I designed a AC/DC with a LNK3205
This regulator generate a voltage 12VDC. It supplies a DCDC to generate 3,3V for a microcontroller and a relays.
Every thing works correctly but I have an issue durin the relays switching : there is an high ripple during the switching.
The current consumption is about 90mA
Added file show schematics and ripple.
I don't find the reason of this ripple.
Can I have some help ?