XL1513规格书(官方版).pdf

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1、2A380KHz18VBuckDCtoDCConverterXL1513FeaturesGeneralDescription¢Wide3.6Vto18VInputVoltageRangeTheXL1513isa380KHzfixedfrequency¢OutputAdjustablefrom0.8Vto16VPWMbuck(step-down)DC/DCconverter,¢MaximumDutyCycle100%capableofdrivinga2Aloadwithhigh¢MinimumDropOut0.6Vefficiency,lowrippleande

2、xcellentlineand¢Fixed380KHzSwitchingFrequencyloadregulation.Requiringaminimum¢2AConstantOutputCurrentCapabilitynumberofexternalcomponents,theregulator¢InternalOptimizePowerMOSFETissimpletouseandincludeinternal¢Highefficiencyfrequencycompensationanda¢Excellentlineandloadregulationfix

3、ed-frequencyoscillator.¢TTLshutdowncapability¢ENpinwithhysteresisfunctionThePWMcontrolcircuitisabletoadjustthe¢Builtinthermalshutdownfunctiondutyratiolinearlyfrom0to100%.Anenable¢Builtincurrentlimitfunctionfunction,anovercurrentprotectionfunction¢Builtinoutputshortprotectionfunction

4、isbuiltinside.Whenshortprotectionfunction¢AvailableinSOP8packagehappens,theoperationfrequencywillbereducedfrom380KHzto80KHz.AninternalcompensationblockisbuiltintominimizeApplicationsexternalcomponentcount.¢LCDMonitorandLCDTV¢DigitalPhotoFrame¢Set-upBox¢ADSLModem¢Telecom/NetworkingEq

5、uipmentFigure1.PackageTypeofXL151312A380KHz18VBuckDCtoDCConverterXL1513PinConfigurationsFB18GNDEN27GNDXL1513NC36SWVIN4S5WFigure2.PinConfigurationofXL1513(TopView)Table1PinDescriptionPinNumberPinNameDescription3NCNoConnected.SupplyVoltageInputPin.XL1513operatesfroma3.6Vto18V4VINDCvol

6、tage.BypassVintoGNDwithasuitablylargecapacitortoeliminatenoiseontheinput.PowerSwitchOutputPin(SW).Outputistheswitchnodethat5,6SWsuppliespowertotheoutput.GroundPin.Caremustbetakeninlayout.ThispinshouldbeplacedoutsideoftheSchottkyDiodetooutputcapacitorground7,8GNDpathtopreventswitchin

7、gcurrentspikesfrominducingvoltagenoiseintoXL1513.FeedbackPin(FB).Throughanexternalresistordivider1FBnetwork,Feedbacksensestheoutputvoltageandregulatesit.Thefeedbackthresholdvoltageis0.8V.EnablePin.DriveENpinlowtoturnoffthedevice,driveit2ENhightoturniton.Floatingisdefaulthigh.22A380K

8、Hz18VBuckDCtoDCConv