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UCC28950

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Green phase-shifted full-bridge controller with Synchronous Rectification control

Data sheet
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Green phase-shifted full-bridge controller with Synchronous Rectification control

UCC28950

ACTIVE
Data sheet Order now

Product details

Parameters

Topology Phase-Shifted Full-Bridge Control method Current, Voltage VCC (Min) (V) 8 VCC (Max) (V) 17 Duty cycle (Max) (%) 95 UVLO thresholds on/off (V) 7.3/6.75 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 0.2 Features Adjustable Switching Frequency, Current Limiting, Error Amplifier, Light Load Efficiency, Multi-topology, SR Logic, Soft Start, Soft Switching, Synchronization Pin Rating Catalog 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

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 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
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Description

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. open-in-new Find other PWM controllers & resonant controllers
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Exact equivalent in functionality and parametrics to the compared device:
UCC28951 ACTIVE Green phase-shifted full-bridge controller with SR control for Wide input voltage Range This product can be designed for enhanced performance across a wider operating input voltage range.

Technical documentation

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

Design & development

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

Hardware development

EVALUATION BOARD Download
199
Description

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. 

Features
  • ZVS from 50 to 100% load
  • Example of High efficiency design for 80 + Applications
  • Burst mode/DCM Function to reduce no load power dissipation to meet green mode requirements
View details

Design tools & simulation

SIMULATION MODEL Download
SLUM169B.ZIP (153 KB) - PSpice Model
SIMULATION MODEL Download
SLUM276A.TSC (738 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM277A.TSC (739 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLUM278A.ZIP (98 KB) - TINA-TI Spice Model
CALCULATION TOOL Download
SLUC210D.ZIP (1328 KB)
CALCULATION TOOL Download
SLUC222D.ZIP (184 KB)
SCHEMATIC Download
SLUR038.ZIP (292 KB)
SCHEMATIC Download
SLUR039.ZIP (208 KB)

Reference designs

REFERENCE DESIGNS Download
36-60Vin, 350W Slow Drain Modulation Power Converter with PSFB ZTE and HSHB Reference Design
PMP7246 — 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 (...)
document-generic Schematic
REFERENCE DESIGNS Download
300W Full Bridge Phase Shifted (FBPS) DC/DC Power Supply Reference Design
PMP8606 — 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.
document-generic Schematic
Design files
View details
REFERENCE DESIGNS Download
A Fully Featured, 350W Offline High Performance Power Supply Reference Design
PMP5568 — 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 (...)
document-generic Schematic
REFERENCE DESIGNS Download
Dual-Channel Full-Bridge Converter (54V @ 30A) for PoE Power Sourcing (PSE)
PMP6712 — PMP6712 is a phase-shifted full-bridge converter capable of delivering 1600W of isolated output power and achieving efficiency of greater than 96%. This design uses the UCC28950 controller in a dual phase master-slave configuration. An LM5017 constant on-time synchronous buck regulator provides bias (...)
REFERENCE DESIGNS Download
350W Slow Drain Modulation Power Converter
PMP5726 — The PMP5726 is 350W High Speed Full Bridge Phase Shift ZVT – Galvanic Isolated Full Bridge 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 (...)
Design files
View details

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 24 View options

Ordering & quality

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  • Ongoing reliability monitoring

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