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Original question:

UCC28180: PFC Design Questions

UCC28180: Whether the damage of UCC28180 is caused by discharging the output capacitance with resistance ?

JansonWu
Prodigy 90 points
Part Number: UCC28180

When I disconnect the circuit, I will use resistance to discharge the output capacitance. Will this cause IC damage?

Because the circuit has been on and off for many times, there will be IC damage.

In addition, I have a surge current absorbing circuit at the input end of the power supply.

  • 0
    TI__Expert 6080 points

    Hello Janson,

    UCC28180 relies on the line current(input current) information from the current sense resistor to determine the power deliverability. I think because of the multiple turn-ON and OFF events (similar to line transients), each turn-ON would have a big pulse of current through the current sense resistor. I would recommend checking the maximum surge current (inrush current circuit) and comparing it to the current limit set by the UCC28180 through the current sense resistor. 

    If the current sense resistor gets damaged, there would be the max inrush current to the UCC28180 which would damage the controller.

    I hope this helps.

    Regards,

    Sonal

  • 0 in reply to Sonal Singh
    Prodigy 90 points

    Thank you, I'll check it as you suggested.