负-负开关转换器提供大电流和高效率

摘要：外部运放（MAX4322），使此开关升压转换器（MAX668）提供输出电流高达4A效率比90%。运算放大器使对地规管电路（而不是-5.2V电源电压输入），从而避免输入的变化的影响上-3.6v输出。Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP4834Maxim>Designsupport>Appnotes>Power-SupplyCircuits>APP4834Keywords:negative-to-negativesupply,switch-modeconverter,switch-modeboostconverter,opampFeb02,2011APPLICATIONNOTE4834Negative-to-NegativeSwitch-ModeConverterOffersHighCurrentandHighEfficiencyBy:BudgeIngAbstract:Anexternalopamp(MAX4322)enablesthisswitch-modeboostconverter(MAX668)todeliveroutputcurrentsashighas4Awithefficienciesbetterthan90%.Theopampenablesthecircuittoregulatewithrespecttoground(insteadofthe-5.2Vsupply-voltageinput),therebyavoidingt