FEATURES APPLICATIONS
• Phase-Shifted Full-Bridge Converters • Enhanced Wide Range Resonant Zero Voltage
Switching (ZVS) Capability • Server, Telecom Power Supplies
• Industrial Power Systems • Direct Synchronous Rectifier (SR) Control
• High-Density Power Architectures
• Light-Load Efficiency Management Including
• Solar Inverters, and Electric Vehicles
– Burst Mode Operation
– Discontinuous Conduction Mode (DCM),
DESCRIPTION
Dynamic SR On/Off Control with
Programmable Threshold The UCC28950 enhanced phase-shifted controller
builds upon Texas Instrument’s industry standard
– Programmable Adaptive Delay
UCCx895 phase-shifted controller family with
• Average or Peak Current Mode Control with
enhancements that offer best in class efficiency in
Programmable Slope Compensation and
today’s high performance power systems. The
Voltage Mode Control
UCC28950 implements advanced control of the
full-bridge along with active control of the
• Closed Loop Soft Start and Enable Function
synchronous rectifier output stage.
• Programmable Switching Frequency up to 1
MHz with Bi-Directional Synchronization The primary-side signals allow programmable delays
to ensure ZVS operation over wide-load current and
• (+/-3%) Cycle-by-Cycle Current Limit
input voltage range, while the load current naturally
Protection with Hiccup Mode Support
tunes the secondary-side synchronous rectifiers
• 150-μA Start-Up Current
switching delays, maximizing overall system
• V DD Under Voltage Lockout efficiency.
• Wide Temperature Range -40°C to 125°C
