I plan to use the Lnk304 in a non-isolated configuration as describe in the datasheet with 10V output in parallel with another DC supply at 15V. In other words, the capacitor for 10V and for 15V are the same. so, while the other supply is in function, the Lnk304 doesn't have an input anymore and the 15V is seen at his output. I have tested this configuration and it works fine. Does PI engineer see any problem of using this configuration for mass production.