UCC29950 Overview
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.
UCC29950 Key Features
- 1 High Efficiency PFC and Half-Bridge Resonant LLC bo Controller
- Continuous Conduction Mode (CCM) Boost Power Factor Correction
- Supports Self-Bias or Auxiliary (external) Bias Mode of Operation
- PFC Loops Fully Internally pensated
- 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 pliance
- 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
UCC29950 Applications
- Offline AC-to-DC Server Power Supplies (80 PLUS® Bronze/Silver/Gold)