Full Member level 4
Yes, also, i think the datasheet of LT124X does say that LT124X are pin for pin compatible with uc384x series.
I think the UCC38c4x series is also the same but draws less bias current, so you may prefer it.
Remember also you only need the 50% duty one as its 2TFC.
There is also the NCP12XX series which may do the trick.
Thats good news. I am gonna try to simulate with LTSpice. Yea i know, in 2T forward, above 50% duty cycle must be avoided in order not to saturate the main transformer. Thats why also i used UC3844 giving 50% duty cycle at most. I have taken 40% duty cycle at most in transformer calculations. Yea there are many alternatives for pwm and pfc ics but the problem is that we can not find them easily here. So i did select the common ones.