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Original question:

TPS1HA08-Q1: recommended current vs current limit

TPS1HA08-Q1: TPS1HA08C-Q1

Masayuki Uchihara
Intellectual 1686 points
Part Number: TPS1HA08-Q1

Hi Team,

We try to use TPS1H08C-Q1.  The current limit is 20A but in our cases this limit is a little bit high. so we try to control to stop this device to gives low voltage to EN using micro computer by detecting output current using SNS current.

If the device has inrush current, the SNS status goes ISNFH. so we cannot realize above system control.

However in my understanding If the LATCH pin connected ground, the SNS status doesn't keep ISNFH even inrush current happend. And the SNS status go back current sense output. Is it correct? 

Thanks,

Masayuki Uchihara

  • 0
    TI__Expert 3500 points
    Masayuki-

    Your understanding is correct. If the latch pin is set to auto-retry, when the device turns back on and the voltage goes past 1V on the output then the SNS pin will reset into a current sense mode rather than the ISNSFH value. In this case, you should be able to use it to monitor the over-current threshold whereever you would like.

    Thanks,
    Alec
  • 0 in reply to Alec Forbes
    TI__Intellectual 1686 points
    Hi Alec,
    Thank you for your reply.
    Is it possible to use SNS, ST and Latch pin normally even if the EN is low?
    Do you have any concern about controlling this IC when the EN is low?

    Thanks,
    Masayuki
  • 0 in reply to Masayuki Uchihara
    TI__Expert 3500 points

    Uchichara-san,

    SNS, ST, and Latch will all operate even when EN is low, however they will function in a different manner than if EN is high. For example, SNS will not measure load current if EN is low because there is no load current. However, there is no risk or concern about operating the device in this state.

    Thanks,

    Alec