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.

TPIC84125-Q1 DC current detection

I would like to confirm the DC current detection of TPIC84125-Q1.

The customer did the test for the short to GND and to battery.

In this case, when they shorted to GND, DC current detection operated, but to battery, it did not operate.

The current was about 500mA. I think the cause is their condition. They use VS = 12V.

So, I have questions.

1. Does the specification of IDC (threshould in Low side or or High Side transistor) change by VS value?

2. How does DC current detection operate (check the current or temperature)?

3. If the cause of the problem is low VS voltage, are there any solutions for operating the detection with low VS?

Best regards,

Atsushi Yamauchi

  • Hello Atsushi,

    The appropriate Applications Engineer has been assigned to answer your question(s). You can expect a follow-up response within a few days.

    Regards,

  • Dear Akeem-san,

    How is the situation for this question?

    We got the prod for this question from the customer.

    Best regards,

    Atsushi Yamauchi

  • Atsushi,

    I apologize for the delay, the applications engineer supporting this part is tied up at the moment. I will be looking into this in the meantime.

    Regards,

    Eric Hackett

  • Atsushi,

    My apologies for the delay. How are you measuring the short to battery?  What pin and what conditions?

    VS = 12V shouldn't be a problem.  Over-temperature and over-current are two separate faults. It sounds like they are testing the current diagnostics on the antenna driver.  The over-current condition should be tripped if there is a short to battery condition.  Perhaps the current limit on the power supply was too low?

    Thanks,

    -Clancy

  • Dear Clancy-san.

    I have confirmed the condition. This problem occurred whe power supply "high".

    And Output was shorted through 40 ohm to the battery in the test.

    I don't know why it is OK without over current detection in this case.

    Are there any other detection for this condition?

    And Vs=16V, is DC current detection threshold estimated? (Vs = 38V,  0.15 to 0.35A)

    Could you please teach the value with Vs=16V?

    Best regards,

    Atsushi Yamauchi