Hello,
The UCC28951 phase shifted full bridge is generally for design where high power (800W+) and efficiency is required of 90% or greeter.
For a 250W solution the most popular is a two switch forwarded. This can be achieved with the UC28C42 that an on board amplifier for feedback.
The following will bring you to link with the UCC8C42 product folder; as well as, design tools. If you decide to use this device, please repost with the UC28C42 in the thread title so the appropriate engineer can looking into your questions regarding this device. 
Regards,
Hello Aaron,
You can use the UCC28C42 in a two switch forwarded with 1 to 2 gate drive transformer. Figure 29 in the data sheet shows how to use the UCC28C42 in a single switch forwarded converter and this application can be used up to 300 W and only requires one switch. However, customers have used the UC28C42 in two switch forwarded converters for 250 W ATX power supplies in the past. I checked but I don't have any schematics, I can share with you. However, I can give you and the TI applications engineer some guidance on how to drive a two switch forward with a single output driver using the UC28C42.
There is an older TI device the UCC28500 which is a PFC two switch forwarded controller. You don't need this controller for your design. However, go to figure 9 for an example of how to drive a two switch forwarded with a single output using a gate drive transformer. The components you are interested in are C5, C4, D2, T2 T2, R1, R2, Q1. The two switch forwarded converter single driver in the UCC28500 has similar drive current to the UCC28C42. Both of these devices can use a single output to drive a gate drive transformer.
Capacitor C5 is DC blocking capacitor and C4 is DC restore. This capacitor is generally around 1 uF and needs to be sized for the peak driver current of 1 A.
Regards,
