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TPS2HCS10-Q1: TPS2HCS10-Q1: Tolerance and MIN/MAX values for IOCP (Immediate Shutdown Threshold)?

IKUTA
Prodigy 50 points

Part Number: TPS2HCS10-Q1

Hello TI Team,

I am currently designing an eFuse circuit using the TPS2HCS10-Q1 and evaluating the worst-case margins for our system's overcurrent protection.

In the datasheet (Section 6.5 Electrical Characteristics), the "Overcurrent protection threshold, immediate shutdown" (IOCP) is listed with TYP values ranging from 10A to 25A depending on the ILIMIT_SET_CHx register setting. However, there are no MIN or MAX values specified for these threshold settings.

Could you please clarify the following points?

  1. What is the expected tolerance (MIN/MAX variation) for the IOCP thresholds across the full operating temperature range and process variations?
  2. Is the IOCP detection mechanism completely independent of the KSNS current sense circuitry? We assume that IOCP uses a faster, dedicated internal comparator and therefore has a wider tolerance than the ±5% accuracy specified for the KSNS output, but we would like to confirm this.

Any guidance or data on the IOCP tolerance would be greatly appreciated to ensure a safe and robust design.

Thank you in advance for your support!

  • 0
    TI__Expert 6760 points

    Hi,

    I will have to take a look at this tomorrow (3/17).

    Thanks,

    Filip

  • 0 in reply to Filip Rados
    TI__Expert 6760 points

    Hi Ikuta,

    We do not spec MIN/ MAX values for IOCP. Additionally, IOCP is not correlated to KSNS.

    Thanks,

    Filip

  • 0
    Prodigy 50 points

    Hi Filip,

    Thank you for the quick clarification. I understand that TI does not officially specify the MIN/MAX limits for the IOCP threshold in the datasheet and that it is independent of the KSNS circuitry.

    However, since we are designing an automotive system using this "-Q1" device, we are required to perform a rigorous Worst-Case Circuit Analysis (WCCA). Without any understanding of the lower bound of the IOCP threshold, we cannot analytically prove that the eFuse will not experience "false tripping" during our system's maximum normal operating current.

    Could you please provide some guidance on the following so we can justify our design?

    1. Characterization / Simulation Data (Reference Only):
      Even if it cannot be guaranteed as a datasheet specification, do you have any characterization bench data, expected ±3σ distribution, or design simulation boundaries for the IOCP variations across temperature and process? We are just looking for a reference range (e.g., ±20%, ±30% from TYP).
    2. Design Recommendation for Margin:
      Based on the internal design of this IOCP comparator, what margin do you recommend we keep between our system's absolute maximum load current and the selected IOCP TYP value to safely avoid unintended immediate shutdowns?

    Any reference data or engineering "rule of thumb" you can share would be extremely helpful for us to proceed with this device.

    Thank you again for your support.

    Best regards,

    IKUTA

  • 0 in reply to IKUTA
    TI__Expert 6760 points

    Hi Ikuta,

    I will have to get back to this later in the week.

    Thanks,

    Filip

  • 0 in reply to Filip Rados
    TI__Expert 6760 points

    Hi Ikuta,

    I am forwarding this internally to get an answer by early next week for both questions.

    Thanks,

    Filip

  • +1 in reply to Filip Rados
    TI__Expert 6760 points

    Hi Ikuta,

    All I could find was that, as a reference, IOCP variation should be about +/- 20%.

    Thanks,

    Filip

  • 0 in reply to Filip Rados
    Prodigy 50 points

    Hi Filip,

    Thank you for digging into this and sharing the reference data.

    Best regards,
    Ikuta