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ID:22583493
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页数:7页
时间:2018-10-30
《maximmax17498a峰值电流模式电源转换方案》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、MaximMAX17498A峰值电流模式电源转换方案关键词:电源管理,AC/DC转换器,DC/DC转换器Maxim公司的MAX17498A/B/C是用于反激/升压电源的峰值电流模式AC/DC和DC/DC电源转换器,包括丫设计宽输入电压隔离和非隔离电源的所有控制电路,MAX17498A/MAX17498C反激转换器的工作频率250kHz,MAX17498巳反激/升压转换器的工作频率500kHz,具有极好的瞬态响应特性,主要用在工业应用的前端AC/DC电源,通信电源等。木文介绍了MAX17498A/MAX17498B/MAX17498C主要特性和优势,方框图和多种起动电路,以及智能电表和PLC电
2、源的应用案例。TheMAX17498A/MAX17498B/MAX17498Cdevicesarecurrent-modefixed-frequencyflyback/boostconverterswithaminimumnumberofexternalcomponents.Theycontainallthecontrolcircuitryrequiredtodesignwide-input-voltageisolatedandnonisolatedpowersupplies.TheMAX17498Ahasitsrising/fallingundervoltagelockout(UVLO)t
3、hresholdsoptimizedforuniversaloffline(85VACto265VAC)applications,whiletheMAX17498B/MAX17498CsupportUVLOthresholdssuitabletolow-voltageDC-DCapplications.TheswitchingfrequencyoftheMAX17498A/MAX17498Cflybackconvertersis250kHz,whilethatoftheMAX17498Bflyback/boostconverteris500kHz.Thesefrequenciesallowt
4、heuseoftinymagneticandfiltercomponents,resultingincompact,cost-effectivepowersupplies.AnEN/UVLOinputallowstheusertostartthepowersupplypreciselyatthedesiredinputvoltage,whilealsofunctioningasanon/offpin.TheOVIpinenablesimplementationofaninputovervoltage-protectionschemethatensuresthattheconvertershu
5、tsdownwhentheDCinputvoltageexceedsthedesiredmaximumvalue.Thedevicesincorporateaflexibleerroramplifierandanaccuratereferencevoltage(REF)toenabletheendusertoregulatebothpositiveandnegativeoutputs.ProgrammablecurrentlimitallowspropersizingandprotectionoftheprimaryswitchingFET.TheMAX17498Bsupportsamaxi
6、mumdutycycleof92%andprovidesprogrammableslopecompensationtoallowoptimizationofcontrol-loopperformance.TheMAX17498A/MAX17498Csupportamaximumdutycycleof49%,andhavefixedinternalslopecompensationforoptimumcontrol-loopperformance.Thedevicesprovideanopen-drainPGOODpinthatservesasapower-goodindicatoranden
7、tersthehigh-impedancestatetoindicatethattheflyback/boostconverterisinregulation.AnSSpinallowsprogrammablesoft-starttimefortheflyback/boostconverter.Hiccup-modeovercurrentprotectionandthermalshutdownareprovi
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