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primary side vs secondary feedback

Other Parts Discussed in Thread: UCC28780, UCC28950

Dear All,

i have some questions about primary side controllers:

1) does primary side preciesly control the output voltage of a converter as common secondary side feedback?

2) what is the difference between primary side and usual feedback converters?

3) what advantages does offer primary side compare to usual feedback?

4) in which applications it is best to select primary side controllers?

Best Regards,

Ras