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TPS2491: SOA of external FET

Part Number: TPS2491

Hi

We are going to use TPS2491 with the following condition.

(Vin=24V , Iload= up to 3A(typ)) --> Rs=15mohm, CT=0.1uF

 External FET : RSD100N10

Should we set the power limit if we need to be concerned SOA of FET? (The current limit only needs but also the power limit needs?)

We had tried to evaluate TPS2491 with above conditions and no power limit(PROG is connected to VREF via 47kohm.).

However it does not work under SOA of FET.

Regards,

Koji Hamamoto 

  • Hi Hamamoto-san,

    The power limit setting is used for a SOA protection setting for the external FET. It’s used in designs to make sure that the FET doesn’t fry during startup when charging the output capacitance.

    The best way to figure out if a particular design will work with one of our hotswap controllers is to fill out our design calculator tool with this device and attach. This will help review and troubleshoot your design, and would greatly speed up the back-forth communication of questions we would have for information needed for the review (such as total output cap including anything connected downstream from the output node, which may not be shown on a partial schematic).

    You can find it by going to www.ti.com/hotswap ==> click on “Tools & software” ==> then click on “Hot Swap design calculator tools”

    For help on filling out the excel spreadsheet, we have video tutorials. They explain how to enter the correct values cell by cell. Please watch the videos at www.ti.com/hotswap ==> Click on “Support & Training” tab.

    Best Regards,
    Aramis P. Alvarez