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UC3825A based smps troubleshoot

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Discussion in 'Power Electronics' started by aksnis, Oct 6, 2020.

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  1. Oct 6, 2020 #1
    aksnis

    aksnis

    1
    0
    Oct 6, 2020
    Hello

    I am trying to repair a smps power supply based on UC3825A

    Problem is the resistor R49 & R34 get burst as soon as i start the smps

    I am not able to find out the issue

    SYS_ECON is a 0-5v given from MCU desired by user to control 0-180v smps output
     

    Attached Files:

  2. Oct 6, 2020 #2
    Bluejets

    Bluejets

    4,756
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    Oct 5, 2014
    Have you checked the value of R35 ..?
     
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