Tool/software:
hello,ti engineer,
we are now use ucc256610 for our new design,but we find that we have a mode that neither lf burst mode nor hf burst ,here is the wave ,but when the input voltage drop to 210ac it is okey,also we want to know how to set the max frequency,thank you 
the input voltage 190vac-264vac,the min voltage is 230vdc, we ues auto double for input ,the output is 84v 1000W（ 1000W just for 50ms continue power is 200w ）we use ER40(Integrated transformer) for our design,now the ratio is 11:6 and the lk=9u Lm=45u,can you help calculate a feasible transformer for us，
also we face a problem ,when load 8a,it is okey for the first 200ms but suddenly the current rise up ,then the output drops ,does it enter to the Zero Current Switching (ZCS) Protection
