1.OverviewTheOL7272isanindustrialpowerlinedriverandcontainsfouridenticalshortcircuitproofdifferentiallinedriversupto30Voltsdriversupplywithajointenablefunction.Atoverloadthereisathermalshutdownfeaturewhichcanbedisabledbytheuser.Thehighdatarateandimmunitytocableinductanceandcapacitancemakesanideallinedriver.TheverysmalloutlineSOPpackagegivesexcellentthermalpowerdissipation,thustheusageinspacelimitedapplicationsiseasy.2.ApplicationsOL7272-Industrial30Volt4ChannelDifferentialPowerLineDriver？Industrialencoderinterfacing？Industrialsensorinterfacing？Proximityswitches？IndustrialcontrollersPLC？Lightbarriers3.Features？Max.voltagerangefrom4.5Vto36V？Shortcircuitprooftri-stateoutputsdriveupto120mAsink/source？Operatingfrequencyupto4MHz？PincompatiblewithET7272？Dynamicpeakcurrentupto1.5A？HighimpedanceCMOS/TTLcompatiblebufferedinputswithhysteresis？OutputsRS422Acompatible？UltrasmallpackageTSSOP(OL2068)available？RoHSconformIMPLYPRECISE4.FunctionaldescriptionThemaincontentsofthisnewCMOSpowerlinedriverarefouridenticalblocks(systemsAtoD)witheachaCMOS/TTLSchmittTriggerInput(canbedrivenatuptoVCCDaswell)andhighpowerdifferentialbufferedandinvertedoutputs.WiththelowactiveENABLEpinitispossibletoswitchoffalleightoutputs(high-impedancestate),thusthisdrivercanbeusedinindustrialbussystems.Insomerareapplicationsitmightbeusefultodisabletheovertemperatureshutdown.ThiscanbedonebysettingtheENABLEpintoalevelbetween>7,5Vand<12V.InthiscasethewholeprotectionoftheICisdisabled!Incaseofanyshortcircuitsorthermaloverdrive,thedrivermightbedestroyed!Aninternalultralowdropvoltageregulatorwithtypical5.0Vsuppliestheinternallogictoreducepowerdissipation.Theover-temperatureprotectionblockisplacedinthecenterofthechip.Thethermalshutdownwillbeactivated,whenanoverloadcondition(i.e.shortcircuit)hasexceededtheover-temperaturedetectionthreshold.Inthiscaseautomaticallyalloutputdriversareswitchedoff.Afterthechiphascooleddown(afewmilliseconds)itautomaticallyre-activatesallfunctions.更多产品信息，请联系苏州光电科技有限公司！