48V 1A Boost converter MC34063A

Boost converter experiment.

12.1v input
48V output, ideally up to 2A

Results with 68R load on output.

Input current = 12.1v @4.5A

which gives 54.9W

Output current = 735mA @ 48v

Gives 36.7W

Efficiency is 67% which isn’t good. This is not helped by the IGBT which I used as the switching transistor has a VCE Saturation of 2v which is a loss of power but all I had that would switch the sort of current I need

Also my output frequency changes when I close the loop. Need further investigation