FEATURES
n 4.5V to 100V Input Voltage Range n Internal 240mA, 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 Telecom 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 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed. Two external resistors and the transformer turns ratio easily set the output voltage.
Linear Technology
