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TPS1HTC30-Q1: Explation between fault and mosfet gate

Oguzhan Sari
Prodigy 10 points
Part Number: TPS1HTC30-Q1

Tool/software:

Hi, I did some tests with the TPS1HTC30. I observed a situation I don't understand and I couldn't find explanation in the datasheet.

The situation is; when the current is close to the limit (about 10% below the current limit), the fault drops and the IC starts to heat up.

Our think is reduces the Gate voltage with the Fault Flag.

So what causes this situation?

  • 0
    TI__Expert 7871 points

    Hi Oguzhan,

    The current limit has a range based on the KCL min/max values. 

    When the device is actively clamping the current, there is more power loss and the device heats up. The fault will also go low to indicate the overcurrent condition.

    What is the ILIM resistor and current limit you are trying to set the device to?

    Best Regards,

    Rishika Patel 

  • 0 in reply to Rishika Patel
    Prodigy 10 points

    Hi Rishika,

    Our ILIM resistor is 24.9K Ohm and current limit is 4A.

    Fault goes low around 3.6A.

  • +1 in reply to Oguzhan Sari
    TI__Expert 7871 points

    Hi Oguzhan,

    Since parameters may vary across PVT (process, voltage, and temperature), we would have to consider the tolerances given. So, the ILIM range is 3.2/4.0/4.8A (ILIM = KCL/RILIM) as the MIN/TYP/MAX respectively based on the KCL range given and RILIM = 24.9k.

    Best Regards,

    Rishika Patel