Other Parts Discussed in Thread: LM5155
For the application of flyback, the primary side output(VPRI_5V0) current load will influence the second side output voltage VISO_P18V,VISO_N5V,VISO_12V0,VISO_5V0_REF.
The output voltage of second side will rise a lot when the primary side load rise.
The second side voltage rise bring the problem that the reference supply and zenor diode(in red circle) on the second side's temperature rise a lot.
Is this phenomenon the cross regulation? How can we handle this issue?