Isolated Flyback Converter

This is an  isolated flyback converter featuring the LT3748 chip from Analog Devices. The circuit is designed for a +/-340V DC (2 x 340V) output from a 7V to 15V_DC input. The output current is up to 2 x 8mA. The board senses the isolated output voltage directly from the primary side flyback waveform during the off time of the power switch. No third winding, optocoupler, or signal transformers are required for regulation. A minimum load of approximately 2% of the maximum load is required on the output to maintain regulation.