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TPS1214Q1EVM: Overcurrent and Short-Circuit Protection

matsushita toshi
Prodigy 10 points
Part Number: TPS1214Q1EVM


Tool/software:

[Confirmation details]
① I want to know ISC value and variation of immediate shutdown.
② I want to know the variation of IOC
③ Current Consumption of TPS1214Q1
Conditions: at12V, 48 V

  • 0
    TI__Genius 10050 points

    Hi Toshi-san, 

    1. Isc is the configurable current threshold, RISCP is the value you select to configure it. 
    2. Again the IOC is the configurable over current threshold. Ioc_max is typically 5-10% below the ISC. 

    Thank you, 

    Sarah

  • 0 in reply to Sarah Raines
    Prodigy 10 points

    Thank you, Sarah

    I would like to ask again about 1.

    I want to know the calculation methods for RISCP or ISC.

    I understand 2 and 3.

  • 0 in reply to matsushita toshi
    TI__Genius 10050 points

    Hi Toshi-san, 

    For # 1. Isc is whatever current threshold you want to set for short circuit protection. 100A for example can be used in Eq 14 to calculate the needed RISCP value. 
    The maximum guaranteed time before the short circuit is recognized is 5us in active mode and 4.5us in LPM. It could be faster, but no slower. 

    Thanks,

    Sarah

  • +1 in reply to Sarah Raines
    Prodigy 10 points

    Hi Sarah-san,

    The IOC can be configured, and it can be converted using the formula below.

    IOC=(RISCP×ISCP+1.8)/RSNS

    I want to calculate the IOC value, but I cannot determine the IOC value because the RISCP value is unknown.

    Since there is a difference between the design value and the measured value, I want to calculate the design value.

    ISCP=25,RSNS=0.5m

  • 0 in reply to matsushita toshi
    TI__Genius 10050 points

    Hi Toshi-san, 

    These values are not constant. They are chosen based on customer needs. If a system needs to shut off at 130A then you use this value to select the correct RISCP to set this threshold. You must have an idea of the desired short circuit protection threshold in order to select RISCP....

    See below as a design example: 

    Thanks, 

    Sarah