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Original question:

TPS2595: Short circuit test at Ilim=0.5A

TPS2595: Overvoltage Protection und Safe During Single Point of Failure

Alen Barisic
Intellectual 1300 points
Part Number: TPS2595

Hi,

my customer wants to use TPS2595 as an overvoltage protection for a 3.3V rail.

If one fault occurs, is it ensured that this does not affect the safety functions of the device? Or in other words, is it safe during single point of failure? If a fault occurs, is the output free of voltage?

Or does this Single Point of Failure Safety only refer  to the current limitation?

Thanks,

Alen

  • 0
    TI__Guru 57737 points

    Hi Alen,

    TPS2595 can handle voltages as high as 20V. The device will not allow the output to see over voltages at the input by turning off the FET or  clamping the voltage.

    • TPS259520DSG clamps the output voltage to around 3.8V as long as it can before hitting Thermal Shutdown.
    • TPS259573DSG can be used to set a OVLO threshold and the device turns OFF the FET if the input voltage goes above the set value.

    What do you mean by single point failure ? This device protects the output from overload even if its ILIM pin shorts to GND or OPEN. 

    As long as the device is operated within its rated voltage the efuse protects the load from over current, short circuit and Over voltage faults. 

  • 0 in reply to Praveen GD
    TI__Intellectual 1300 points

    Hi Praveen,

    thanks for your input!

    The datasheet mentions at 1. Features:

    Safe During Single Point Failure Test (IEC62368-1) – ILM Pin Open/Short Detection

    We are interpreting this as, even if a fault in the device occurs, the current limiting is not affected.

    Does this also apply for the overvoltage protection (if a fault in the device occurs)?

    We need to make sure one single fault does not affect the safety functions of the device (in this case the overvoltage protection).

    Thanks,

    Alen

  • 0 in reply to Alen Barisic
    TI__Guru 57737 points

    Hi Alen,

    The main functionality for eFuse device is current limiting. The Single point failure mentioned in the datasheet only refers to the ILM pin and current limit functionality.

    In case you are considering TPS259520DSG , there is no external component which can effect the overvoltage functionality of the IC. This is because the over voltage clamp threshold is a fixed internally to 3.8V.  As long as you operate the IC within its recommended operating conditions we do guarantee the OV protection feature.