Part # LM2577 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM1577 LM2577 SIMPLE SWITCHER® Step-Up Voltage Regulator

Part Details:

LM1577/LM2577 April 2005 LM1577/LM2577SIMPLE SWITCHER® Step-Up Voltage RegulatorGeneral Description Features SIMPLE The LM1577/LM2577 are monolithic integrated circuits that n Requires few external components provide all of the power and control functions for step-up n NPN output switches 3.0A, can stand off 65V (boost), flyback, and forward converter switching regulators. n Wide input voltage range: 3.5V to 40V The device is available in three different output voltage n Current-mode operation for improved transient versions: 12V, 15V, and adjustable. response, line regulation, and current limit Requiring a minimum number of external components, these SWITCHER n 52 kHz internal oscillator regulators are cost effective, and simple to use. Listed in this n Soft-start function reduces in-rush current during start-up data sheet are a family of standard inductors and flyback n Output switch protected by current limit, under-voltage transformers designed to work with these switching regula- lockout, and thermal shutdown tors. Included on the chip is a 3.0A NPN switch and its associated Typical Applications protection circuitry, consisting of current and thermal limiting,and undervoltage lockout. Other features include a 52 kHz n Simple boost regulator fixed-frequency oscillator that requires no external compo- n Flyback and forward regulators Step-Up nents, a soft start mode to reduce in-rush current during n Multiple-output regulator start-up, and current mode control for improved rejection ofinput voltage and output load transients. Connection Diagrams Voltage Straight Leads Bent, Staggered Leads 5-Lead TO-220 (T) 5-Lead TO-220 (T) Regulator 01146804 01146805 Top View Top View Order Number LM2577T-12, LM2577T-15, Order Number LM2577T-12 Flow LB03, LM2577T-15 or LM2577T-ADJ Flow LB03, or LM2577T-ADJ Flow LB03 See NS Package Number T05A See NS Package Number T05D SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS011468

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LM2577.pdf Datasheet