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UCC28950

ACTIVE

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

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Data sheet

UCC28950

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 17 Operating temperature range (°C) -40 to 125 Control mode Current, Voltage Topology Phase-shifted full bridge Rating Catalog Features Adjustable switching frequency, Current limiting, Error amplifier, Light-load efficiency, SR logic, Soft start, Soft switching Duty cycle (max) (%) 95
Vin (max) (V) 17 Operating temperature range (°C) -40 to 125 Control mode Current, Voltage Topology Phase-shifted full bridge Rating Catalog Features Adjustable switching frequency, Current limiting, Error amplifier, Light-load efficiency, SR logic, Soft start, Soft switching Duty cycle (max) (%) 95
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4
  • Enhanced zero-voltage switching (ZVS) range
  • Direct synchronous rectifier (SR) control
  • Light-load efficiency management including:
    • Burst mode operation
    • Discontinuous conduction mode (DCM), dynamic SR on/off control
  • 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
  • 150µA start-up current
  • VDD undervoltage lockout
  • Wide temperature range: –40°C to +125°C
  • Enhanced zero-voltage switching (ZVS) range
  • Direct synchronous rectifier (SR) control
  • Light-load efficiency management including:
    • Burst mode operation
    • Discontinuous conduction mode (DCM), dynamic SR on/off control
  • 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
  • 150µA start-up current
  • VDD undervoltage lockout
  • Wide temperature range: –40°C to +125°C

The UCC28951 controller is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. The UCC2895x devices use advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

ZVS operation ensured over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

Easily get started with the UCC2895x 600W phase shifted full bridge design review/application note,

The 24-pin, TSSOP package complies with RoHS requirements.

The UCC28951 controller is an enhanced version of the UCC28950. It is a fully compatible drop-in replacement for the UCC28950. The UCC2895x devices use advanced control of the full-bridge in addition to active control of the synchronous rectifier (SR) output stage.

ZVS operation ensured over a wide range of operating conditions, while the load current naturally tunes the switching delays of the secondary-side synchronous rectifiers(SR). This functionality maximizes overall system efficiency.

Easily get started with the UCC2895x 600W phase shifted full bridge design review/application note,

The 24-pin, TSSOP package complies with RoHS requirements.
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Technical documentation

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Type Title Date
* Data sheet UCC2895x Phase-Shifted Full-Bridge Controller for Wide-Input Voltage Range Applications datasheet (Rev. B) PDF | HTML 17 Oct 2024
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 PDF | HTML 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
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
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. C)

SLUM169C.ZIP (168 KB) - PSpice Model
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Simulation model

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

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

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

SLUM277A.TSC (739 KB) - TINA-TI Reference Design
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Calculation tool

SLUC210 — UCC28950 MathCAD Design Tool

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
UCC28950 — Green phase-shifted full-bridge controller with Synchronous Rectification control UCC28950-Q1 — Automotive 8V to 20V full-bridge, phase-shifted PWM controller with synchronous rectification
Download
Calculation tool

SLUC222 — UCC28950 Excel Design Tool

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
UCC28950 — Green phase-shifted full-bridge controller with Synchronous Rectification control UCC28950-Q1 — Automotive 8V to 20V full-bridge, phase-shifted PWM controller with synchronous rectification
Hardware development
Evaluation board
UCC28950EVM-442 — UCC28950 600-W, Phase-Shifted, Full-Bridge Converter Evaluation Module
Download
Schematic

HPA442B Gerber Files

SLUR038.ZIP (292 KB)
Download
Schematic

UCC28950 HPA471 Gerbers

SLUR039.ZIP (208 KB)
Download
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

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 CAD symbols, footprints & 3D models
TSSOP (PW) 24 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • REACH
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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
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