UCC29950EVM-631: UCC29950EVM-631:

Hi Steve
In principle the eval module could be modified but there is significant work involved - here is a short list

Redo the calculations relating to the design which are shown in the UCC29950 datasheet.
Change the transformer for one with the correct turns ratio for the output voltage - again the design procedure in the DS will guide you here.
Change the output capacitors to higher voltage parts with the correct capacitance value for 60V out.
Change the transformer turns ratio to generate a 60V output on the secondary.
Change the output rectifiers to higher voltage parts - Probably 80V would be ok - again the calculations in the datasheet would guide you on this.
The TL431 has a maximum cathode voltage of about 36V (if memory serves) - the point is that a 60V output will overvoltage the cathode under some operating conditions. If you set the 'typical' cathode voltage to let's say 20V, then you can use a zener diode to clamp its cathode to a voltage within its allowed range.
You will have to alter the output voltage sensing resistors.
For optimum feedback loop performance you will need to change the loop feedback components - but this may not be necessary for initial testing if you are happy with a slower loop response.

Making these changes to the eval module are not trivial. In particular you will find it difficult to remove the power transformer but having said that, given that you are willing to do the rework, you should be able to make the module output 60V.

The PFC stage of course won't need modification.

Regards
Colin

Hi Colin,

Thanks for the quick reply!
I will give it a try.

Steve