说明

The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s 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.

特性

• 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
• Wide Temperature Range –40°C to 125°C
• APPLICATIONS
  • Phase-Shifted Full-Bridge Converters
  • Server, Telecom Power Supplies
  • Industrial Power Systems
  • High-Density Power Architectures
  • Solar Inverters, and Electric Vehicles