TIDA-01579高效低波紋輸出電源參考設(shè)計

鉅大LARGE | 點擊量：1191次 | 2020年02月05日

TI公司的TIDA-01579是采用TpS6282x系列等的高效低波紋輸出電源參考設(shè)計，采用DCS-Control?拓拓，輸出電流高達3A（TpS62823），26/25mΩ內(nèi)部功率開關(guān)，非常低的靜態(tài)電流4μA，典型開關(guān)頻率2.2MHz，可調(diào)輸出電壓從0.6V到4V，1%反饋電壓精度，100%占空比，內(nèi)部有軟起動電路，主要用在手持/電池供電設(shè)備的pOL電源，工廠和建筑物自動化，移動計算和網(wǎng)絡(luò)卡，固態(tài)驅(qū)動，數(shù)據(jù)終端和pOL.本文介紹了參考設(shè)計TIDA-01579主要特性和指標(biāo)，框圖，電路圖，材料清單和pCB設(shè)計圖。

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.

參考設(shè)計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

參考設(shè)計TIDA-01579應(yīng)用：

?pOLsupplyinportable/BatterypoweredDevices

?FactoryandBuildingAutomation

?MobileComputing，NetworkingCards

?SolidStateDrive

?DataTerminal，pointofSale

?Servers，projectors，printers

圖1.參考設(shè)計TIDA-01579框圖

圖2.TpS62822應(yīng)用電路：2.4V-5.5V2A電源

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.

參考設(shè)計TIDA-01579主要特性：

?1%Typicaloutputvoltageaccuracy

?Highsystemefficiencyto90%atfullload

?Voltageripple《60-μV，usefulfornoise-criticalperipherals

?Thermalhotspotis《45℃atfullloadcurrent

?SmallpCBrealestate

?LowBOMcost

參考設(shè)計TIDA-01579應(yīng)用：

?VideoDoorbell

?IpNetworkCamera

?Wirelesscamera

?ThermalImagingCamera