The maximum output power of TNY266G depends on the input voltage, output voltage, and the transformer turns ratio. However, as a general guideline, it can deliver up to 6.5 W of output power with a 12 V input and 5 V output.
To select the right transformer, you need to consider the input voltage, output voltage, and the desired output power. Power Integrations provides a transformer selection guide in their application notes. You can also use online tools or consult with a transformer manufacturer to find a suitable transformer.
The BYPASS pin is used to bypass the internal voltage regulator and connect an external voltage source to power the IC. This is useful when the input voltage is already regulated or when you want to use a different voltage regulator.
TNY266G does not have built-in OVP. However, you can implement OVP using an external voltage monitor IC or a zener diode connected to the output voltage. The voltage monitor IC can be connected to the SHUTDOWN pin to shut down the IC in case of an overvoltage condition.
The minimum input voltage required for TNY266G to operate is 10 V. However, the IC can start up with an input voltage as low as 8 V, but the output voltage regulation may not be guaranteed.