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UCC28070 single phase operation circuit

Ryuji
Guru 20090 points
Other Parts Discussed in Thread: UCC28070
Hello,
 
Please see the attached file as UCC28070 Phase Management Demonstration.
In attachedfile page 2, there is discription as below.
"When the phase is restarted, there is a short time-delay as the CAO voltage decreases from saturation back down to its normal level, during which time the input current for that phase may increase to the peak current limit."
 
Could you please kindly let me know the circuit for avoid this input current increasing?
 
 
Best Regards,
Ryuji Asaka
  • 0
    Guru 20090 points
    Hello,
     
    Sorry for bothering you.
     
    Please kindly check and give me the information.
    If there is no data, please let me know it.
     
    Best Regards,
    Ryuji Asaka
  • 0 in reply to Ryuji
    TI__Guru* 86266 points

    Using the FET as this paper showed to switch in out am Imo resistor looks to be a pretty good approach. Unfortunately when the second phase turns on it is going to take some time for the current loop to recover as the plot on page 2 shows.  The only thing that you could do is speed up the current loop.  You should be able to safely crossover up to 1/10 the switching frequency of a single phase.