Product details

Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 95 Vin (Max) (V) 17 UVLO thresholds on/off (V) 7.3/6.75 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Light Load Efficiency, SR Logic, Soft Start, Soft Switching Operating temperature range (C) -40 to 125 Switching frequency (Max) (kHz) 1000 Rating Catalog Gate drive (Typ) (A) 0.2
Topology Phase-Shifted Full-Bridge Duty cycle (Max) (%) 95 Vin (Max) (V) 17 UVLO thresholds on/off (V) 7.3/6.75 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Light Load Efficiency, SR Logic, Soft Start, Soft Switching Operating temperature range (C) -40 to 125 Switching frequency (Max) (kHz) 1000 Rating Catalog Gate drive (Typ) (A) 0.2
TSSOP (PW) 24 34 mm² 7.7 x 4.4
  • 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 and 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 Undervoltage Lockout
  • Wide Temperature Range –40°C to +125°C
  • 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 and 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 Undervoltage Lockout
  • Wide Temperature Range –40°C to +125°C

The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s industry standard UCx895 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 current or 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.

For all available packages, see the orderable addendum at the end of the datasheet.

The UCC28950 enhanced phase-shifted controller builds upon Texas Instrument’s industry standard UCx895 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 current or 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.

For all available packages, see the orderable addendum at the end of the datasheet.

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Technical documentation

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Type Title Date
* Data sheet UCC28950 Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification datasheet (Rev. D) PDF | HTML 04 Nov 2016
Application note UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) PDF | HTML 04 Mar 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Gate Driver Design Considerations 10 Oct 2016
Technical article Staying cool, efficiently 22 Aug 2016
More literature Design review of a 2-kW parallelable power supply module 17 Aug 2016
More literature Design review of a 2-kW parallelable power supply module (PPT) 17 Aug 2016
EVM User's guide Using the UCC27714EVM-551 (Rev. A) 14 Sep 2015
White paper Advancing Power Supply Solutions Through the Promise of GaN 24 Feb 2015
Technical article MHz isolated power supply - we are at the inflection point 14 Dec 2013
More literature Design Review of a Full-Featured 350-W Offline Power Converter 29 Oct 2013
Application note Frequency Dithering With the UCC28950 and TLV3201 09 May 2012
Application note Synchronizing Three or More UCC28950 Phase-Shifted, Full-Bridge Controllers 13 Sep 2011
Application note Pre-biased Output Voltage Startup Operation of the UCC28950 01 Aug 2011
More literature Журнал по применению аналоговых компонентов 3кв. 2010 13 Jan 2011
Analog Design Journal 3Q 2010 Issue Analog Applications Journal 11 Aug 2010
Analog Design Journal Computing power going “Platinum” 11 Aug 2010
EVM User's guide 600-W, Phase-Shifted, Full-Bridge Converter (Rev. A) 19 May 2010
More literature Seminar 800 Topic 5 - Fixed-Frequency Resonant-Switched PWM 15 Feb 2001
More literature Seminar 900 Topic 3 - Designing a Phase-Shifted ZVT Power Converter 15 Feb 2001
More literature Seminar 900 Topic 4 - 500-W 40-W/in3 Phase-Shifted ZVT Power Converter 15 Feb 2001

Design & development

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

Evaluation board

UCC27714EVM-551 — UCC27714 600W Phase Shifted Full Bridge Converter Evaluation Module

This 600W EVM was designed to demonstrate how the UCC28950 control IC, UCC27524A and UCC27714 gate drivers could be used in a phase shifted full bridge converter that achieves ZVS from 50 to 100% load. 

User guide: PDF
Not available on TI.com
Simulation model

UCC28950 and UCC28951 PSpice Transient Model (Rev. B)

SLUM169B.ZIP (153 KB) - PSpice Model
Simulation model

UCC28950 and UCC28951 TINA-TI Startup Reference Design (Rev. A)

SLUM276A.TSC (738 KB) - TINA-TI Reference Design
Simulation model

UCC28950 and UCC28951 TINA-TI Steady State Reference Design (Rev. A)

SLUM277A.TSC (739 KB) - TINA-TI Reference Design
Simulation model

UCC28950 and UCC28951 TINA-TI Transient Spice Model (Rev. A)

SLUM278A.ZIP (98 KB) - TINA-TI Spice Model
Calculation tool

UCC28950 MathCAD Design Tool (Rev. D)

SLUC210D.ZIP (1328 KB)
Calculation tool

UCC28950 Excel Design Tool (Rev. D)

SLUC222D.ZIP (184 KB)
Schematic

HPA442B Gerber Files

SLUR038.ZIP (292 KB)
Schematic

UCC28950 HPA471 Gerbers

SLUR039.ZIP (208 KB)
Reference designs

PMP7246 — 36-60Vin, 350W Slow Drain Modulation Power Converter with PSFB ZTE and HSHB Reference Design

This is a 350W High Speed Full Bridge Phase Shift ZVT Synchronous Rectification DC/DC reference design. It is built for telecom applications to supply a RF Power Amplifier stage. The design is utilizing UCC28950 voltage mode forward and average current limitation backward converter (two quadrant (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8606 — 300W Full Bridge Phase Shifted (FBPS) DC/DC Power Supply Reference Design

This design is a 100kHz FBPS converter working in voltage mode. It supports 400Vdc..750Vdc input voltage range and provides 24V/12A regulated. TI's UCC28950 part enables high efficiency at high input voltage.
Test report: PDF
Schematic: PDF
Reference designs

PMP5568 — A Fully Featured, 350W Offline High Performance Power Supply Reference Design

This project is a complete 350W, high performance, high speed offline power supply solution. It contains a novel, microcontroller-driven synchronous bridge rectifier, a 2-phase interleaved PFC stage and a phase-shifted fullbridge as down converter. It has an universal input (85 .. 265V AC) and the (...)
User guide: PDF
Schematic: PDF
Reference designs

PMP6712 — Dual-channel full-bridge converter reference design (54 V @ 30 A) for PoE power sourcing (PSE)

This is a phase-shifted full-bridge converter reference design capable of delivering 1600 W of isolated output power and achieving efficiency of greater than 96%. This design uses the UCC28950 controller in a dual-phase primary/secondary configuration. An LM5017 constant on-time synchronous buck (...)
Test report: PDF
Schematic: PDF
Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

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  • Ongoing reliability monitoring

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