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The BPA8504D is a high-performance switcher integratedcircuits with low standby consumption. The BPA8504D canbe easily configured as buck, buck-boost, or flybacktopologies for universal Ac inputs.The BPA8504D integrates a 700V power MOSFET, a high-voltage current source for self-biasing, a current sensingExternal loopcircuit, and an advanced controller.compensation components can be mostly eliminated,which reduces cost and size of overall power systems, andmeantime achieves high reliability