FairchildFAN5069高效电源控制方案

FairchildFAN5069高效电源控制方案关键词：电源管理,DC/DC转换器,FAN5069Fairchild公司的FAN5069是高效PWM控制器和LDO线性稳压器控制器,同步整流为大范围的负载提供了高效率.输入电压从3V到24V,输出电压范围从0.8V到15V.可编程的开关频率从200KHz到600KHz.FAN5069主要应用在PC/服务器主板外设,FPGA,DSP,嵌入式控制器等电源,工业电源以及大功率DC/DC转换器.本文介绍了FAN5069的主要特性,方框图,典型应用电路图以及应用板电路图和应用板材料清单.TheFAN5069combinesahigh-efficiencyPulse-Width-Modulated(PWM)controllerandanLDO(LowDropOut)linearregulatorcontroller.Synchronousrectificationprovideshighefficiencyoverawiderangeofloadcurrents.Efficiencyisfurtherenhancedbyusingthelow-sideMOSFET’sRDS(ON)tosensecurrent.BoththelinearandPWMregulatorsoft-startarecontrolledbyasingleexternalcapacitor,tolimitin-rushcurrentfromthesupplywhentheregulatorsarefirstenabled.CurrentlimitforPWMisalsoprogrammable.ThePWMregulatoremploysasumming-current-modecontrolwithexternalcompensationtoachievefastloadtransientresponseandprovidedesignoptimization.FAN5069isofferedinbothindustrialtemperaturegrade(-40°Cto+85°C)aswellascommercialtemperaturegrade(-10°Cto+85°C).FAN5069主要特性:■GeneralPurposePWMRegulatorandLDOController■InputVoltageRange:3Vto24V■OutputVoltageRange:0.8Vto15V–VCC–5V■ShuntRegulatorfor12VOperation■SupportforCeramicCaponPWMOutput■ProgrammableCurrentLimitforPWMOutput■ProgrammableSwitchingFrequency(200KHzto600KHz)■RDS(ON)CurrentSensing■InternalSynchronousBootDiode■Soft-StartforbothPWMandLDO■Multi-FaultProtectionwithOptionalAuto-restart■16-pinTSSOPPackageFAN5069应用:■PC/ServerMotherboardPeripheralsVCC_MCH(1.5V),VDDQ(1.5V)andVTT_GTL(1.25V)■PowerSupplyforFPGA,DSP,EmbeddedControllers,GraphicCardProcessor,andCommunicationProcessors■IndustrialPowerSupplies■High-PowerDC-to-DCConverters图1.FAN5069方框图图2.FAN5069典型应用电路图AO-Electronics傲壹电子官网：中文网：应用板电路图应用板材料清单(BOM):