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TS51221-M025QFNR Datasheet(PDF) 8 Page - Semtech Corporation |
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TS51221-M025QFNR Datasheet(HTML) 8 Page - Semtech Corporation |
8 / 18 page TS51221 Final Datasheet Rev 1.1 April 6, 2015 www.semtech.com 8 of 18 Semtech VCC Under-Voltage Lockout ThedeviceisheldintheoffstateuntilVCCreaches4.5V (typical).Thereisa500mVhysteresisonthisinput,which requirestheinputtofallbelow4.0V(typical)beforethedevice willdisable. Internal Protection Details Internal Current Limit ThecurrentthroughthehighsideFETissensedonacycle bycyclebasisandifcurrentlimitisreached,itwillabbreviate thecycle.Inaddition,thedevicesensestheFBpintoidentify hardshortconditionsandwilldirecttheVSWoutputtoskip4 cyclesifcurrentlimitoccurswhenFBislow.Thisallowscurrent builtupintheinductorduringtheminimumontimetodecay sufficiently.Currentlimitisalwaysactivewhentheregulator isenabled.Softstartensurescurrentlimitdoesnotprevent regulatorstartup. Underextendedovercurrentconditions(suchasashort), thedevicewillautomaticallydisable.Oncetheovercurrent conditionisremoved,thedevicereturnstonormaloperation automatically.(Alternatelythefactorycanconfigurethe device’sNVMtoshutdowntheregulatorifanextendedover currenteventisdetectedandrequireatoggleoftheEnable pintoreturnthedevicetonormaloperation.) Thermal Shutdown Ifthetemperatureofthedieexceeds170°C(typical),theVSW outputswilltri-statetoprotectthedevicefromdamage.The PGandallotherprotectioncircuitrywillstayactivetoinform thesystemofthefailuremode.Oncethedevicecoolsto160°C (typical),thedevicewillstartupagain,followingthenormal softstartsequence.Ifthedevicereaches170°C,theshutdown/ restartsequencewillrepeat. Reference Soft Start Thereferenceinthisdeviceisrampedatarateof4msto preventtheoutputfromovershootduringstartup.Thisramp restartswheneverthereisarisingedgesensedontheEnable pin.Thisoccursinboththefixedandadjustableversions. Duringthesoftstartramp,currentlimitisstillactive,andwill stillprotectthedeviceincaseofashortontheoutput. Output Overvoltage Iftheoutputoftheregulatorexceeds103%oftheregulation voltage,theVSWoutputswilltri-statetoprotectthedevice fromdamage.Thischeckoccursatthestartofeachswitching cycle.Ifitoccursduringthemiddleofacycle,theswitching forthatcyclewillcomplete,andtheVSWoutputswilltri-state atthebeginningofthenextcycle. |
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