• State TI Thinks Resolved
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 58 views
  • Users 0 members are here
Support feedback
Options
Options
Related

UCC28180: UCC28180( PFC IC_) How get up to PF 0.9 ?

C-WEN LAI
Prodigy 20 points
Part Number: UCC28180

Tool/software:

UCC28180( PFC IC_)  : Input voltage  115vac / 400 hz , PFC Voltage set  260Vdc ,  output power is 60W ,  Get  PF : 0.86 . 

                                       How to up to  PF : 0.90 ?  

                          Thank for help 

  • 0
    TI__Genius 12795 points

    Without knowing you design, it is impossible to answer your question.

  • 0
    TI__Mastermind 40150 points

    Hello C-Wen Lai, 

    For 400Hz AC input, the most likely cause of low PF is too much X-cap in the EMI filter. 

    At 400Hz, the line-filter X-cap impedance is 1/8 that of 50Hz line, so reactive current is 8X higher. 
    This higher reactive current lowers the PF especially with only a 60W real load current. 

    There may be some distortion in the current, too, but you did not provide any waveforms or schematic diagram.
    Without these, excess X-cap value is my best guess to account for your low PF. 

    Regards,
    Ulrich