LT3574IMS#PBF

The LT3574IMS#PBF is an Isolated Flyback Converter without an opto-coupler 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 0.65A, 60V NPN power switch is integrated along with all control logic. The LT3574 operates with input supply voltages from 3 to 40V and can deliver output power up to 3W with no external power devices. The LT3574 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation. The output voltage is easily set with two external resistors and the transformer turns ratio. Off-the-shelf transformers are available for many applications.