摘要：65Vhysteretically控制LED驱动程序(MAX16822A)有它的地面引脚连接到-48V和输入其电源连接到系统的地面。调光，电路的逻辑级别的控制信号（控制）是水平转移到-48V，并应用于太暗输入，使用80V/500mA高电压PNP晶体管（CMPT5551）。
Maxim>AppNotes>DisplaydriversLEDlightingKeywords:LEDdrivers,LEDdimming,-48Vtelecomsystems,high-VPNPtransistorsOct13,2009APPLICATIONNOTE4619Logic-LevelSignalsDim-48VLEDDriverBy:AhmadAyarAbstract:A65VhystereticallycontrolledLEDdriver(MAX16822A)hasitsgroundpinconnectedto-48Vanditspowerinputconnectedtothesystemground.Fordimming,thecircuit'slogic-levelcontrolsignal(control)islevel-shifteddownto-48VandappliedtotheDIMinput,usingan80V/500mAhigh-voltagePNPtransistor(CMPT5551).ThisdesignideaappearedintheJune23,2009issueofElectronicDesignmagazine.Themainsourceofpowerinatelecommunicationsystemis-48V.Notonlythenegativepolarityofthissource,b
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