The LT3748 is a simple to use, high input voltage, isolated flyback controller that does not need an optocoupler and shunt regulator or optocoupler driver to complete the circuit. These features, combined with extra pin spacing for high voltage operation, simplify the design, allow for a smaller solution size and require only one component crossing the isolation barrier. Competing products require an optocoupler and a shunt regulator or optocoupler driver to complete the circuit, and do not have extra IC pin spacing for high voltage operation.