Dear Colleagues,
I am currently in a process of sketching a suitable solution for switching mode PSU with +250V 100mA DC and +12.3 V 3A DC outputs. One of potentially suitable options is based upon NCP1337 chip, however, the problem is calculation of the transformer. I looked through the app. note, (AND8246-D) but it refers to readymade TDK SRW42-15EC, which is not suitable for our needs. Any suggestions on this topic?
Many thanks for your time,
Andrey