LT3724, 15V to 12V 25W SEPIC DC/DC converter

Circuit shows LT3724, 15V to 12V,2A SEPIC converter configured to use the 12V output voltage to back drive VCC. The LT3724 uses a 200kHz fixed-frequency current-mode architecture. An internal high voltage bias regulator allows for simple startup and biasing, and it can be back driven by the output to increase supply efficiency and lower power dissipation in the IC