PFC & LLC

Achieve higher efficiency, reduce THD, and improve power density with our PFC and LLC controllers

Experience the benefits of zero voltage switching, noise immunity and optimized load performance

Paired together, our power factor correction (PFC) and inductor-inductor-capacitor (LLC) controllers offer exceptional performance for power supplies ranging from 100W to 2kW. With features such as zero voltage switching, low electromagnetic interference, high switching frequency capability and optimized load performance, our LLC controllers offer audible noise immunity, while integrated features help simplify your system designs. In switched-mode power supplies, our PFC controllers deliver high efficiency, reduced standby times, a superior power factor, and improved distortion.

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Single-phase PFC controllers

Interleaved PFC controllers

LLC controllers

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Featured PFC & LLC controllers

Design & development resources

Evaluation board

UCC25660 evaluation module

The UCC25660EVM-064 assists designers to evaluate the operation and performance of the UCC25660 LLC resonant controller. This evaluation module (EVM) demonstrates how UCC25660 controls the LLC resonant half-bridge DC/DC converter to achieve high efficiency throughout the load and input voltage (...)

Reference design

180-W universal input PFC + LLC TV power supply reference design

This AC to DC power supply design for TV application provides 12-V, 5-A and 150-V, 0.8-A output from universal AC voltage (90 Vac to 264 Vac). The design uses CRM/DCM PFC controller UCC28056, and LLC controller UCC256404 with enhanced burst mode which enabled for low standby power and smaller (...)

Evaluation board

AC to isolated DC EVM with UCC28056B, UCC256404 and UCC24624

PFCLLCSREVM034 is a 168-W AC/DC supply with a transition-mode power-factor-correction front end and isolated half-bridge LLC resonant converter with synchronous rectification. This EVM accepts AC input from 90 Vrms to 264 Vrms and outputs 12-V DC with 168-W full-load output power.

Technical resources

Video

Implementation of wide output LLC in power tool charging and LED lighting applications

This video session will cover practical implementations and design considerations of achieving a variable output voltage using LLC.

Application note

Improving Transient Response in LLC Converters Using Hybrid Hysteretic Control (Rev. B)

Learn how an innovative LLC control methodology, hybrid hysteretic control (HHC) offers superior transient performance and an simplified LLC power stage.

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Video series

Power factor correction (PFC) basics and design considerations

This video series discusses PFC basics, topology comparisons, and design considerations to achieve a cost-optomizeda and efficienct PFC design.