Mokthar
Junior Member level 1
I designed a SMPS with 12v and 1 amps output. When i connect a dc bulb of load 12v 10W. The smps output oscillates (turns on and off) frequently for some time and then the output goes stable. what causes this problem. The pwm ic used here is TNY 278PN and feedback circuit with optocoupler and TL431.
How to overcome this? so that my smps output remains stable once it turned on without oscillating.
Schematic is attached here.View attachment SMPS Schematic.pdf
How to overcome this? so that my smps output remains stable once it turned on without oscillating.
Schematic is attached here.View attachment SMPS Schematic.pdf