UCC28950: We are not using the synchronize rectifier,

Hello Satishkumar

You are correct, the OUTE and OUTF pins should be left open circuit if they are not being used. It is also a good idea to use a zero Ohm link to connect the DCM pin to VREF so that the OUTE and OUTF signals are not generated by the UCC28950 controller. This has no bad effects on the controller operation and will reduce system noise by eliminating the high dv/dt edges on OUTE and OUTF. Removing the link allows you to enable the SR signals if you later change your mind.

Regards
Colin

Hello Sathishkumar

There are several training videos on the PSFB topology at training.ti.com/search-catalog
You will also find useful design information at www.ti.com/.../login.shtml

There are some application notes and a user guide to the EVM on the product page for the UCC28950 - you should consider using the newer UCC28951 instead.

There are excel and MathCad design tools on the product page. Both do more or less the same task but the MathCad tool has a little more detail

There is a worked design example in the data sheet - this may give you some ideas of how the product should be used.

Finally there are some reference designs - for example the PMP6712 - listed on the product page under the Tools and Software tab.

the e2e forum is always available too.!

Please let us know if you have any questions

Regards
Colin

Sathishkumar.

Diode rectification can be used in the PSFB without any problems. SRs are used to reduce conduction losses in high current outputs and are especially useful for lower output voltages. SRs are almost universally used for high current 12V outputs for example. At output voltages above about 200V diode rectification becomes more attractive especially at very high voltages where SiC diodes are usually used.

Topologically, both rectifiers are the same - if you have a schematic with SRs you can simply replace the SRs with diodes.

Regards

Colin