TIDA-01579高效低波纹输出电源参考设计【钜大锂电】

TI公司的TIDA-01579是采用TpS6282x系列等的高效低波纹输出电源参考设计，采用DCS-Control™拓拓，输出电流高达3A（TpS62823），26/25mΩ内部功率开关，非常低的静态电流4μA，典型开关频率2.2MHz，可调输出电压从0.6V到4V，1%反馈电压精度，100%占空比，内部有软起动电路，主要用在手持/电池供电设备的pOL电源，工厂和建筑物自动化，移动计算和网络卡，固态驱动，数据终端和pOL.本文介绍了参考设计TIDA-01579主要特性和指标，框图，电路图，材料清单和pCB设计图。

TheTpS6282xisanall-purposeandeasytousesynchronousstep-downDC-DCconverterwithaverylowquiescentcurrentofonly4μA.Itsuppliesupto3Aoutputcurrent（TpS62823）froma2.4Vto5.5Vinputvoltage.BasedontheDCS-Control™topologyitprovidesafasttransientresponse.

Theinternalreferenceallowstoregulatetheoutputvoltagedownto0.6Vwithahighfeedbackvoltageaccuracyof1%overthejuncTIontemperaturerangeof-40℃to125℃。The1，2，3Ascalablepin-to-pinandBOM-to-BOMcompaTIbledevicefamilycanbeusedwithsmall470nHinductors.

TheTpS6282xincludeanautomaticallyenteredpowersavemodetomaintainhighefficiencydowntoverylightloads.

ThedevicefeaturesapowerGoodsignalandaninternalsoftstartcircuit.Itisabletooperatein100%mode.Forfaultprotection，itincorporatesaHICCUpcurrentlimitaswellasathermalshutdown.

TheTpS6282xarepackagedina2x1.5mmQFN-8package.

参考设计TIDA-01579主要特性：

•DCS-Control™topology

•26/25mΩInternalpowerSwitches（TpS62823）

•Upto3AOutputCurrent（TpS62823）

•VeryLowQuiescentCurrentof4μA

•SwitchingFrequencyoftypically2.2MHz

•1%FeedbackVoltageAccuracy（fulltemp.range）

•Enable（EN）andpowerGood（pG）

•AdjustableOutputVoltagefrom0.6Vto4V

•100%Duty-CycleMode

•InternalSoft-StartCircuitry

•SeamlesspowerSaveModeTransition

•UndervoltageLockout

•ActiveOutputDischarge

•Cycle-by-CycleCurrentLimit

•HICCUpShort-Circuitprotection

•OverTemperatureprotection

•CreateaCustomDesignusingtheTpS62822withtheWEBENCH®powerDesigner

参考设计TIDA-01579应用：

•pOLsupplyinportable/BatterypoweredDevices

•FactoryandBuildingAutomation

•MobileComputing，NetworkingCards

•SolidStateDrive

•DataTerminal，pointofSale

•Servers，projectors，printers

图1.参考设计TIDA-01579框图

图2.TpS62822应用电路：2.4V-5.5V2A电源

Thepoint-of-loadpower-treeonvideosurveillancesystemsisoptimizedwiththisreferencedesign.Thisreferencedesignhasahighperformanceonkeyparameterssuchasoutputvoltageaccuracy，voltageripple，andthermaldissipation.ThishighperformanceispossiblewithasmallboardareaandlowBOMcost.

Thedesignoperatesfroma5-Vsupplycommonlyfoundinvideodoorbells，Ipnetworkcameras，andwirelesscameras.

Videodoorbellsprovideasetoffeaturescommontomanytraditionalvideosurveillancedevices.Thisdistinguishingfeaturedemandsauniquepowerdesigntoensuretrouble-freeoperationfromtheubiquitous，butwidely-varying，ACdoorbellsupply.TofullyutilizeanACsourcethatpresentsasubstantialbottleneck，thepowerdesignshouldbeasefficientaspossible.ThisdesignusesTI’snewsynchronousbuckconvertersandLDOsprovidingacompleteandcustomizablesupplyoptimizedforvideodoorbells.

OurnewestconvertersinQFNandSOT-563packagesallowforasupplydesignthatrequiresminimalboardspaceandhasalowthermalimpact—bothofwhichareneededforsmallerformfactorelectronics.Forbettercompatibility，sequencingispossibleforallrails.

Ipnetworkcamerashaveincreasingimageresolution，processing，andilluminationrequirementswhilestillfittinginsmallenclosures.Aftersteppingdownfromamid-tohigh-voltageDCpowersourcesuchaspluginpowerorpoE，thesystemdemandspoint-of-loadconversionwithhighefficiencyandasmallfootprint.

Bothefficiencyandfootprintareimportanttoaccommodatesmallenclosureswith，typically，less-thanadequateventilation.Thisdesignisoptimizedforbothefficiencyandfootprintwhilealsoprovidingtheflexibilitytotailortomoreadvanced，power-demandingloads，suchasadedicatedimagerecognitionprocessoror4Kvideoprocessor.

Wirelessorbattery-poweredcamerasrequirehighefficiencyatbothfullloadsandlightloads.Thesecamerastypicallyemploymotiondetection，humaninterface，orwirelesscommunicationsmonitoring，oranycombinationofthethree，tominimizetimespentinpower-hungrystatesquiescentcurrentsandshutdowncurrentsofsubsystemsareveryimportantasthesestandbycurrentscanhavesignificantimpactonoverallbatterylife.TheTIDA-01579referencedesignhasbeenoptimizedforthisapplicationbyutilizingTI’slow-powerconvertersfeaturingbothlightloadefficiencyandshutdownwithlowIq.Convertershutdownandlow-Iqloadswitchescanbeusedtocutpowertosubsystemswithless-than-desirablestandbyconsumption—savingcostandextendingbatterylife.

参考设计TIDA-01579主要特性：

•1%Typicaloutputvoltageaccuracy

•Highsystemefficiencyto90%atfullload

•Voltageripple《60-μV，usefulfornoise-criticalperipherals

•Thermalhotspotis《45℃atfullloadcurrent

•SmallpCBrealestate

•LowBOMcost

参考设计TIDA-01579应用：

•VideoDoorbell

•IpNetworkCamera

•Wirelesscamera

•ThermalImagingCamera