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UCC28180EVM-573: The reason for FET damage

Satoshi
Guru 19495 points
Part Number: UCC28180EVM-573

Customer is evaluating UCC28180EVM-573 for below condition, but when output power increased No load to 80W, FET was damaged.

Please let me know about possibility of the reason for FET break.

-------------------------------------------

・Vin：85V

・Pout：No load to increase 80W

・Evaluating condition are the same as User's Guide and default setting. 

　One only difference, Vcc is 15V from external DC power supply. (User's Guide is Vcc：12V) 

-------------------------------------------

 

Best regards,

Satoshi

  • 0
    TI__Mastermind 31580 points
    Hi Satoshi-san

    There should be no reason why this failure should occur. Can you order another EVM for the customer ?

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Guru 19495 points

    Peter-san

    Thank you for quick reply,

    Customer have EVM only one board, and they will replace broken parts and evaluate again.

    Updated information, broken parts are switching FET and gate Diode, picture is attached below.

    This picture look like insulation failure, because of Ark marks and broken insulation sheet.

    I think that if screw clamp is tight, insulation sheet become thin and decrease insulation voltage, it is one of reason.

    Is this correct? and, is there the other reason?

    Best regards,

    Satoshi

  • 0 in reply to Satoshi
    TI__Mastermind 31580 points
    Hi Satoshi-san,

    I think the must have been some breakdown with the insulation either due to mechanical stress or some particle getting in between the insulator and the device.

    We can offer the customer a free EVM if this helps.

    Regards

    Peter
  • 0 in reply to Peter Meaney
    Guru 19495 points
    Peter-san

    Thank you for kind support,
    Already new EVM was ordered by TI Japan.

    Near future, I will support this EVM.
    If there any update for evaluating, I will feedback this information to you.

    Best regards,
    Satoshi