Constant current boost converter problems

[Mordred]

I recommend we isolate the lamp with a close resistor load, measure the load on initial lamp start up as it will, I would think drop once its fully on. Then try a potentiometer on the load side and check the signal behavior. If the behavior improves then we can look into a means to regulate it. If it doesn't improve then we know were still configured wrong on the 494

 

[Artlav]

Are above traces with lamp load or resistor load?
What is the yellow trace now - current through load or voltage across output capacitor?

5Ω resistive load.
The traces are across current feedback output - 20:1 amp of current across 0.01Ω sense resistor, with RC filter of 100Ω and 0.1μF.

So - what region of your closed loop has a response time around a half millisecond?

The ignitor transformer?
It's 200μH worth of choke in series with the load.


All in all, I'm likely to give up on this design, and try a CV boost followed by CC buck instead.
So, thanks all for help.