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LM2577S-ADJ Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2577S-ADJ Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 27 page LM1577/LM2577 Series 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 ver- sions: 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 Typical Application Ordering Information Temperature Range Package Type Output Voltage NSC 12V 15V ADJ Package Package Drawing −40˚C ≤ T A ≤ +125˚C 24-Pin Surface Mount LM2577M-12 LM2577M-15 LM2577M-ADJ M24B SO 16-Pin Molded DIP LM2577N-12 LM2577N-15 LM2577N-ADJ N16A N 5-Lead Surface Mount LM2577S-12 LM2577S-15 LM2577S-ADJ TS5B TO-263 5-Straight Leads LM2577T-12 LM2577T-15 LM2577T-ADJ T05A TO-220 5-Bent Staggered LM2577T-12 LM2577T-15 LM2577T-ADJ T05D TO-220 Leads Flow LB03 Flow LB03 Flow LB03 −55˚C ≤ T A ≤ +150˚C 4-Pin TO-3 LM1577K-12/883 LM1577K-15/883 LM1577K- ADJ/883 K04A TO-3 SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation. DS011468-1 Note: Pin numbers shown are for TO-220 (T) package. June 1999 © 1999 National Semiconductor Corporation DS011468 www.national.com |
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