LLC Resonant Converter
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.
Resources
Technical Documentation
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AN5034: 12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller | 1.0 | 6.38 MB |
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AN5118: 12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller | 1.0 | 5.26 MB |
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AN3339: 185 W power supply with PFC and standby supply for LED TV using the L6564, L6599A, and VIPER27LN | 2.0 | 1.52 MB |
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AN5035: 19 V - 90 W adapter based on the STCMB1, combo TM PFC and HB LLC | 2.0 | 1.41 MB |
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AN4026: 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 | 1.3 | 988.23 KB |
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AN3014: 19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A | 3.1 | 1.59 MB |
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AN4930: 500 W fully digital AC-DC power supply (D-SMPS) evaluation board | 1.0 | 8.73 MB |
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AN1768: ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES | 1.1 | 46.82 KB |
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AN2644: An introduction to LLC resonant half-bridge converter | 2.0 | 1.27 MB |
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AN2025: CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION | 1.1 | 147.59 KB |
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AN604: Calculation of conduction losses in a power rectifier | 3.2 | 137.74 KB |
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AN4021: Calculation of reverse losses in a power diode | 1.0 | 120.47 KB |
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AN4381: Current sharing in parallel diodes | 1.0 | 449.12 KB |
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AN4338: EVLSTNRG-170W: 170 W SMPS with digitally controlled PFC and resonant LLC stage based on the STNRG388A | 2.0 | 3.36 MB |
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AN4539: HRTIM cookbook | 1.1 | 560.48 KB |
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AN4720: Half bridge resonant LLC converters and primary side MOSFET selection | 1.0 | 1.4 MB |
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AN5119: How to design an application from draft with STNRG011 | 1.0 | 343.37 KB |
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AN2450: LLC resonant half-bridge converter design guideline | 6.0 | 746.74 KB |
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AN4406: MDmesh™ M2: the new ST super-junction technology ideal for resonant topologies | 1.0 | 652.78 KB |
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AN1453: NEW FAMILY OF 150V POWER SCHOTTKY | 1.1 | 131.48 KB |
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AN5046: Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT™ packages | 3.0 | 5.33 MB |
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AN5088: Rectifiers thermal management, handling and mounting recommendations | 2.0 | 2.32 MB |
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AN533: SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting | 3.6 | 217.19 KB |
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AN443: SERIES OPERATION ON FAST RECTIFIERS | 2.1 | 202.48 KB |
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AN4674: SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family | 2.0 | 963.78 KB |
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AN4599: STEVAL-ISA132V1 24 V 300 W peak power resonant converter | 3.0 | 904.42 KB |
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AN4667: STM32F7 Series system architecture and performance | 4.0 | 1.59 MB |
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AN1542: THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION | 1.1 | 57.47 KB |
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AN869: Tj max limit of Schottky diodes | 2.2 | 60.9 KB |
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DT0009: Speed up development of the L6699 with the L6599A and flexible PCB layout | 1.1 | 262.2 KB |
Presentations & Training Material
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EuP Lot 6 Tier2 Ecodesign requirements for Standby | 2.2 MB | |
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L6699: Double-ended controller specific to series-resonant half-bridge topology | 2.0 | 430.88 KB |
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Primary side regulation controllers portfolio | 1.1 MB |
Publications and Collaterals
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1200V SiC diodes, 2 to 40 A in surface-mount and through-hole packages | 1.0 | 748.77 KB |
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500-650 V MDmesh™ M2: The New ST’s High Voltage Super-junction MOSFET Series | 1.0 | 720.83 KB |
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600-650 V MDmesh™ M2: The ST’s new Super-junction HV MOSFET series | 1.0 | 755.53 KB |
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Industrial-grade SiC diodes - 650V and low VF - to boost the performance of power converters | 2.0 | 958.23 KB |
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ST Diodes Finder : the new app for Android and iOS | 2.0 | 1.46 MB |
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Diodes and rectifiers selection guide | 2.0 | 815.09 KB |
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Power MOSFET Selection Guide | 1.0 | 1.21 MB |
