Hi. I would like to do a dc-dc converter which have output voltage equals to 12V and current is between 1.1A and 100mA. But, the input voltage is around 385V which is the voltage output of the PFC part. Since the voltage into the buck converter is so large, I would like to make a forward converter. But, I don't know which IC should be used and I have tried UC3844. Does anyone would like to give a suggestions or the design steps to me? Thank you.