I am trying the circuit which was in EP-91 report for 12V/12W power supply using TNY278PN. This circuit gives 12V at Noload condition. When connected with the load it is not working. And the MOSFET never switched On. I am using MUR460 instead of BYV28-200, and 1N4742 instead of BZX79-C11. Source to EN/UV pin voltage is 1.08V. I don't know why it is not working. Please Help.