Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification - UCC28950

UCC28950 (ACTIVE)

Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification

Description

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.

In addition, the UCC28950 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. A 90-degree phase-shifted interleaved synchronized operation can be easily arranged between two converters.

The UCC28950 is available in TSSOP-24 package.

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
  • Naturally Handles Pre-Biased Start Up with DCM Mode
  • 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

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Duty Cycle (Max) (%)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Regulated Outputs (#)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
UCC28950
Full-Bridge    
Current    
97    
1000    
6.75/6.15    
4    
Catalog    
-40 to 125    
24TSSOP    
3.15 | 1ku    

Other qualified versions of UCC28950

Version Part Number Definition
Automotive UCC28950-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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