SMPS Output voltaje slowly goes down
Hii,
I am a biomedical engineer, I not an specialist with smps, but I have to repair one that is not working properly.
It is a "CONDOR D.C. POWER SUPPLIES, INC." 32.5V 7.70A, SMPS.
At the beginning, there was no voltage at the output after pluging until like 10 minutes of being plugged, I changed all the caps but the high voltage one and i was still the same, then I replaced the uc2844 Current-Mode PWM Controller IC with a uc2845 ic and it worked, I finally had the output availble inmediately after pluging in.
After I replaced the components, the voltage output of my SMPS slowly decreases from 33v to something like 28v and then the outputs suddenly goes to 0v. If I unplug it for about 5min and plug it again, the output is 33v and starts goign down.
Is the problem of the smps that I didn´t replace the IC with an exact one? or is there another problem?, I already replaced the high voltage cap but it is still doing the same.
Thank you for all your time and support.
Sergio David Mercado Vera