The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s industry
standard UCx895 phase-shifted controller family with enhancements that offer best in class
efficiency in today’s high performance power systems. The UCC28950 implements advanced control of
the full-bridge along with active control of the synchronous rectifier output stage.
The primary-side signals allow programmable delays to ensure ZVS operation over wide-load
current and input voltage range, while the load current naturally tunes the secondary-side
synchronous rectifiers switching delays, maximizing overall system efficiency.
The UCC28950 also 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, ensuring ZVS operation is extended down to much lighter loads.
In addition, the UCC28950 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. A 90-degree phase-shifted interleaved
synchronized operation can be easily arranged between two converters.
The UCC28950 is available in TSSOP-24 package.
For all available packages, see the orderable addendum at the
end of the datasheet.
View datasheet View product folder