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UCC28951-Q1: Controller on primary side

Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951

Tool/software:

Good morning, 

I have been involved in power conversion for years, but this is the first time I have used the UCC28951. The documentation available on the site refers to applications with a regulator positioned on the secondary, thus with “direct” reading of the output voltage and its compensation network that can be sized with spreadsheets or otherwise following the datasheet indications. In the application I am developing (5kW medical), the regulator, due to specific requirements dictated by the product standard, is placed on the primary side; therefore, I have an optocoupler that handles the error signal coming from two stages that handle the maximum voltage and the current limit (the latter therefore also controls the power). That said, I have not found any applications with the regulator on the primary; I also do not understand how to handle the three compensation stages (regulator on the primary, voltage and current via OPA on the secondary). If you have any documentations,  and any suggestions.... I thank you in advance