I am trying to design a DC-DC flyback converter.
Input voltage is 110V and output voltage is 24V. I have used NCP1252A PWM controller.
Flyback transformer windings:
Primary -> 24 turns
Secondary -> 12 turns
Aux -> 6 turns
Switching frequency is 470 kHz (for very small ferrite core)
When I tried to apply 110V, although the MOSFET is robust, gate signal is not created. I can not understand why it is not working. When I removed the MOSFET, the PWM controller created gate signal. Why?
I wonder if the transformer is in saturation. What happened when the flyback transformer is in saturation?
I can not understand how to calculate Rcomp resistor. I examined the NCP1252 datasheet and I calculated as 0R. (Because I am using lower duty cycle than 50%. As I understand We needn't it if using lower duty. But I'm not sure this info !!! This matter is explained at slope compensation section at the datasheet. NCP1252 datasheet
Circuit schematic is below [added in 23.07.2020]