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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
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