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.

UCC27714: does this device has over temperature protection?

Part Number: UCC27714

Hi,

my customer is using this device to drive MOSFETs.

They observed that when the temperature of the device's surface is 103C, it will stop driving the MOSFETs and the whole equipment will shut down.

But I can't find any description about thermal protection about this device.

  • Hello Howard,

    The UCC27714 does not have over temperature protection internal to the device. It may be that the internal die temperature is exceeding the operating temperature range.

    What is the behavior of the driver, do the gate drive outputs stop operating?

    I would review the gate driver power dissipation which is outlined in the datasheet section 9.2.

    Regards,

  • Richard,

    what will the device behave if the internal die temperature exceeds the operating temperature range?

    By the way, there is no section 9.2 in datasheet.

  • Hello Howard,

    On the datasheet, the section to reference is Section 8.2 in the latest revision. Operation is not guaranteed beyond the abs max junction temperature, the specific behavior that is not normal operation beyond max tJ is not specifically guaranteed.

    One thing that happens at higher temps is that the parameters start shifting. UVLO can shift, the driver devices Rdson is higher and drive current is lower, in some cases leakage currents may increase.

    Can you confirm the VDD operating voltage, driver input signal level, operating frequency, gate resistance and power FET's? We can see if there may be some explanation for temperature sensitivity.

    Regards,