Engineering Prototype Report for EP-91 – 12 W Power Supply using TinySwitch®-III (TNY278P)

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Dear Engineers,

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.


Could you please send us your schematic, PCB layout, transformer construnction document and PIExpert/PIxls design.