CX1410 集成电路DCDC降压芯片车充方案.pdf

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1、深圳市尚亿微科技有限公司T:135(*)4426(*)35322A380KHz18VBuckDCtoDCConverterQ:2247(*)114050CX1410FeaturesGeneralDescription¢Wide3.6Vto18VInputVoltageRangeTheXL1410isa380KHzfixedfrequency¢OutputAdjustablefrom1.222Vto16VPWMbuck(step-down)DC/DCconverter,¢MaximumDutyCycle100%capableofdrivinga2Aloadwithhigh¢MinimumDrop

2、Out0.6Vefficiency,lowrippleandexcellentlineand¢Fixed380KHzSwitchingFrequencyloadregulation.Requiringaminimum¢2AConstantOutputCurrentCapabilitynumberofexternalcomponents,theregulator¢InternalOptimizePowerMOSFETissimpletouseandincludeinternal¢Highefficiencyfrequencycompensationanda¢Excellentlineandloa

3、dregulationfixed-frequencyoscillator.¢TTLshutdowncapability¢ENpinwithhysteresisfunctionThePWMcontrolcircuitisabletoadjustthe¢Builtinthermalshutdownfunctiondutyratiolinearlyfrom0to100%.Anenable¢Builtincurrentlimitfunctionfunction,anovercurrentprotectionfunction¢Builtinoutputshortprotectionfunctionisb

4、uiltinside.Whenshortprotectionfunction¢AvailableinSOP8packagehappens,theoperationfrequencywillbereducedfrom380KHzto80KHz.AninternalcompensationblockisbuiltintominimizeApplicationsexternalcomponentcount.¢LCDMonitorandLCDTV¢DigitalPhotoFrame¢Set-upBox¢ADSLModem¢Telecom/NetworkingEquipmentFigure1.Packa

5、geTypeofXL14101深圳市尚亿微科技有限公司2A380KHz18VBuckDCtoDCConverterCX1410PinConfigurationsNC18NCVIN27ENCX1410SW36NCGND4F5BFigure2.PinConfigurationofXL1410(TopView)PinNumberPinNameDescription1,6,8NCNoConnected.SupplyVoltageInputPin.XL1410operatesfroma3.6Vto18V2VINDCvoltage.BypassVintoGNDwithasuitablylargecapac

6、itortoeliminatenoiseontheinput.PowerSwitchOutputPin(SW).Outputistheswitchnodethat3SWsuppliespowertotheoutput.GroundPin.Caremustbetakeninlayout.ThispinshouldbeplacedoutsideoftheSchottkyDiodetooutputcapacitorground4GNDpathtopreventswitchingcurrentspikesfrominducingvoltagenoiseintoXL1410.FeedbackPin(FB

7、).Throughanexternalresistordivider5FBnetwork,Feedbacksensestheoutputvoltageandregulatesit.Thefeedbackthresholdvoltageis1.222V.EnablePin.DriveENpinlowtoturnoffthedevice,driveit7ENhightoturniton.Floatin