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TPS2H160-Q1: About CS settling time (off2)

LEE JONG WON
Prodigy 10 points
Part Number: TPS2H160-Q1

If you look at the specifications of High Side Switch TPS2H160, there is an item called CS settling time from IN falling edge.
It is set to be 20 to 100us, but looking at the actual measurement graph in Figure 43 of the data sheet, it is almost only 4us.
I wonder if this item can change depending on the application.
And I'm curious as to why this spec is needed. Without this Settle Time, what problems can arise? For reference, there are some products that do not have this specification.

Please help.

  • +1
    TI__Guru 57737 points

    Hi Lee,

    Welcome to e2e!.

    Our team is currently on Thanksgiving Holiday. Kindly expect a delay in response. 

  • 0
    TI__Mastermind 32650 points

    Hi Lee,

    The CS pin can double as a fault reporting pin. The CS pin will respond quickly but from our testing, to ensure validity of the output of the CS pin with the device output, we recommend taking into account the settling time while making measurements. We do not expect any problems or damage that can be caused on the device. 

    This settling time is based off a specific test condition but is independent of application.

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    Prodigy 10 points

    Hi Shreyas,

    Thank you for your reply.

    In the process of reviewing it for application to the system, I needed to understand the CS pin.

    I understand that CS is ultimately for detecting faults.

    However, I understand that CS responds to the DIAG_EN pin, but I do not understand why CS remains for a certain period of time when VIN is OFF.

    I am wondering if this is a settling time based on the assumption that a fault may occur depending on the load before the output is completely turned off even if VIN is turned off.

    I am also wondering if this settling time can be adjusted by the user. This is because the measured graph (Figure 43) on the Data Sheet is different from the specifications.

  • +1 in reply to LEE JONG WON
    TI__Mastermind 32650 points

    Hi Lee,

    The settling time is not user settable. The main function of the CS pin is to output a mirrored current from the PowerFET. It can output a fault voltage/current during a fault event. 

    To take into account transition time between the different states, we provide a settling time. 

    For more information on current sensing, please read the following document: https://www.ti.com/lit/an/slvae08/slvae08.pdf 

    Thanks,

    Shreyas

  • 0 in reply to Shreyas Dmello
    Prodigy 10 points

    Hi Shreyas,

    Thank you for your reply.
    I understand to some extent.
    Let's test it and check.
    It was very helpful.

    Thank you