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TPS272C45: No-Load current value ?

Gerard HEUTTE
Prodigy 10 points
Part Number: TPS272C45

Tool/software:

Hello.

We use TPS272C45ARHFR component to drive some loads.

In the datasheet, we cannot find the minimum current in the load to avoid the "no-load" detection.

Can you provide us this parameter ?

Thank you.

  • 0
    TI__Mastermind 29240 points

    Hi Gerard,

    TPS272C45 does not have open load detection when the device is enabled. It only reports an open load when disabled.

    Thanks,

    Patrick

  • 0
    Prodigy 10 points

    Hello Patrick

    Thank you for your quick answer.


    Our loads are not always powered, sometimes enabled and sometimes not....

    I suppose that the mean of detection of open load is based on a current.

    What we look for is the "smallest" load that can be used to avoid open load state.

    Best regards

  • 0 in reply to Gerard HEUTTE
    TI__Mastermind 29240 points

    Hi Gerard,

    That's correct, to determine an open load during on state, the MCU or external ADC will need to read the SNS pin voltage to determine this at the relevant threshold. To increase ADC resolution, you can have two SNS resistors in parallel and control one with a FET. When the FET is on, the SNS resistance is lower which can be for steady state operation. When the FET is off, the SNS resistance is higher, which can be used to increase scaling at low currents and give more resolution to determine what is an open load or not.

    When the channel is off, the device will report an open load if VOUT is within about 2V of VS.

    Thanks,

    Patrick