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TPS2595: TPS259540DSG response time calculation

Carlo
Expert 7715 points
Part Number: TPS2595


Hello team,

How to calculate the response time of TPS259540DSG depending on the established current limit?  Our customer wants to know how long will it take the eFuse to enter in the thermal shutdown mode with the following parameters: Vin = 12.5 V, current limit: 2 A, and a continuous overcurrent of 2.5 A for example. Those values are only an example, the main concern is to know how to estimate it.

Regards,
Carlo

  • 0
    TI__Guru* 79181 points

    Hi Carlo,

    Thanks for reaching out. First thing would be the type of load. Let us assume CR load. So for 2.5A , load=12.5/2.5=5ohm. VOUT during current limit=2A*5ohm=10V. 

    Power dissipation across device = (VIN-VOUT)*ILIM=(12-10)*2=4W.

    Now we have to refer power vs time to thermal shutdown plot in datasheet. The y axis shows the time device will take to thermal shutdown at a particular power dissipation value.

     

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Expert 7715 points

    Hello Kunal,

    Does it mean that the device would take 10.000 ms to enter the thermal shutdown mode in a normal application with a temperature of 25 degrees?

    Regards,
    Carlo

  • +1 in reply to Carlo
    TI__Guru* 79181 points

    Hi Carlo,

    For 4W power I calculated in earlier thread , it is time more than 10s.

    Regards

    Kunal Goel