Phase-shifted full-bridge controller for wide input-voltage range applications

The Texas Instruments UCC28951-Q1 enhanced phase-shifted full bridge controller builds upon their industry standard UCx895 controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The device implements advanced control of the full-bridge along with active control of the synchronous rectifier (SR) output stage. Programmable delays ensure ZVS operation over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side SRs, maximising overall system efficiency. The device offers multiple light-load management features including burst mode and dynamic SR on/off control when transitioning in and out of Discontinuous Current Mode (DCM) operation. In addition, it includes support for current or voltage mode control. Programmable switching frequency up to 1MHz and a wide set of protection features including cycle-by-cycle current limit, UVLO and thermal shutdown. The device is available in TSSOP-24 package and is RoHS compliant.