LT3511 Datasheet | Linear Technology

Monolithic High Voltage Isolated Flyback Converter Features n 4.5V to 100V Input Voltage Range n Internal 240m A, 150V 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 Switch Driver n No External Start-Up Resistor n 16-Lead MSOP Package APPLICATIONS n Isolated Tele Power Supplies n Isolated Auxiliary/Housekeeping Power Supplies n Isolated Industrial, Automotive and Medical Power Supplies DESCRIPTION The LT®3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 240m A, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed. The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power. Two external resistors and the transformer turns ratio easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522. TYPICAL APPLICATION 48V to 5V Isolated Flyback Converter VIN 36V TO 72V 1μF 1M EN/UVLO 4:1 t 300μH 19μH 43.2k t 169k RREF 10k TC VC SW GND BIAS 69.8k 16.9k 3.3n F 4.7μF 3511 TA01a VOUT+...