LM2587SX-12 Datasheet PDF - National

●General Description

●The LM2587 series of regulators are monolithic integrated circuits specifically designed for flyback, step-up (boost), and forward converter applications. The device is available in 4 different output voltage versions: 3.3V, 5.0V, 12V, and ad justable.

●Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Included in the datasheet are typical circuits of boost and flyback regulators. Also listed are selector guides for diodes and capacitors and a family of standard inductors and flyback transformers designed to work with these switching regulators.

●Features

●Requires few external components

●Family of standard inductors and transformers

●NPN output switches 5.0A, can stand off 65V

●Wide input voltage range: 4V to 40V

●Current-mode operation for improved transient response, line regulation, and current limit

●100 kHz switching frequency

●Internal soft-start function reduces in-rush current during start-up

●Output transistor protected by current limit, under voltage lockout, and thermal shutdown

●System Output Voltage Tolerance of ±4% max over line and load conditions

●Typical Applications

●Flyback regulator

●Multiple-output regulator

●Simple boost regulator

●Forward converter