The UCC28950PWR 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 UCC28950PWR 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 UCC28950PWR 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 UCC28950PWR 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 UCC28950PWR is available in TSSOP-24 package.
For all available packages, see the orderable addendum at the end of the datasheet.
Feature
Enhanced Wide Range Resonant Zero Voltage Switching (ZVS) Capability
Direct Synchronous Rectifier (SR) Control
Light-Load Efficiency Management Including
Burst Mode Operation
Discontinuous Conduction Mode (DCM), Dynamic SR On and Off Control with Programmable Threshold
Programmable Adaptive Delay
Average or Peak Current Mode Control With Programmable Slope Compensation and Voltage Mode Control
Naturally Handles Pre-Biased Start Up With DCM Mode
Closed Loop Soft Start and Enable Function
Programmable Switching Frequency up to 1 MHz with Bi-Directional Synchronization
(±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support
150-μA Start-Up Current
VDD Undervoltage Lockout
Wide Temperature Range –40°C to +125°C
Description
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.
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
