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TPS2121: Question about short circuit protection

PYTsai
Genius 11645 points
Part Number: TPS2121

Hi 

Datasheet mentioned short circuit protection IOCP = 2.4* ILM

However below picture look like the output current is clamp at ILM 1.65A and did not reach IOCP = 2.4* ILM. 

How to explain the result below ?  

  • 0
    TI__Genius 10652 points

    Hi PYTsai, 

    This looks like a completely correct operation of TPS2121, it is limiting to the correct ILM value set by your 71.5k resistor.

    I think the reason you are not seeing the output jump to IOCP = 2.4* ILM could be due to the low sample rate the on scope is set to (100kS/s)

    The OCP protection actually reacts and limits the current back to ILM within <1us. The peak up to IOCP=2.4*ILM couldn't be captured by the scope if it is taking samples every 10us.

    Please increase sample rate of the scope in Acquire menu by increasing # of points to maybe 1M or larger for example, i think this should fix the issue. 

    Please let me know if this fixes your issue.

    Best

    Dimitri