• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 62 subscribers
  • Views 569 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28180: The gate drive pin is damaged for unknown reasons

wang chao
Prodigy 40 points
Part Number: UCC28180


I am using UCC28180 to design a 1kW PFC converter, generally it works well. But sometimes when I connect the AC-input with no load, the  gate drive pin is damaged for unknown reasons, and the output of gate drive pin is always 0V after that. I am confused which reason can cause such fault. Please help me.

  • 0
    TI__Guru* 86286 points

    Hello,

    Is the FET get damaging as well?

    Do you have an inrush bypass diode across the boost stage?  This would be diode D2 in the evaluation module schematic.  You can find it at the following link.

    If you don't have this during inrush the FET can turn on and the UCC28180 may not be fast enough to protect the FET from this over current.  Also the output can ring up to twice the output voltage.

    The other things that will damage a gate driver is voltage conditions going above and below the absolute minimum and maximums.  For negative going voltages if the gate drive could seem more 450 mV below ground it could become damaged.  This is easily resolved with a resistor between the driver output and the FET and/or a Schottky diode tied across the output driver.

    Regards,

  • 0 in reply to Mike O'
    Prodigy 40 points

    Thanks a lot! Acturally, I do have an inrush bypass diode across the boost stage. The attached file is part of my schematic diagram. I think the gate drive circuit and inrush bypass diode are right. If the voltage of ISENSE PIN is below than its minimum limit,  does this cause damage to the drive pins？

  • 0 in reply to wang chao
    TI__Guru* 86286 points

    Hello,

    If the pin goes more than abs minimum which is 300 mV below ground it can damage the gate drive.  This can cause damage to the gate drive and or latch up to the IC. 

    Regards,