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TPS386000-Q1: Request for circuit diagram review and problem review

MJ Jeon
Genius 5240 points
Part Number: TPS386000-Q1

Hi, Support Team

A customer is developing a product using the TPS386000-Q1.

Please review the circuit below.

The circuit is configured as above, and a problem occurs during verification, so we will contact you.

Problem : RESETn doesn't change to high

We are currently examining the cause of the problem internally, but please check if there is a problem in the circuit.

Thanks.

Regards,

MJ

  • +1
    TI__Guru 54645 points

    Hi MJ,

    I don't see an issue with the schematic.

    Ben

  • 0 in reply to Ben C
    Genius 5240 points

    Hi, Ben

    Thank you for your reply.

    I asked the question before, but when the above circuit is configured and the operation is performed, the output of Resetn is not working at all.

    I want to check the status of whether the IC itself is running, but is there a way to check it?

    And the Sense4L/H is currently open, but is the cause of the non-operation not related to this?

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru 54645 points

    Hi MJ,

    Is there a way you can tell me the voltages going to SENSE1, SENSE2, and SENSE3? 

    You can GND both SENSE 4L and 4H.   

    Is the /MR pin actually tied to the rail voltage?

    I see that /RESET1, /RESET2, /RESET3 are tied together.  Are those signals being pulled up to the 1.8V via a pull-up resistor?

    My suggestion is to test each channel to make sure they are operating correctly.  When the SENSE1, SENSE2 and SENSE3 are above (VIT- + VHYS), the /RESET signals should become deasserted. 

    Correctly me if I am wrong, but is VDD set at 3.3V?

    Ben

  • 0 in reply to Ben C
    Genius 5240 points

    Hi, Ben

    I have additional questions.

    The timing chart below explains the reset operation according to the sense.

    Is it correct that the reset pin output goes low when a voltage over 400mV is applied to the sense pin?

    The timing chart appears to show that the reset pin goes high when voltage is input to the sense pin.

    Please explain the timing chart above.

    Thanks.

    Regards,

    MJ

  • +1 in reply to MJ Jeon
    TI__Guru 54645 points

    Hi MJ,

    The reset pins deasserts (gets pulled up to rail voltage) when the SENSE1/2/3 are above 400mV.

    In the timing diagram that you have shown, once SENSE2 is above (VIT- + Vhys) and continues beyond td, /RESET2 will be deasserted and goes high.

    Ben

  • 0 in reply to Ben C
    TI__Guru 54645 points

    Hi MJ,

    Any updates with the customer's issue?  

    Ben

  • 0 in reply to Ben C
    Genius 5240 points

    Hi, Ben

    Thank you for your answer.
    The customer has confirmed that it works normally.
    If additional issues are received, we will contact you again.

    Thanks again for the quick reply.

    Regards,

    MJ

  • +1 in reply to MJ Jeon
    TI__Guru 54645 points

    Hi MJ,

    That is great news!  Sounds like the issue has been resolved.  Please go ahead and close the thread by clicking on  "resolved".  Thanks MJ and good luck to you!

    Ben

  • 0 in reply to Ben C
    Genius 5240 points

    Hi, Ben

    I have additional questions.

    Regarding the circuit above, is the value of R64 connected to SENSE4H okay in O ohm?

    Is there a problem in function or operation?

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru 54645 points

    Hi MJ,

    Connecting a 0ohm resistor to GND on SENSE4H should be okay to do because the input of SENSE4H is high-impedance.  See below:

    Ben