Iam working 140VDC-70VDC range input 24V/1.5A range output DC-DC converter for railways application.
There is almost no output voltage variation at light load but at 1.5 A load, the output voltage is 24.20V at 140VDC and 23.68V at 70VDC.
There were distortions in the gate signal at low load. I solved the light load ripple problem by putting a 33nf capacitor on the IREG/SS pin and putting a 3.9nF capacitor between the input and output of the transformer.
[edited by: lallison at 2:08 PM (GMT -4) on 23 May 2022]