DC/DC Resonant LLC

Higher efficiency, higher power density, and higher component density have become common in power-supply designs and their applications. To achieve both higher switching frequencies and lower switching losses, many designs are turning to half- or full-bridge resonant LLC topologies. By using a resonant LLC tank, this effectively filters out harmonics resulting in low electro-magnetic emissions levels (EMI). It can also enable a high degree of integration in the magnetic parts, enabling the design of converters with higher efficiency and power density.

Block diagram

Design challenges

  • All switches are soft-switching, or zero-voltage switching (ZVS), at turn-on for the primary MOSFETs and zero-current switching (ZCS) at both turn-on and turn-off for the rectifiers in the secondary

MOSFET and GaN FET Handbook

Drawing on over 20 years’ of experience, the MOSFET and GaN FET Application Handbook: A Power Design Engineer’s Guide brings together a comprehensive set of learning and reference materials relating to the use of MOSFETs and GaN FETs in real world systems.

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