Calculation tool
UCC28950-Q1
Automotive 8V to 20V full-bridge, phase-shifted PWM controller with synchronous rectification
Data sheet
UCC28950-Q1
- Qualified for Automotive Applications
- AEC-Q100 Qualified With the Following Results:
- Device Temperature Grade 1: –40ºC to 125ºC Ambient
Operating Temperature Range - Device HBM ESD Classification Level H2
- Device CDM ESD Classification Level C3B
- Device Temperature Grade 1: –40ºC to 125ºC Ambient
- 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 - 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
- 150-µA Start-Up Current
- VDD Undervoltage Lockout
- Wide Temperature Range, –40°C to 125°C
The UCC28950-Q1 enhanced phase-shifted controller builds upon Texas Instruments’ industry-standard UCCx895 phase-shifted controller family with enhancements that offer best-in-class efficiency in today’s high-performance power systems. The UCC28950-Q1 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 ranges, while the load current naturally tunes the secondary-side switching delays of the synchronous rectifiers, maximizing overall system efficiency.
The UCC28950-Q1 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-Q1 includes support for peak current along with 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. It is easy to arrange 90-degree phase-shifted interleaved synchronized operation between two converters.
The UCC28950-Q1 is available in a TSSOP-24 package.
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Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC28950-Q1, Green Phase-Shifted Full-Bridge Controller with Synchronous Rectif datasheet (Rev. B) | 15 Sep 2012 | |
| Application note | UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) | PDF | HTML | 04 Mar 2022 | |
| Application note | Making the Correct Choice: UCC28950-Q1 or UCC28951-Q1 | 13 Nov 2017 | ||
| 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 | 600-W, Phase-Shifted, Full-Bridge Converter (Rev. A) | 19 May 2010 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
UCC28950EVM-442 — UCC28950 600-W, Phase-Shifted, Full-Bridge Converter Evaluation Module
The UCC28950EVM-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 UCC28950 control device could be used in (...)
User guide: PDF
Calculation tool
SLUC222 — UCC28950 Excel Design Tool
Supported products & hardware
Products
AC/DC & DC/DC controllers (external FET)
Hardware development
Evaluation board
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| TSSOP (PW) | 24 | Ultra Librarian |
Ordering & quality
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- MTBF/FIT estimates
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- Qualification summary
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