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LLC Resonant Converter

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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

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Getting started with STM32F334 for digital power conversion
Getting started with STM32F334 for digital power conversion

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Application Notes (5 of 32)

Resource title
Latest update
AN5034 12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller 2.0
24 Mar 2020
24 Mar 2020
AN5034 12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller 2.0
AN5118 12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller 1.1
24 Mar 2020
24 Mar 2020
AN5118 12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller 1.1
AN5106 150 V – 150 W LED driver using the STCMB1 transition mode PFC and HBR resonant tank combo controller 3.0
24 Mar 2020
24 Mar 2020
AN5106 150 V – 150 W LED driver using the STCMB1 transition mode PFC and HBR resonant tank combo controller 3.0
AN3339 185 W power supply with PFC and standby supply for LED TV using the L6564, L6599A, and VIPER27LN 2.0
13 Sep 2018
13 Sep 2018
AN3339 185 W power supply with PFC and standby supply for LED TV using the L6564, L6599A, and VIPER27LN 2.0
AN5035 19 V - 90 W adapter based on the STCMB1, combo TM PFC and HB LLC 2.0
13 Sep 2018
13 Sep 2018
AN5035 19 V - 90 W adapter based on the STCMB1, combo TM PFC and HB LLC 2.0
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Design Notes & Tips (1)

Resource title
Latest update
DT0009 Speed up development of the L6699 with the L6599A and flexible PCB layout 1.2
10 Sep 2019
10 Sep 2019
DT0009 Speed up development of the L6699 with the L6599A and flexible PCB layout 1.2

Presentations (3)

Resource title
Latest update
EuP Lot 6 Tier2 Ecodesign requirements for Standby
19 Jun 2018
19 Jun 2018
EuP Lot 6 Tier2 Ecodesign requirements for Standby
L6699: Double-ended controller specific to series-resonant half-bridge topology 2.0
26 Jun 2018
26 Jun 2018
L6699: Double-ended controller specific to series-resonant half-bridge topology 2.0
Primary side regulation controllers portfolio
21 Jun 2018
21 Jun 2018
Primary side regulation controllers portfolio

Flyers (2)

Resource title
Latest update
1200 V SiC diodes, 2 to 40 a in surface-mount and through-hole packages 1.0
21 Jul 2020
21 Jul 2020
1200 V SiC diodes, 2 to 40 a in surface-mount and through-hole packages 1.0
ST Diodes Finder : the new app for Android and iOS 2.0
23 Mar 2020
23 Mar 2020
ST Diodes Finder : the new app for Android and iOS 2.0

Selection Guides (1)

Resource title
Latest update
Diodes and rectifiers selection guide 2.0
Diodes and rectifiers selection guide 2.0

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      ST Voltage Regulator Finder
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      STPOWER MOSFET Finder
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      		 Finders Apps ST
      ST Voltage Regulator Finder

      Description:

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets
      STPOWER MOSFET Finder

      Description:

      STPOWER MOSFET finder mobile app for tablets and smartphones

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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

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