UCC29950
- High Efficiency PFC and Half-Bridge Resonant LLC Combo Controller
- Continuous Conduction Mode (CCM) Boost Power Factor Correction
- Supports Self-Bias or Auxiliary (external) Bias Mode of Operation
- PFC Loops Fully Internally Compensated
- PFC Stage Design in 3 Easy Steps
(design voltage feedback, current feedback and power stage) - Fixed 100-kHz PFC Frequency with Dithering for Ease of EMI Compliance
- True Input Power Limit, Independent of Line Voltage
- Fixed LLC Frequency Operating Range of 70 kHz to 350 kHz
- Dead-Time Varied Across Load Range for LLC Half-Bridge Power Stage to Extend ZVS Range
- Three-Level LLC Over-Current Protection
- Hiccup Mode Operation for Continuous Overload and Short-Circuit Power Protection
- Low Standby Power Consumption Enabled by Active Control of High-Voltage Start-Up MOSFET and X-Cap Discharge Function
- Built In Soft-Start and Converter Sequencing to Simplify Design
- AC Line Brownout Protection, with Fail Indicator
- PFC Bus Over-Voltage and Under-Voltage Protection
- Over-Temperature Protection
- External Gate Drivers for Scalability with Power Level
- SOIC-16 Package
The UCC29950 provides all the control functionality for an AC-to-DC converter with a CCM boost Power Factor Correction (PFC) stage followed by an LLC converter stage. The controller is optimized to allow ease of use.
Proprietary CCM PFC algorithms enable the system to achieve high efficiency, smaller converter size with high power factor. The integrated LLC controller enables a high-efficiency DC-to-DC conversion stage utilizing soft switching for low EMI noise. Integration of PFC control and LLC control in a combo controller allows the control algorithms to take advantage of information from both stages.
The controller includes a control circuit for start-up using a Depletion Mode MOSFET with internal device power management that minimizes external component requirements and helps lower system implementation costs.
To further reduce the standby power an X-Cap discharge circuit is integrated. The UCC29950 implements a complete suite of system protection functions, including AC line brownout, PFC bus under voltage PFC and LLC, over current and thermal shutdown.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | UCC29950 CCM PFC and LLC Combo Controller datasheet (Rev. A) | PDF | HTML | 20 Mar 2015 |
| Technical article | Power Tips: Centralized control makes power supply design easier | 18 Dec 2015 | ||
| EVM User's guide | Using the UCC29950EVM-631 300-W PFC/LLC Off-Line PSU Module (Rev. A) | 11 Mar 2015 | ||
| Application note | LLC Design for UCC29950 | 16 Feb 2015 | ||
| More literature | Designing an LLC Resonant Half-Bridge Power Converter | 26 Jul 2011 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
PMP30192 — Universal Input, 360W PFC + LLC with Combo-IC Reference Design
PMP11237 — Power Supply Reference Design with Single Layer PCB and UCC29950 LLC+PFC Combo Controller
PMP11303 — High Efficiency 350W AC/DC Power Supply Reference Design
TIDA-00520 — 300-W PFC plus Resonant LLC Half-Bridge controller off-line AC/DC PSU Module
| Package | Pins | Download |
|---|---|---|
| SOIC (D) | 16 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.