we are designing 30W (30V,1A) following DER286 (capacitor design) ,
but when we short 2 output pin, the IC does not shutdown to protect LED load, the output current is still=3A. all components value are same and in DER286. only transformer change to EER28 core instead of PQ26/25 in DER286.
Any expert can advise reason and solution for the short-circuit problem.