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LM1577 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM1577 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 31 page  LM1577/LM2577 SIMPLE SWITCHER® Step-Up Voltage Regulator General Description The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable. Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and flyback transformers designed to work with these switching regula- tors. Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and undervoltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external compo- nents, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients. Features n Requires few external components n NPN output switches 3.0A, can stand off 65V n Wide input voltage range: 3.5V to 40V n Current-mode operation for improved transient response, line regulation, and current limit n 52 kHz internal oscillator n Soft-start function reduces in-rush current during start-up n Output switch protected by current limit, under-voltage lockout, and thermal shutdown Typical Applications n Simple boost regulator n Flyback and forward regulators n Multiple-output regulator Connection Diagrams Straight Leads 5-Lead TO-220 (T) Bent, Staggered Leads 5-Lead TO-220 (T) 01146804 Top View Order Number LM2577T-12, LM2577T-15, or LM2577T-ADJ See NS Package Number T05A 01146805 Top View Order Number LM2577T-12 Flow LB03, LM2577T-15 Flow LB03, or LM2577T-ADJ Flow LB03 See NS Package Number T05D SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. April 2005 © 2005 National Semiconductor Corporation DS011468 www.national.com |
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