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TIDA-00779: R2-B470N

Nupur Rathore
Prodigy 10 points
Part Number: TIDA-00779

I am working on designing a Boost PFC based on the TIDA-00779 reference design. I have a question regarding the In-rush current protection. In the reference design a PTC B470N is used, along with a by-pass circuit is used for the same. My question is, can I replace the PTC with a 47 Ohm, 10W through hole resistor with enough delay, before the relay is turned on, to charge caps?

  • 0
    TI__Intellectual 755 points

    Dear customer,

    Thanks for reaching out. You definitely can replace the PTC with a through hole resistor. But PTC is proposed for its variable resistance with temperature. For the through hole resistance, you may need to reserve enough margin so that it will not be broken during power on for mass production.