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UCC28070: Starting configuration

Ilia Hadzhiev
Prodigy 200 points
Part Number: UCC28070

Hello,   

i just have made PCB prototype of semi-bridgeless PFC using UCC28070

can you suggest me how to start up the development process, can i use 60 Volts DC for input voltage
for debugging and testing the controller and topology configuration. Any information will be in a use. Thank you. 

Regards, Ilia. 

  • 0
    TI__Mastermind 25570 points

    Hello Ilia

    Unfortunately I don't have a prepared debug procedure for the UCC28070 but here are some general guidelines.

    I would disable the controller and one of the two boost stages completely. Put a low DC voltage on the input and power the other PFC stage by driving its MOSFET with a 12V square wave. The power stage should boost the input voltage to twice the input. Check that the power stage waveforms look ok - especially the Vds of the MOSFET and the current sense signal. You can load the output and verify that the CS signal is correct. Once you are happy that the power stage is running from a low DC input voltage you should increase the input voltage to about 200V so that the output is at 400V and then load the stage to about 50% of it's full load. Once this is done you can be reasonably sure that the power stage is working ok. Repeat this process with the other power stage.

    Then re-connect the UCC28070 and run the system from a low DC voltage. The controller will boost the input to 400V - check the waveforms. Then apply AC.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Prodigy 200 points

    Thank you Colin i will follow that.  Also i think to use auto transformer and to start with 20 Vac_RMS , and boost the output to 60 Vdc, my plan is to use the Excel Design Tool with those parameters and to do some research on the controller work. Do you see something wrong in that. 

    Regards