UCC28950 Green Phase-Shifted Controller

Texas Instruments' green phase-shifted, full-bridge controller with synchronous rectification

Texas Instruments' UCC28950 Green Phase-Shifted ControllerTexas Instruments' UCC28950 enhanced, phase-shifted controller builds upon Texas Instruments' industry standard UCCx895 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.

Features
  • 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/Off control with programmable threshold
    • Programmable adaptive delay
  • Average or peak current mode control with programmable slope compensation and voltage mode control
  • 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 under voltage lockout
Applications
  • Phase-shifted full-bridge converters
  • Server
  • Telecom power supplies
  • Industrial power systems
  • High-density power architectures
  • Solar inverters
  • Electric vehicles

UCC28950 Green Phase Shifted Controller

ImageManufacturer Part NumberDescriptionOutput TypeFunctionAvailable Quantity
UCC28950PWR datasheet linkIC REG CTRLR FULL-BRIDGE 24TSSOPUCC28950PWRIC REG CTRLR FULL-BRIDGE 24TSSOPTransistor DriverStep-Up/Step-Down3723 - Immediate
UCC28950PWR product page link

Evaluation Module

ImageManufacturer Part NumberDescriptionMain PurposeOutputs and TypePower - OutputAvailable Quantity
UCC28950EVM-442 datasheet linkEVAL MODULE FOR UCC28950-442UCC28950EVM-442EVAL MODULE FOR UCC28950-442DC/DC, Step Down1, Isolated600W4 - Immediate
68 - Factory Stock
UCC28950EVM-442 product page link
Published: 2011-08-25