LTC4226 Hot Swap Controller

Hi, I use Hot swap Controller LTC4226 for our system.

but I faced problem. During EMS(CS101) test, we confirmed that the ground of our system shakes and the GND of ltc4226 shakes at the same time.

When the GND of LTC4226 is shaken, I am curious about how it works, and in such a situation, I wonder if it is possible to cut off the power by operating the MOSFET even if overcurrent does not flow.

I also attach the circuit we use

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  • +1
    •  Analog Employees 
    on Mar 26, 2021 2:23 PM

    Hi,

    In the LTspice model that you shared the MOSFETs are being turned off because the ON1 and the ON2 signals are below ON pin threshold voltage 1.24V - 50mV hysteresis.

    To prevent them from turning off, you can add a filter capacitor in parallel with the 10k resistors R4 and R8. The demo board, DC1627A-A has a 47nF filter capacitors.

    Link: LTC4226 Datasheet and Product Info | Analog Devices

    Does this answer your question?

  • Hi, JayBee

    Thanks to your reply. I will edit my circuit for ON1 and the ON2 signal to prevent form turn off LTC4226.

    but i still have a question.

    I had a confirm signal that the LTC4226 GND pin shaking with Input power but ON1 and ON2 signal are upper threshold voltage during EMS(CS101)

    I know that  Two reason  LTC4226 is system power cut off.

    1. Over Current Situation

    2. ON1 and ON2 Signal are below threshold voltage

    but i guess other situation that When LTC4226 GND pin are shaking and cut off the output power.

    Is it true ? Or is there another reason?

Reply
  • Hi, JayBee

    Thanks to your reply. I will edit my circuit for ON1 and the ON2 signal to prevent form turn off LTC4226.

    but i still have a question.

    I had a confirm signal that the LTC4226 GND pin shaking with Input power but ON1 and ON2 signal are upper threshold voltage during EMS(CS101)

    I know that  Two reason  LTC4226 is system power cut off.

    1. Over Current Situation

    2. ON1 and ON2 Signal are below threshold voltage

    but i guess other situation that When LTC4226 GND pin are shaking and cut off the output power.

    Is it true ? Or is there another reason?

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