapacitortel:+823133 05872, http://www.samwha.co.kr/capacitor 2. abcotel:+82317305000, http://www.abco.co.kr
confidential datasheet version 1.0 march2012 page14 MAP3202 C high efficiency switch mode led driver physical dimensions 14lead soic magnachip semiconductor ltd. doesntnotrecommendtheuseofitsproductsinh ostileenvironments,including,withoutlimitation, aircraft,nuclearpowergeneration,medicalapplian ces,anddevicesorsystemsinwhichmalfunctionof anyproductcanreasonably beexpectedtoresultinapersonalinjury.seller scustomersusingorsellingsellersproductsfor useinsuchapplicationsdosoat theirownriskandagreetofullydefendandindemn ifyseller. magnachip reserves the right to change the specifications an dcircuitry without notice at any time. magnachip does not consider responsibilityforuseofanycircuitryotherthan circuitryentirelyincludedina magnachip product. isaregisteredtrademarkofmagnachipsemiconducto rltd. magnachip semiconductor ltd. 891,daechidong,kangnamgu,seoul,135738korea tel:82269033451/fax:82269033668~9 www.magnachip.com
confidential datasheet version 1.0 march2012 page15 MAP3202 C high efficiency switch mode led driver revision history date version changes 20100318 version1.0 initialrelease. 20120315 version1.1 changedabsolutemaximumrat ings5.0vto6.0v

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