UCC28950QPWRQ1 - Automotive 8V to 20V full-bridge, phase-shifted PWM controller with synchronous rectification

Features for the UCC28950-Q1

• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
  • Device Temperature Grade 1: –40ºC to 125ºC Ambient
    Operating Temperature Range
  • Device HBM ESD Classification Level H2
  • Device CDM ESD Classification Level C3B
• 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 Bidirectional 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 for the UCC28950-Q1

The 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.

The UCC28950-Q1 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-Q1 includes support for peak current along with 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. It is easy to arrange 90-degree phase-shifted interleaved synchronized operation between two converters.

The UCC28950-Q1 is available in a TSSOP-24 package.

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