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UCC28019A: NTC+RY control to limit the Inrush

Chen Alex1
Expert 2725 points
Part Number: UCC28019A

hi Sir

I want to design a 1kw power, use the UCC28019A, I use the NTC to Limit the inrush

now ,I need to Add a Relay,in parallel of the NTC, did you have any advise ?

the ic have any pin to control the Relay?

  • 0
    TI__Mastermind 31320 points

    Hello Alex1,

    Thank you for your interest in the UCC28019A PFC controller. 

    This controller does not have a pin or signal to control a relay to bypass the NTC resistor.
    You can add an external control to turn on the relay after a time delay, or after the PFC output voltage exceeds some level, or based on some other criterion, or a combination of all three.

    The relay and its control circuit will need a power source that is active at (or very shortly after) the time of inrush.  

    Regards,
    Ulrich