标签: automove

每个背板流行multisupply巴士（如VME，VXI和PCI）提供电源有限的输出3.3V，5V，±12V（±24V）。如果这些系统线卡增加3.3V或5V电源的要求，功率预算，从而可以支配的电路利用其从负载较轻的-12V源的功率。Maxim>AppNotes>AUTOMOTIVEPOWER-SUPPLYCIRCUITSKeywords:3.3VSupplyTapsPowerfromthe-12VPCIBusFeb07,2000APPLICATIONNOTE2963.3VSupplyTapsPowerfromthe-12VPCIBusAdditionalInformation:qQuickViewDataSheetfortheMAX668qSamplesandLiteratureOrderFormqTechnicalSupport:PowerThebackplanesofpopularmultisupplybuses(suchasVME,VXI,andPCI)eachprovidepower-limitedoutputsof3.3V,5V,and±12V(or±24V).Ifaddinglinecardstothesesystemsincreasestherequirementsfor3.3Vor5Vpower,thepowerbudgetthuscandictatethatacircuittapitspowerfromthelightlyloaded-12Vsource.Thefigurebelowshowsacircuitthatderives3.3Vfrom-12Vbyboostingthe-12Vs……

上述电路产生-30V，+5V输入效率83％电源SLIC的集成电路在80毫安。基于MAX668变压器反激应用上，该电路采用自定义生成-30V的变压器。一个500kHz的开关频率允许使用陶瓷输出电容器。加入三分之一的陶瓷输出电容，输出电流可以增加至120mA。Maxim>AppNotes>AUTOMOTIVEPOWER-SUPPLYCIRCUITSKeywords:5VInputConverterGenerates-30Vat80mANov01,2000APPLICATIONNOTE4335VInputConverterGenerates-30Vat80mAAdditionalInformation:qQuickViewDataSheetfortheMAX668qQuickViewDataSheetfortheMAX4130qTechnicalSupport:PowerThiscircuitusestheMAX668andatransformer(whichwillneedaboutaone-to-sixturnsratio)tomakeaflybackconverter.Theopampinvertsthefeedbackfromthenegativeoutputvoltage.Thecircuitabovegenerates-30Vat80mAfroma+5Vinputwith83%efficiencytopowerSLICintegratedcircuits.BasedonaMAX668transformerflybackapplication,thecircuitemploysacustomtransformertogenerate-3……