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TPS25925: What would TPS25925 act when over-current happen

Joy Yu
Prodigy 40 points
Part Number: TPS25925

Our requirement is as below.

Input: 5V (for USB)

output: 5V (for USB)

Maximum power out: 20W

When the output ask more than 20W, the IC stable output 5V/4A, not shutdown.

Is TPS25925 ideal for this application?

  • +1
    TI__Guru 50335 points

    Hi Joy,

    Let me explain how eFuse device work. It has a current limit feature . You will set current limit to a particular value . In your case let us say 4A. When the load will try to draw a current greater than 2A  then eFuse device will adjust its impedance and try to maintain current though it to 4A. Now when eFuse is in current limit , output voltage will fall(<5V) because eFuse has increased impedance to limit current . So power dissipation will be less than 20V. 

    eFuse device also has a  short circuit threshold which is generally around 2*current limit threshold for different efuses. So when current goes above 2*4=8A device will turn off very fast and then start again quickly to limit current to 4A(in us time ).

    I would recommend to use latest devices TPS259470,TPS259472.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Guru 50335 points

    Hi Joy,

    Any other concern? Can we close this thread?

    Regards

    Kunal Goel

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