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TPD3S713A-Q1: The meaning of ILIM_LO and ILIM_HI

Ailing Wang
Prodigy 130 points
Part Number: TPD3S713A-Q1

Hello Team,

About  pins ILIM_LO and ILIM_HI ,

if I float the ILIM_HI and set the resistor of ILIM_LO 6.8K, then I_OS(typ)=630mA,

which means if the out current exceed 630mA or lower than 630mA,then  assert the over current protection?

  • 0
    TI__Mastermind 28690 points

    Hi Alling,

    The ILIMO LO and ILIMI_HI settings are controlled by the ILIM_SEL pin.  This will allow the system to select between 2 different ILIM settings.

    You cannot float the ILIM_HI pin.  

    To achieve what you are showing, you can tie ILIM_SEL to and ground ILIM_HI pin and attach a 6.98K resistor to the ILIM_LO pin.  This will set the current max to 640mA for all cases.  The ILIM_HI path will never be selected because the current limit is set to always select the ILIM_LO path

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 130 points

    Hello Chuck,

    Thank you for your support!

    Sorry I still confused that

    Chuck Branch said:
    You cannot float the ILIM_HI pin.  

    If I tie ILIM_SEL to the ground,then I select the ILIM_LO to limit the max current to 640mA, So I think it's OK to float the  ILIM_HI pin,correct?

    And by the way, if I set the ILIM_SEL=high, then I select the ILIM_HI pin, so what's the difference of the ILIM_HI pin and ILIM_HI? Both can used to set the maximum current ,correct?

  • 0 in reply to Ailing Wang
    TI__Mastermind 28690 points

    Ailing,

    The datasheet shows that floating ILIM_HI is not a valid state for the device.  In order to guarantee that the datasheet parameters are met, I suggest that you ground the pin because it is a valid configuration of the datasheet.

    I do not think that floating it would cause a failure, but the datasheet parameters for the device are not guaranteed.

    Regards,

    Chuck

  • 0 in reply to Chuck Branch
    Prodigy 130 points

    Got it! thank you very much.

    I will set ILIM_SEL to the ground,and ground the ILIM_HI pin.

    Ailing Wang said:
    And by the way, if I set the ILIM_SEL=high, then I select the ILIM_HI pin, so what's the difference of the ILIM_HI pin and ILIM_HI? Both can used to set the maximum current ,correct?

    How about this?

  • 0 in reply to Ailing Wang
    TI__Mastermind 28690 points

    Ailing,

    Either setting will work as long as the pins are connected within the datasheet, so you idea to use ILIM_SEL=high will work

    Regards,

    Chuck