FEATURES
n 3V to 40V Input Voltage Range n 1.25A, 60V Integrated NPN Power Switch n Boundary Mode Operation n No Transformer Third Winding or Opto-Isolator Required for Regulation n Improved Primary-Side Winding Feedback Load Regulation n VOUT Set with Two External Resistors n BIAS Pin for Internal Bias Supply and Power NPN Driver n Programmable Soft-Start n Programmable Power Switch Current Limit n Thermally Enhanced 16-Lead MSOP APPLICATIONS
n Industrial, Automotive and Medical Isolated Power Supplies LT3573 Isolated Flyback Converter without an Opto-Coupler DESCRIPTION
The LT®3573 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary-side flyback waveform. A 1.25A, 60V NPN power switch is integrated along with all control logic into a 16‑lead MSOP package. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
Linear Technology
