limit threshold application_number US 201113193284 A description embodiments of methods and apparatuses for maintaining a power supply output current substantially constant independent of input voltage at the point where the power supply output characteristic transitions from providing an approximately constant output voltage to supplying an approximately constant output current are disclosed in the following description numerous specific details are set forth in order to provide a thorough understanding of the present invention it will be apparent however to one having ordinary skill in the art that the specific detail need not be employed to practice the present invention in other instances well known materials or methods have not been described in detail in order to avoid obscuring the present invention reference throughout this specification to u201c one embodiment u201d or u201c an embodiment u201d means that a particular feature structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention thus the appearances of the phrases u201c in one embodiment u201d or u201c in an embodiment u201d in various places throughout this specification are not necessarily all referring to the same embodiment furthermore the particular features structures or characteristics may be combined in any suitable manner in one or more embodiments in one embodiment here a switched mode power supply is described in which the output current below the output voltage threshold is regulated to be approximately constant this provides an approximate constant voltage constant current output characteristic the output current level at the output voltage threshold in known power supplies sensed at the output of the power supply to provide feedback to a regulator circuit coupled to the primary winding of the power supply if however the approximate constant current functionality.