ADIADuM347x四路带PWM控制和变压器驱动数字隔离方案

ADIADuM347x四路带PWM控制和变压器驱动数字隔离方案关键字：工业控制,过程控制,传感器ADI公司的ADuM347x是四路带PWM控制和变压器驱动数字隔离器，采用ADI的iCoupler技术，器件的DC/DC转换器提供高达2W的输出，5.0V或3.3V输入输出电压从3.3V到24V,200kHz到1MHz可调频率，主要用在RS-232/RS-422/RS-485收发器，工业现存总线隔离，绝缘传感器接口和过程控制等．本文介绍了ADuM347x主要特性，功能方框图，I/O通路框图以及单电源与正和不稳压负电源的应用电路图，所用变压器参考设计．TheADuM347xdevicesarequad-channel,digitalisolatorswithanintegratedPWMcontrollerandtransformerdriverforanisolateddc-to-dcconverter.BasedontheAnalogDevices,Inc.,iCouplertechnology,thedc-to-dcconverterprovidesupto2Wofregulated,isolatedpowerat3.3Vto24Vfroma5.0Vinputsupplyorfroma3.3Vsupply.Thiseliminatestheneedforaseparate,isolateddc-to-dcconverterin2Wisolateddesigns.TheiCouplerchip-scaletransformertechnologyisusedtoisolatethelogicsignals,andtheintegratedtransformerdriverwithisolatedsecondarysidecontrolprovideshigherefficiencyfortheisolateddc-to-dcconverter.Theresultisasmallformfactor,totalisolationsolution.TheADuM347xisolatorsprovidefourindependentisolationchannelsinavarietyofchannelconfigurationsanddatarates.ADuM347x主要特性：IsolatedPWMControllerIntegratedtransformerdriverRegulatedadjustableoutput:3.3Vto24V2Woutputpower70%efficiencyatguaranteedloadof400mAat5.0VoutputQuaddc-to-25Mbps(NRZ)signalisolationchannels20-leadSSOPpackageHightemperatureoperation:105℃Highcommon-modetransientimmunity:25kV/μs200kHzto1MHzadjustableoscillatorfrequencySoftstartfunctionatpower-upPulse-by-pulseovercurrentprotectionThermalshutdown2500VrmsisolationADuM347x应用：RS-232/RS-422/RS-485transceiversIndustrialfieldbusisolationPowersupplystartupbiasandgatedrivesIsolatedsensorinterfacesAO-Electronics傲壹电子官网：中文网：图１．ADuM347x功能方框图图２．ADuM347xI/O通路框图图３．ADuM347x单电源应用电路图图４．ADuM347x正和不稳压负电源应用电路图变压器参考设计