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TPS2660: Electronic circuit breaker/Active current limiting

Shota Mago
Expert 7570 points
Part Number: TPS2660

Hi team,

I'm an FAE supporting some industrial companies in Japan.

My customer will employ TPS2660 and provided some questions.

  1. What is the difference of "Electronic circuit breaker with auto-retry" and "Active current limiting with auto-retry"?
  2. Could you please explain "xxx with latch-off"?
    (How does it work?)

 Although I read datasheet, I'm still not clear.

I'm looking forward to hearing back from you.

Best regards,

Shota Mago

  • 0
    TI__Expert 7570 points
    Hi team,

    Could someone reply on this?

    Best regards,
    Shota Mago
  • 0 in reply to Shota Mago
    TI__Genius 16305 points

    Hi Shota,

    Basic difference between circuit breaker and current limit is that the way the TPS2660 behaves during an overload (over current) scenario.

    In circuit breaker, after an over current the TPS2660 turns off the internal MOSFET so that the output is cut off from input.

    If the circuit breaker is configured for auto retry, the TPS2660 will attemp to turn internal MOSFETs back ON after 512ms. If the over current fault is removed within the 512ms, output comes back up. If the over current fault persists for longer, the TPS2660 will attempt to retry every 512ms.

    If the circuit breaker is configure for latch off, the TPS2660 will turn off the internal MOSFETs after an over current event and will need to reset to come back up either by power cycling the input or using the SHDNb pin.

    In current limit, after an over current the TPS2660 limits the current to programmed value. Because the current is limited, its output voltage drops down depending the over load current. Now because there is voltage difference across TPS2660 input and output and the current limit, power is dissipated across the internal MOSFETs of TPSP2660.

    The auto retry and latch off behavior is similar to circuit breaker, here instead turning off the MOSFETs, current is limited with auto-retry and latch-off.

    Please refer to the attached document for TPS2660 behavior during current limit and circuit breaker.

    4774.Thermal_Stress_in_TPS2660_eFuse.pdf

    Regards,

    Kari.

  • 0 in reply to Karikalan Selvaraj
    TI__Expert 7570 points
    Hi Kari-san

    Thanks a lot for detail explanation!
    But still I can't imagine operation of auto-retry and latch-off of current limit, because the switch has been turned ON during current limit.

    Could you please a little bit clarify operation of auto-retry and latch-off of current limit?

    Best regards,
    Shota Mago
  • 0 in reply to Shota Mago
    TI__Genius 16305 points
    Hello Shota Mago,

    In current limit mode, when the load is increased from nominal load to beyond programmed current limit value, TPS2660 will try to limit the current to programmed value. However output voltage would go down and not stay at level as VIN.
    How much output voltage goes down, will depend on the over load current drawn.


    Regards,
    Kari.