Hello, This is jaeyup
Currently, we are experimenting without using Boost Follower Circuit (Q4, R14).
When AC input voltage was applied, 390V operation (no load 0A) was operated without any problem.
However, the temperature of NTC did not decrease, but continued to increase. So the load could not be increased.
I would like to find an alternative to the phenomenon that NTC's temperature continues to rise.
Thank you..
Best regard