PMP7453 is a 220V-400VDC, 28V, 3.6A active clamp forward reference design that is very close to you provided specs. You can search the online database of TI reference designs and find other options as well. Thanks for connecting through E2E…
For 110V DC Input, a power converter would be required at input of TPS2663.
For 70W power: you can consider reference design PMP30631.1
For 100W power, you can consider reference design PMP7453 .
The circuit described in App note :…
You can use an emitter follower circuit with a zener tied to the base to limit the maximum voltage on the Vin pin. For reference, take a look at PMP7453: www.ti.com/.../PMP7453
The UCC2897A controller has a max Vin of 110V. In order to work…