Demonstration circuit 649 is a Telecom isolated DC/DC converter featuring the LTC®3803 constant frequency current mode flyback controller. The DC649 converts an isolated 36V to 72V input and provides 2A of output current at 5V. The 200kHz constant frequency operation is maintained down to very light load to reduce low frequency noise generated over a wide range of load current. The converter provides high output voltage accuracy (typically ±2%) over wide load range with no minimum load requirement. The DC649 also provides non-isolated design by removing opto coupler and LT®1431 circuit. The demonstration circuit can be easily modified to generate different output voltages up to 15V. The output current is limited by total output power to 10W. Higher output voltages and currents can be achieved by changing the MOSFET, transformer and output capacitors. Please consult LTC factory for details. The DC649 has a small circuit footprint. It is a high performance and cost effective solution for Telecom, Automotive and Power over Ethernet applications.