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UCC28180: Power surge & sag capabilities

Jia-Wei Seah
Prodigy 25 points
Part Number: UCC28180
Other Parts Discussed in Thread: UCC28950

Tool/software:

Hi,

I am using the UCC28180 in a PFC circuit with the UCC28950 acting as phase-shifted full-bridge circuit.

This circuit is designed to output maximum 48V at 25A (max. 1333W considering 90% efficiency) using 230V 50/60Hz single-phase line input.

I would like to understand if the UCC28180 has any power surge & sag handling capabilities? or are there external components/circuits that needs to be added to be able to handle it.

Below are the standards that I am referring to.

  • Surge Immunity: EN 61000-6-2
  • Voltage Sag Immunity: SEMI F47

Thank you.

  • 0
    TI__Mastermind 40120 points

    Hello Jia-Wei, 

    The UCC28180 PFC controller by itself has no capabilities to handle power surges or sags.  

    It is the actual power conversion components that must sustain the stresses from surges and sags. 

    SEMI F47 requires operation to ride through 12 line cycles of 50% of nominal voltage, and longer cycles at less voltage reduction. 
    Fortunately, the UCC28180 can operate from 85Vac to 265Vac, so PFC operation can continue through these sags from 230Vac nominal without interruption to the controller. 
    But 50% of 230Vac = 115Vac, so the power components (MOSFET, Inductor, Diode, Fuse, EMI inductors) in the power path must be capable of sustaining the higher current expected with full load at the lowest sag voltage.  They must also be thermally capable of the additional conduction-loss dissipation for the duration of the sags.

    Similarly, the surge immunity requirements of EN 61000-6-2 must be handled by the power stage components as well and by proper layout of the PCB tracks to avoid coupling of noise into the controller signal inputs.  In this case, the controller has no capability to reject noise.  It must be protected from external noise to avoid disruption of normal PFC control. 

    Regards,
    Ulrich