This article below shows Multi Output Power Supply Circuit Design using UC3844. It is designed for power over ethernet applications (POE) or receiver end. The UC3844 acts as the isolated flyback converter which its current mode controller set to operate at 200kHz.
Together with LX1752 which generates the step down dual outputs, this power supply circuitry may have features such 36V to 57V input range, 13W input, adjustable output voltages using external resistors, isolated flyback output, step down switching regulator and power device interface.
See completely about Multi Output Power Supply Circuit Design using UC3844 here (source: microsemi.com)
