LM2577 Datasheet | Texas Instruments

FEATURES - 23 Requires Few External ponents - NPN Output Switches 3.0A, can Stand off 65V - Wide Input Voltage Range: 3.5V to 40V - Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit - 52 k Hz Internal Oscillator - Soft-start Function Reduces In-rush Current During Start-up - Output Switch Protected by Current Limit, Under-voltage Lockout, and Thermal Shutdown TYPICAL APPLICATIONS - Simple Boost Regulator - Flyback and Forward Regulators - Multiple-output Regulator 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 ponents, 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 regulators. 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 k Hz fixed-frequency oscillator that requires no external ponents, 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. Connection Diagrams Figure 1. 5-Lead (Straight Leads) TO-220 (T) - Top View See Package Number KC Figure 2. 5-Lead (Bent, Staggered Leads) TO-220 (T) - Top View See Package Number NDH0005D Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. SIMPLE SWITCHER is a registered trademark of Texas Instruments. All other trademarks are the property of their respective owners. PRODUCTI...