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TPS1H100-Q1: DIAG_EN pin connect

DY Ko
Expert 4170 points
Part Number: TPS1H100-Q1
Other Parts Discussed in Thread: TPS1H100B-Q1

Hello team,

My customer want to use the TPS1H100B-Q1 for current limit protection only without using other diagnostics.
Is it O.K. to connect the DIAG_EN pin to device GND in this case also as attached schematic below?

Best regards,
DY

  • 0
    TI__Mastermind 22250 points

    Hi, 

    Yes, if you do not need the current sense analog output from the current sense pin, you can short the DIAG_EN pin to GND. 

  • 0 in reply to Anthony P Pham
    TI__Expert 4170 points

    Hi Anthony,

    Thanks for your quick response.

    You mean the TPS1H100B-Q1 can suport the current limit protection by setting the current limit threshold(my customer's case: 2.466A) with exteral 1 kohm resistor at CL pin even though the DIAG_EN pin is connected to GND. Am I understanding correctly?

    Best regards,
    DY

  • 0 in reply to DY Ko
    TI__Mastermind 22250 points

    Hi DY,

    With a 1kOhm resistor, the calculated current limit is 3.0825A. If you'd like to set the current limit to 2.466A, you should use the closest resistor value to 1.25-kOhms. 

    In regards to your question, yes, the device can support current limit protection with the DIAG_EN pin connected to ground.

    The DIAG_PIN when pulled high enables diagnostics, which in the case of the B version, allows for measuring the current as a voltage level using an external resistor. 

    If you do not need external current measurents, then it is fine to pull the DIAG_EN pin to ground.

  • 0 in reply to Anthony P Pham
    TI__Expert 4170 points

    Hi Anthony,

    Thank you.

    But I don't understand why the 1.25 kohm was recommended, instead 1kohm.
    Because the calculated resistor value was 1 kohm for 2.466A current limit threshold based on the equation (12) as below in the datasheet.

    Best regards,
    DY

  • 0 in reply to DY Ko
    TI__Mastermind 22250 points

    Oh yes, my mistake it looks like I had incorrectly referenced a number. The 1-kOhm is correct.

    My apologies.