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TIC10024-Q1: TIC10024-Q1 Internal Diode reverse Current Spec.

Chun Youngsu
Expert 2485 points
Part Number: TIC10024-Q1
Other Parts Discussed in Thread: TIC12400-Q1

Dear TI Team,

I would like to know the specifications for the reverse current of the internal diode of TIC10024-Q1.

please check.

Thanks.

  • 0
    TI__Intellectual 2285 points

    HI Youngsu, 

    The internal diode is specified as voltage drop instead of current. Please see below: 

    Why is the current for internal diode important in your design?

    thank you,

    Helen

  • 0 in reply to Helen Sun
    Expert 2485 points
    Dear Helen,

    This is to check for malfunction due to leakage current.
     
    Is the leakage current value that can flow in the reverse direction when OFF?
     
    Although it is a reverse blocking diode, it is thought that leakage current will occur.

    please check.

    Thanks.
  • 0 in reply to Chun Youngsu
    TI__Intellectual 2285 points

    Hi Youngsu, 

    What kind of malfunction are you concerned with? 

    Like any reverse blocking diode, there is a very small leakage current present. We do not expect this small leakage current to cause malfunction of TIC12400-Q1 though.

    Regards,

    Helen

  • 0 in reply to Helen Sun
    Expert 2485 points
    Dear Helen,

    The specific malfunction of the customer is not mentioned.
    By default, you must know the value for the reverse current.
    Since HKMC(Hyundai-Kia Motors) can request a specification for a reverse current, we need to know the specification.
    Can I talk about scope?

    Thanks.
  • 0 in reply to Chun Youngsu
    TI__Intellectual 2285 points

    Hi Youngsu, 

    I would like to discuss with you what are the scenarios that the "malfunction" you are concerned with, due to reverse current leakage through the blocking diode.

    For normal operation of MSDI: 

    From the minimum Vs requirement in datasheet, the Vs will need to be at least 4.5V for proper detection. 

    For example, if you connect the INx pin to ground-connected switches and set the register configuration and Vs voltage correctly, the current flow direction is as indicated in the arrow in below graph, so the TIC10024-Q1 would properly detect the switch status. 

    For transient/over voltage events: 

    If you are concerned with transient of the battery and over voltage events such as cranking and load dump conditions, care must be taken when connecting the battery directly to the device on the VS supply pin (through a reverse-blocking diode) or the input (INX) pins. Below is an system example in section 10.3 of TIC10024-Q1 datasheet. 

    Thank you-

    Helen

  • 0 in reply to Helen Sun
    Expert 2485 points

    Dear Helen,

    Thank you for answer.

    Let me ask you one more question.

    I understand the voltage drop across the Foward direction. 

    What I will check is the leakage current value that can flow in the reverse direction at OFF.

    Is this possible?

    Thanks.

  • 0 in reply to Chun Youngsu
    TI__Intellectual 2285 points
    Hi Youngsu,
    You can check this by measuring current coming out of Vs pin. I do not expect much current with the channel being off- there is no internal voltage source in MSDI to generate a current flowing out of Vs pin.

    Thank you,
    Helen