UCC28950-Q1（Phase- Shifted Full-Bridge Controller With Synchronous Rectification）IntroductionThe UCC28950-Q1 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-Q1 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 ranges, while the load current naturally tunes the secondary-side switching delays of the synchronous rectifiers, maximizing overall system efficiency.FeatureQualified for Automotive ApplicationsAEC-Q100 Qualified With the Following Results: -Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range -Device HBM ESD Classification Level H2 -Device CDM ESD Classification Level C3BEnhanced Wide-Range Resonant Zero-Voltage Switching (ZVS) CapabilityDirect Synchronous Rectifier (SR) ControlLight-Load Efficiency Management Including -Burst Mode Operation -Discontinuous Conduction Mode (DCM),Dynamic SR On/Off Control With Programmable Threshold -Programmable Adaptive DelayAverage- or Peak-Current Mode Control With Programmable Slope Compensation and Voltage-Mode ControlClosed-Loop Soft-Start and Enable FunctionProgrammable Switching Frequency up to 1 MHz with Bidirectional Synchronization(±3%) Cycle-by-Cycle Current Limit Protection With Hiccup Mode Support150μA Start-Up CurrentVDD Undervoltage I ockoutWide Temperature Range, -40°C to 125°C Appearance
