I am looking to design an offline 1KW SMPS using the UCC25600 for a resonant half bridge topology. The design calculation tool (excel file) shows using two N-Mosfets (Q3, Q4) on the transformer secondary, but typical half bridge topologies (and that shown in the Power Stage Designer tool) use Schottky diodes for this application.
Also, when I enter my application data, all of the "current sensing and protection" fields turn to #NAME? errors, rather than calculating a value.
When viewing the circuit diagram, it shows the UCC25600's gate drivers (GD1, GD2) driving a gate drive transformer for Q1 and Q2, but it does not show how to drive Q3 and Q4.
When using the same input and output parameters, the excel calculation tool and the Power Stage Designer tool give vastly different values for the voltage across Q3, Q4. The excel tool shows a Vds of 462V (for example) where the Power Stage Designer shows a max reverse voltage of 809V on the Schottkys.
Finally, is there a SPICE model for the UCC25600?
Thank you!