I designed a SEPIC using the LT3467 with coupled inductors. It supply 17V starting from a 12V input. On the simulator (LTSPICE) everything works, but on the test board there is a problem. With 70mA output current there is a ripple of 1V (see pic attached) caused by the wrong regulation of the chip.
Do you have any idea on how can i make the switching node switch regularly? Maybe there is a problem on the feedback loop. I cannot post the pic of the schematic because i don't have enough reputation points, so if you need it you can tell me another way to post it.
In the link below you can find the schematic and the output node and the switching node with 200mA at the output.