TPS54540DDAR by TI(德州仪器) Design and production,in One Stai Electronic Co, LTD Spot sales,And can pass One Stai Electronic Co, LTD Purchasing。TPS54540DDAR Price reference $ 2.986239。TPS54540DDAR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information TPS54540DDAR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial