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  • TI Thinks Resolved

AMC1100: Output is faulty when power on

Part Number: AMC1100

Hi,

Our customer is using AMC1100. When power on, the output voltage is abnormal occasionally. Sometimes the output voltage is bigger than normal and sometimes the output voltage is smaller than normal. The abnormal state will continue until switching off the chip.

So here are some questions:

1. What condition will cause this issue?

2. How to avoid this issue?

Thanks.

Kevin Xiong

  • Hi Kevin,

    Can you please provide some additional detail about this AMC1100 application? How is the device powered? What 'abnormal' voltages do you see? Can you provide a schematic for the AMC1100 portion of the board?

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    Hi Tom,

    Thank you for your reply.

    The power is OK and the schematic refers to the datasheet. I attach the input, output_normal and output_abnormal waveforms. Please review them. By the way, this issue occurs occasionally and after power-up again, it disappears.

    Any suggestions?

    Thanks.

    Kevin Xiong

  • In reply to Kevin Xiong:

    Hi Kevin,

    Is it just one AMC1100 behaving this way or multiple devices?  Can you get us the lot trace code from the topside of the package?

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    Hi Tom,
    There are several devices which have this issue. Our customer is tracking the lot code. After I get the lot code, I will decide if the FA is necessary.
    Could you please help ask the designer: Which condition will cause the output voltage abnormal?
    Thanks.
    Kevin Xiong
  • In reply to Kevin Xiong:

    Hi Kevin,

    I sent you an e-mail to your my.ti account, lets work this off line for the moment.  I'm closing this thread for the moment and will update with any pertinent detail that comes up.

     

    Regards,

    Tom

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