The LT3798 is an easy to use, no optocoupler required, active PFC single stage high voltage isolated flyback controller that simplifies the design, allows for a smaller solution size, and only requires one component crossing the isolation barrier. Most other competitive solutions require an extra PFC power stage, optocoupler and a LT1431 shunt regulator/opto-driver to complete an isolated flyback circuit. For more information and samples, visit the Linear Technology web site.