Hi We are using ADL5545 in very harsh electromagnetic environment (High voltage substations).

 Question is: as the device is supplied through the output via a shock coil, what is the negative transient voltage that could be acceptable  to the output terminal? This could occurred if the power supply is not perfectly designed regarding EMC management. Then oscillations of the shock coil could create such negative swings.

Thank you

Jean Pierre

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  • +1
    •  Analog Employees 
    on Jul 28, 2020 5:16 PM 8 months ago

     Hi Jean Pierre,

                             This is tough, This is something we've never looked at previously. I'm not sure exactly how to find the correct solution.

    Regards,

    Jim B                            

  • Thanks for searching, Jim

    With other words, could the E pHEMT process induce some weakness in the components? Anyway, we will not connect the supplying shock coil directly to the component. We will insert a set of diodes (*) to prevent any negative voltage at the output.

    Thanks again

    Regards

    Jean Pierre

    * set of diodes:

    one with the anode on the coil side, the cathode to the amplifier terminal

    one with the cathode on the coil side, the anode on the ground

Reply
  • Thanks for searching, Jim

    With other words, could the E pHEMT process induce some weakness in the components? Anyway, we will not connect the supplying shock coil directly to the component. We will insert a set of diodes (*) to prevent any negative voltage at the output.

    Thanks again

    Regards

    Jean Pierre

    * set of diodes:

    one with the anode on the coil side, the cathode to the amplifier terminal

    one with the cathode on the coil side, the anode on the ground

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