Texas Instruments: UCC28950EVM-442 UCC28950 600-W, Phase-Shifted, Full-Bridge Converter Evaluation Module

atomar — Wed, 25 Jun 2014 00:52:52 GMT

Current Revision posted to Documents by atomar on 6/25/2014 12:52:52 AM

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Kit Overview

The Texas Instruments UCC28950EVM-442UCC28950EVM-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 UCC28950UCC28950 control device could be used in high-efficiency applications by achieving ZVS from 50% to 100% load. To achieve this high efficiency the UCC28950EVM-442UCC28950EVM-442 was designed to drive synchronous rectifiers on the secondary side of the full bridge converter. The UCC28950 also incorporates a burst mode and DCM function to improve no-load efficiency.

The DCM (Discontinues Current Mode) comparator was designed to turn off the synchronous rectifiers before the output current reaches critical conduction at lighter loads (< 20%). This does two things. First it removes the energy that is required to drive the FETs at lighter loads. Second the DCM feature prevents the output inductor from developing a negative current that can damage the output synchronous rectifiers under no load/transient conditions.

The UCC28950UCC28950 enhanced phase-shifted controller builds upon Texas Instruments’s industry standard UCCx895 phase-shifted controller family with enhancements that offer best in class efficiency in today’s high performance power systems. The UCC28950UCC28950 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.

Key Applications: Server, Telecom Power Supplies, Industrial Power Systems, High-Density Power Architectures

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Technical Documents

Learning Center

Type	Description
User Guide	TI: User Guide for UCC28950EVM-442 600-W, Phase-Shifted, Full-Bridge Converter
Datasheet	TI: Data Sheet for UCC28950 - Green Phase-Shifted Full-Bridge Controller With Synchronous Rectification
Application Note	TI: Application Note for Frequency Dithering With the UCC28950 and TLV3201
Application Note	TI: Application Note for Synchronizing Three or More UCC28950 Phase-Shifted Full-Bridge Controllers
Application Note	TI: Application Note for Pre-biased Output Voltage Startup Operation of the UCC28950 Phase-Shifted Full-Bridge Controller
Application Note	TI: Application Note for UCC28950 600W Phase Shifted Full Bridge Design Review

Design Elements

Type	Description
Reference Design	TI: Reference Design for UCC28950 TINA-TI
Simulation Model	TI: UCC28950 PSpice Average Model
Simulation Model	TI: UCC28950 PSpice Transient Model (Rev. A)
Simulation Model	TI: UCC28950 TINA-TI Average Spice Model
Application Library	TI: Software Code for UCC28950 Excel Design Tool (Rev. B)
CAD Model	TI: CAD Model for UCC28950

Video

Kit Features

Key Features for UCC28950EVM-442UCC28950EVM-442 Evaluation Module:

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

Key Feature for UCC28950UCC28950 Green Phase-Shifted Full-Bridge Controller with Synchronous Rectification:

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

Kit Contents

The Texas Instruments UCC28950EVM-442UCC28950EVM-442 Evaluation Module is supplied with below contents:

Evaluation Board

Tags: ucc28950evm_442, ucc28950, texas_instruments, ucc28950evm-442