The UCC28951-Q1 device is a new enhanced version of the UCC28950-Q1; it is a fully compatible drop-in replacement for the UCC28950-Q1. Reference application note Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 (SLUA853) for choosing the controller to best fit your application. The UCC28951-Q1 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, maximizing overall system efficiency.
The UCC28951-Q1 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, the UCC28951-Q1 includes support for current or voltage mode control. Programmable switching frequency up to 1 MHz and a wide set of protection features including cycle-by-cycle current limit, UVLO, and thermal shutdown.
The UCC28951-Q1 is available in 24-pin TSSOP package and is RoHS compliant.