Hello,
As I understood your on-site simulation program does not support development of
an isolated (with transformer) DC/DC, for example V_in = 28V, V_out = - 5V@2A isolated.
Please, could you propose any your ready design or the kit (IC, transformer, etc) for
development this DC/DC (V_in = 28V, V_out = - 5V@2A isolated)?
Alex