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LM25066: current limit and circuit breaker difference

Betty Guo
Expert 7300 points
Part Number: LM25066

Hi,

customer have question about the difference between current limit and circuit breaker.

they need to set bus overcurrent production, once over current, turn off the MOS, if the current go to normal, turn on the MOS.

my understaning is the current limit is to limit current, can't off output, right?

I recommend customer use circuit breaker as OCP threshold, could you help double confrim and give your suggestion?

thank you

  • 0
    TI__Guru 57737 points

    Hi Betty,

    Current limit is the value to which the Hotswap controller limits the current during startup by controlling the Gate of the FET.

    During steady state, if the load current value goes above the set current limit (but less than the circuit breaker threshold), the hotswap allows the current to pass for the timer duration and then turns OFF the FET.

    If the load current goes above Circuit breaker threshold, the FET's are turned OFF immediately. 

  • 0 in reply to Praveen GD
    TI__Guru 57737 points

    Hi Betty,

    Hope your queries are answered. Please let us know if you have more questions.