Since the controller is on the secondary side and the system needs isolation from the primary side for safety, an isolated MOSFET driver UCC21320 can be used for this application. The specifications like 3.75kVRMS isolated voltage and 4A /6A source or sink current capacity makes UCC21320 designed for fit for this application. The typical circuit for UCC21320 is also shown in Figure 3-4. For detailed information, please refer to the data sheet of UCC21320.

For improving the converter efficiency and mitigating thermal issues, a synchronous rectifier was proposed in this application. UCC27524 was proposed to drive a rectifier MOSFET in the secondary side. ±5A sourcing and sink current capacity plus digital controller makes UCC27524 a good design for this application.