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The LLC converter is a resonant inverter with three reactive elements where the DC input voltage is turned into a square wave by a switch network arranged as either a half- or full-bridge to feed the resonant LLC tank that effectively filters out harmonics providing a sinusoidal like voltage and current waveform. This in turn feeds a transformer that provides voltage scaling and primary-secondary isolation. The converter power flow is controlled by modulating the square wave frequency with respect to the tank circuit's resonance.

In an LLC resonant converter, all semiconductor 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; resulting in low electro-magnetic emissions levels (EMI). In addition, it can enable a high degree of integration in the magnetic parts, enabling the design of converters with higher efficiency and power density.

Our range of power MOSFETs, rectifiers, advanced digital controllers and high-performance STM32 microcontrollers – with an extended range of dedicated peripherals including high-resolution PWM timers and high-speed ADCs – together with our hardware and software evaluation and development tools including reference designs enable developers to fully exploit the benefits of an LLC converter.

LLC resonant converter half bridge circuit diagram
00 Files selected for download

Technical Documentation

    • Description Version Size Action
      AN5034
      12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller
      2.0
      7.59 MB
      PDF
      AN5118
      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller
      1.1
      5.26 MB
      PDF
      AN5106
      150 V – 150 W LED driver using the STCMB1 transition mode PFC and HBR resonant tank combo controller
      3.0
      6.17 MB
      PDF
      AN3339
      185 W power supply with PFC and standby supply for LED TV using the L6564, L6599A, and VIPER27LN
      2.0
      1.52 MB
      PDF
      AN5035
      19 V - 90 W adapter based on the STCMB1, combo TM PFC and HB LLC
      2.0
      1.41 MB
      PDF
      AN4026
      19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699
      1.3
      988.23 KB
      PDF
      AN3014
      19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A
      3.1
      1.59 MB
      PDF
      AN4930
      500 W fully digital AC-DC power supply (D-SMPS) evaluation board
      1.0
      8.73 MB
      PDF
      AN1768
      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES
      1.1
      46.82 KB
      PDF
      AN2644
      An introduction to LLC resonant half-bridge converter
      2.0
      1.27 MB
      PDF
      AN4656
      Bootloading procedure for STLUX™ and STNRG™ digital controllers
      3.1
      588.34 KB
      PDF
      AN2025
      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION
      1.1
      147.59 KB
      PDF
      AN604
      Calculation of conduction losses in a power rectifier
      3.2
      137.74 KB
      PDF
      AN4021
      Calculation of reverse losses in a power diode
      1.0
      120.47 KB
      PDF
      AN4381
      Current sharing in parallel diodes
      1.0
      449.12 KB
      PDF
      AN5264
      EVL400W-EUPL7 400W SMPS demonstration board
      2.0
      6.03 MB
      PDF
      AN4338
      EVLSTNRG-170W: 170 W SMPS with digitally controlled PFC and resonant LLC stage based on the STNRG388A
      2.0
      3.36 MB
      PDF
      AN4539
      HRTIM cookbook
      4.0
      1.05 MB
      PDF
      AN4720
      Half bridge resonant LLC converters and primary side MOSFET selection
      1.0
      1.4 MB
      PDF
      AN5119
      How to design an application from draft with STNRG011
      1.1
      343.91 KB
      PDF
      AN2450
      LLC resonant half-bridge converter design guideline
      6.0
      746.74 KB
      PDF
      AN4406
      MDmesh™ M2: the new ST super-junction technology ideal for resonant topologies
      1.0
      652.78 KB
      PDF
      AN1453
      NEW FAMILY OF 150V POWER SCHOTTKY
      1.1
      131.48 KB
      PDF
      AN5046
      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages
      4.0
      4.82 MB
      PDF
      AN5088
      Rectifiers thermal management, handling and mounting recommendations
      2.0
      2.32 MB
      PDF
      AN533
      SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting
      3.6
      217.19 KB
      PDF
      AN443
      SERIES OPERATION ON FAST RECTIFIERS
      2.1
      202.48 KB
      PDF
      AN4674
      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family
      2.0
      963.78 KB
      PDF
      AN4599
      STEVAL-ISA132V1 24 V 300 W peak power resonant converter
      3.0
      904.42 KB
      PDF
      AN4667
      STM32F7 Series system architecture and performance
      4.0
      1.59 MB
      PDF
      AN1542
      THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION
      1.1
      57.47 KB
      PDF
      AN869
      Tj max limit of Schottky diodes
      2.2
      60.9 KB
      PDF
      AN5034

      12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller

      AN5118

      12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller

      AN5106

      150 V – 150 W LED driver using the STCMB1 transition mode PFC and HBR resonant tank combo controller

      AN3339

      185 W power supply with PFC and standby supply for LED TV using the L6564, L6599A, and VIPER27LN

      AN5035

      19 V - 90 W adapter based on the STCMB1, combo TM PFC and HB LLC

      AN4026

      19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699

      AN3014

      19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A

      AN4930

      500 W fully digital AC-DC power supply (D-SMPS) evaluation board

      AN1768

      ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES

      AN2644

      An introduction to LLC resonant half-bridge converter

      AN4656

      Bootloading procedure for STLUX™ and STNRG™ digital controllers

      AN2025

      CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION

      AN604

      Calculation of conduction losses in a power rectifier

      AN4021

      Calculation of reverse losses in a power diode

      AN4381

      Current sharing in parallel diodes

      AN5264

      EVL400W-EUPL7 400W SMPS demonstration board

      AN4338

      EVLSTNRG-170W: 170 W SMPS with digitally controlled PFC and resonant LLC stage based on the STNRG388A

      AN4539

      HRTIM cookbook

      AN4720

      Half bridge resonant LLC converters and primary side MOSFET selection

      AN5119

      How to design an application from draft with STNRG011

      AN2450

      LLC resonant half-bridge converter design guideline

      AN4406

      MDmesh™ M2: the new ST super-junction technology ideal for resonant topologies

      AN1453

      NEW FAMILY OF 150V POWER SCHOTTKY

      AN5046

      Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages

      AN5088

      Rectifiers thermal management, handling and mounting recommendations

      AN533

      SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting

      AN443

      SERIES OPERATION ON FAST RECTIFIERS

      AN4674

      SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family

      AN4599

      STEVAL-ISA132V1 24 V 300 W peak power resonant converter

      AN4667

      STM32F7 Series system architecture and performance

      AN1542

      THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION

      AN869

      Tj max limit of Schottky diodes

    • Description Version Size Action
      DT0009
      Speed up development of the L6699 with the L6599A and flexible PCB layout
      1.2
      264.38 KB
      PDF
      DT0009

      Speed up development of the L6699 with the L6599A and flexible PCB layout

Presentations & Training Material

    • Description Version Size Action
      EuP Lot 6 Tier2 Ecodesign requirements for Standby
      2.2 MB
      PDF
      L6699: Double-ended controller specific to series-resonant half-bridge topology 2.0
      430.88 KB
      PDF
      Primary side regulation controllers portfolio
      1.1 MB
      PDF

      EuP Lot 6 Tier2 Ecodesign requirements for Standby

      L6699: Double-ended controller specific to series-resonant half-bridge topology

      Primary side regulation controllers portfolio

Publications and Collaterals

    • Description Version Size Action
      1200V SiC diodes, 2 to 40 A in surface-mount and through-hole packages 1.0
      748.77 KB
      PDF
      Industrial-grade SiC diodes - 650V and low VF - to boost the performance of power converters 2.0
      958.23 KB
      PDF
      ST Diodes Finder : the new app for Android and iOS 2.0
      1.46 MB
      PDF

      1200V SiC diodes, 2 to 40 A in surface-mount and through-hole packages

      Industrial-grade SiC diodes - 650V and low VF - to boost the performance of power converters

      ST Diodes Finder : the new app for Android and iOS

    • Description Version Size Action
      Diodes and rectifiers selection guide 2.0
      815.09 KB
      PDF

      Diodes and rectifiers selection guide

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output Power

V This option is required and must be a number.
A This option is required and must be a number.

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