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


Product details


Topology Phase-Shifted Full-Bridge Control method Current VCC (Min) (V) 8 VCC (Max) (V) 17 Duty cycle (Max) (%) 97 UVLO thresholds on/off (V) 7.3/6.7 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 105, -40 to 125 Gate drive (Typ) (A) 0.2 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Light Load Efficiency, SR Logic, Soft Start, Soft Switching Rating Automotive open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

TSSOP (PW) 24 34 mm² 7.7 x 4.4 open-in-new Find other PWM controllers & resonant controllers


  • 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
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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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Exact equivalent in functionality and parametrics to the compared device:
UCC28951-Q1 ACTIVE Automotive green phase-shifted full-bridge controller with SR control for wide input voltage range This product is a performance improvement over UCC28019.

Technical documentation

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Type Title Date
* Datasheet UCC28950-Q1, Green Phase-Shifted Full-Bridge Controller with Synchronous Rectif datasheet (Rev. B) Sep. 15, 2012
Application notes Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 Nov. 13, 2017
More literature Design review of a 2-kW parallelable power supply module Aug. 17, 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) Aug. 17, 2016
User guides 600-W, Phase-Shifted, Full-Bridge Converter (Rev. A) May 19, 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The UCC28950EVM-442 is a 600-W phase-shifted full-bridge converter that converts a 370 V to 410-V DC input to a regulated 12-V output. This converter was designed to maintain ZVS down to 50% load. This 600-W EVM was designed to demonstrate how the UCC28950 control device could be used in (...)

  • ZVS from 50% to 100% load
  • Higher Efficiency for 80 + Applications
  • Burst Mode/DCM Function to Reduce No-Load Power Dissipation to Meet Green-Mode Requirements

Design tools & simulation

SLUC210D.ZIP (1328 KB)
SLUC222D.ZIP (184 KB)

CAD/CAE symbols

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TSSOP (PW) 24 View options

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