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TPS1H100-Q1 - Version B - Current Limit

Christoph Klees
Prodigy 220 points

Hy,

I have a problem with the current Limit function.

I connect a variable resistive load to the Output and increase the current step by step, my Limit is about 900mA (Rcl = 2k7).

My start is at 200mA and I measure the voltage at the "CL" Pin of the TPS1H100.

The voltage at the "CL" still increase until 1.2V is reached. Now I reduce the load and the switch llimit the current. After some time the Switch start to toggle, I think the maxi junction temperature is reached.

That's all okay, but after a few seconds the Switch stop toggling, the voltage at the "CL" Output is 0V and the Switch doesn't Limit the current.

I have to restart the Switch

What happens inside the Switch ?

 

Kind regards,

Christoph

 

  • 0
    TI__Genius 15780 points

    Hi Christoph,

    I have contacted the engineer responsible for this device and he will answer your question soon.

    Thanks,

    Alek Kaknevicius

  • 0
    TI__Intellectual 1150 points
    Hi, Christoph,

    I'm the contact for this part.
    Can we talk through the E-mail? My mailbox: alex.wang@ti.com
    We'll try to help you as much as possible.

    Regards,
    Alex,
  • 0 in reply to Alex Wang (LED)
    Prodigy 20 points

    Hi,
    I plan to use this part.
    What's the answer for the behavior ?

    I have an another question: I plan to use it with a 3.3V MCU.

    For the CS pin, in the datasheet it seems that it's a current output, but for the fault conditions it's current driven or voltage driven ?

    If it's current driven output, the output are 0-8mA for nominal current, and 10mA for faulty current ?

    If it is true, the CS output voltage could be adjusted to 0-3V for nominal current, 3.3V for faulty current with the good resistor value ?

    Thanks.

  • 0 in reply to philippe leray
    TI__Intellectual 1150 points
    Philippe,

    Regarding to the below behavior, we found the root cause and fixed it. We can communicate more on this through email, if you have further interest, alex.wang@ti.com

    When fault condition, it's current driven with volatge clamp. 10mA is the minimum value, typical value is larger, so it's NOT recommened as your idea.
    We suggest you to use a reisitor that the linear current sense range is 0-3V, also guarantee fault voltage >4.3V when minimum 10mA current. Then, a zenor clamping the CS fault volatge within 3.3V MCU limit.

    Regards,
    Alex,