The UCC25661x family is a high-frequency LLC controller implementing input-power proportional control (IPPC) scheme, along with enhanced light-load management and multiple protection features. IPPC widens the control range of the LLC converter and simplifies the design of wide input or output-voltage range applications such as LED drivers and battery chargers. IPPC works without a PFC for non-universal input applications.
The UCC25661x family has enhanced light-load management that improves the efficiency while minimizing audible noise. To minimize standby power, the UCC25661x family directly disables the PFC controller when operating in burst mode.
The automatic capacitive region avoidance scheme along with the adaptive soft start with reverse recovery avoidance scheme verifies that the device never works in a mode where there is a potential to damage the FETs. The automatic capacitive region avoidance scheme makes the controller appropriate for working with a prebiased load.
The UCC25661x family comes with robust protection to help users design a reliable power supply. The UCC25661x family has options supporting high-voltage start-up, X-capacitor (X-cap) discharge, OVP, and extended gain range (EGR). See details in the Device Comparison table.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | UCC25661x Family 750kHz Wide VIN /VOUT Range LLC Controller Optimized for Light-Load Efficiency datasheet (Rev. C) | PDF | HTML | Aug 11, 2026 |
| Application note | Turn Ratio Correction Factor for Integrated Transformer LLC Design | PDF | HTML | Jul 9, 2026 | |
| Application note | FAQs on UCC25661x | PDF | HTML | Jun 18, 2026 | |
| Application brief | LLC-Resonant Controller in Battery Charging Applications: Achieving High Efficiency Across a Wide Output Vol | PDF | HTML | Jun 5, 2026 | |
| White paper | High Efficiency by Leveraging GaN FET in an LLC Resonant Converter Design | PDF | HTML | Sep 24, 2025 | |
| Product overview | UCC25661(-Q1) Selection Guide | PDF | HTML | Sep 4, 2025 | |
| Technical article | Enabling automotive designers to increase power-density and reliability with LLC topology | PDF | HTML | May 2, 2025 | |
| Certificate | CB TEST CERTIFICATE US-43601-UL | Mar 28, 2024 | ||
| Certificate | CB TEST CERTIFICATE US-43600-UL | Mar 28, 2024 |
For additional terms or required resources, click any title below to view the detail page where available.
The UCC25661 evaluation module (EVM) assists designers to evaluate the operation and performance of the UCC25661x LLC Resonant controller (16-pin SOIC package with removed pins for high voltage clearance). This evaluation module demonstrates how UCC25661x controls the LLC resonant half bridge DC-DC (...)
This reference design provides the information for a flat screen TV power design with a height limitation of 10mm. The design uses an interleave transition- mode (TM) power factor correction (PFC) for the main board, and two separate LLC resonant daughter boards which can be changed and were (...)
This reference design is a transition-mode, boost power factor correction (PFC) and half bridge LLC that accepts universal AC input and generates an isolated 24V, 10A output. The design utilizes LMG3622 GaN module on the primary side with integrated driver and current sense emulation for improved (...)
This reference design is an AC/DC battery-backup charger with two outputs: system and battery. A 4-SW bidirectional buck-boost charges the battery and supplies system load. An optional microcontroller disables main power sections, reducing stand-by power while collecting parameters for telemetry.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (DDB) | 14 | Ultra Librarian |
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