There in an instability in 12-1A output of SMPS.
With AC input 230V, +5V – 1A output was stable whereas the +12V – 1A output was not stable in NO LOAD condition.
In Load Condition where
Load = 12V – 600mA DC Motor was used as load.
+15V – 1A dropped drastically with load voltage dropping to +8.8V, whereas +5V – 1A output was stable in those load condition
Every thing was designed as per PI integration suit simulation, but still I face such problem.
Is there any mistake in my design ?
Could you suggest any better design/schematic with transformer constructional details using (TNY Switch III) especially using (TNY280PN).