aksnis Posted October 6, 2020 Report Share Posted October 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 Quote Link to comment Share on other sites More sharing options...
HarryA Posted October 6, 2020 Report Share Posted October 6, 2020 I would disconnect one end of R35 and see if that fixes the problem or just replace it. It maybe breaking down under the higher voltage? Quote Link to comment Share on other sites More sharing options...
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