TS51221-M015QFNR datasheet(8/18 Pages) SEMTECH

tên linh kiện	TS51221-M015QFNR

Giải thích chi tiết về linh kiện	High Efficiency Regulator IC for Wireless Power Receiver Applications

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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.

Số phần tương tự - TS51221-M015QFNR

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