Is it possible to have spice model for VIPER31 models to be used with LTSPICE? Actual model can run only on Cadence PSPICE. Since PSPICE is not free we have no possibility to simulate components and relative circuits

What's the best way to design an AC-DC converter using viper26ld on 4 to 6 layers PCB?e.g. signal traces, power traces, power planes, etc..Thanks