Synchronous rectifier for boost converters

摘要: A boost DC-DC converter with a synchronous composite rectifier is presented. The limits inductive in-rush current, includes shutdown mode, operates also in step-down and can be fabricated using conventional bipolar processes. power NPN transistor lateral PNP transistor. During start-up mode (when the output voltage less than input voltage), drives biased such that volt-second balance maintained, limiting current. In higher disabled driven into saturation. Again, maintained.