Part # LM2588 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM2588 SIMPLE SWITCHER® 5A Flyback Regulator with Shutdown


Part Details:

LM2588 July 2005 SIMPLE LM2588SIMPLE SWITCHER® 5A Flyback Regulator withShutdown SWITCHER General Description Features The LM2588 series of regulators are monolithic integrated n Requires few external components circuits specifically designed for flyback, step-up (boost), and n Family of standard inductors and transformers forward converter applications. The device is available in 4 n NPN output switches 5.0A, can stand off 65V different output voltage versions: 3.3V, 5.0V, 12V, and ad- n Wide input voltage range: 4V to 40V justable. n Adjustable switching frequency: 100 kHz to 200 kHz Requiring a minimum number of external components, these n External shutdown capability 5A regulators are cost effective, and simple to use. Included in n Draws less than 60 µA when shut down the datasheet are typical circuits of boost and flyback regu- n Frequency synchronization Flyback lators. Also listed are selector guides for diodes and capaci-tors and a family of standard inductors and flyback trans- n Current-mode operation for improved transient response, line regulation, and current limit formers designed to work with these switching regulators. n Internal soft-start function reduces in-rush current during The power switch is a 5.0A NPN device that can stand-off start-up 65V. Protecting the power switch are current and thermallimiting circuits, and an undervoltage lockout circuit. This IC n Output transistor protected by current limit, under Regulator voltage lockout, and thermal shutdown contains an adjustable frequency oscillator that can be pro-grammed up to 200 kHz. The oscillator can also be synchro- n System output voltage tolerance of ±4% max over line nized with other devices, so that multiple devices can oper- and load conditions ate at the same switching frequency. Other features include soft start mode to reduce in-rush Typical Applications current during start up, and current mode control for im- n Flyback regulator proved rejection of input voltage and output load transients n Forward converter with and cycle-by-cycle current limiting. The device also has a n Multiple-output regulator shutdown pin, so that it can be turned off externally. An n Simple boost regulator output voltage tolerance of ±4%, within specified input volt-ages and output load conditions, is guaranteed for the power Shutdown supply system.


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LM2588.pdf Datasheet