This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • Resolved

AMC1311: AMC1311 drop output characteristics

Part Number: AMC1311

AMC1311 instead of ACPL-C87AT test, sampling precision, high and low temperature performance test has been completed, little difference, but the output characteristics in the working voltage range when the exit is different, accessories for the AMC1311 and C87AT output waveform in the respective exit point voltage of which is 5V voltage, blue, green as the output voltage of AMC1311 and C87AT, sampling for the power supply voltage of 24V, yellow is a 393 output voltage comparator, when AMC1311 (C87AT) reference voltage output voltage is higher than a 1.5V, 393 output high level, lower than 1.5V, 393 output low level, from the two picture it can be seen that when the 5V voltage is lower than 4.5V (picture in Y axis intersection position and blue dotted line), AMC1311 and C87AT do not work, but the output voltage of the C87AT directly dropped, and the output of AMC1311 The voltage was upwards (higher than the reference 1.5V) and then dropped, causing my 393 comparator to misoperate. What is the cause of the burr?

  • Hi Shuang,

    I believe what you are seeing is the AMC1311 going into 'fail safe' mode.  Please refer to section 8.3.3 of the AMC1311 datasheet.  Is the blue 5V trace for the power to VDD1 or VDD2?  

     

    Regards,

    Tom

  • In reply to Tom Hendrick:

    The blue 5V trace for the power to VDD1. But the VDD1UV is 2.53V, the burr happened in VDD1 fall to 4.5V. What cause fail-safe output active?
  • In reply to shuang Cao:

    Hi Shuang,

    Very interesting! I noticed that trace 2, loooks like it is a bipolar signal. How do you have the output of the AMC1311 setup? Do you have a differential to SE output stage behind the AMC1311? Can you share your schematic?

     

    Regards,

    Tom

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.