We have a product designed in 2002 using a TinySwitch generation II device (TNY267G) to make an 90-260 Vac input open frame/on a pc board 10 W isolated flyback power supply. We are updating this board for other reasons and while doing those updates we thought we would update to a newer power supply IC to avoid potential future obsolescence of the old part. From looking at the Power Integrations web site it looks like the TinySwitch generation 4 devices are the ones to use. Specifically for our supply it looks like we should use the TNY286D device.
In comparing data sheets for TNY267G and TNY286D it looks like the newer part has all the same functionality/operational characteristics of the older part except for a different pinout in the SO-8C package.
Our questions are:
1. Is TNY286D the right new part to replace TNY267G?
2. Other than pinout changes are there any other changes we should make to use TinSwitch-4 instead of TinySwitch-II?
3. Will we see any differences in the radiated EMI signature with the newer part compared to the old? For example, is the newer part faster and have higher dV/dt potentially causing more radiated energy?
4. Is there an app note about up grading from older to newer TinySwitch parts that we somehow missed?
To help be more specific I have attached our one page schematic for the existing supply using the TNY267G.