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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. Read more

LLC resonant converter half bridge circuit diagram

Resonant Controllers

LLC Synchronous Rectification Controllers

Auxiliary SMPS

40 V to 100 V/STripFET F7 series

40 V to 100 V/STripFET F7 series

40 V to 100 V/STripFET F7 series

40 V to 100 V/STripFET F7 series

40 V to 100 V/STripFET F7 series

40 V to 100 V/STripFET F7 series

Our products and solutions

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.

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	Resource title	Version	Latest update
PDF	DT0009 Speed up development of the L6699 with the L6599A and flexible PCB layout	1.2	23 Apr 2021	23 Apr 2021 DT0009 Speed up development of the L6699 with the L6599A and flexible PCB layout 1.2

	Resource title	Version	Latest update
PDF	EuP Lot 6 Tier2 Ecodesign requirements for Standby		19 Jun 2018	19 Jun 2018 EuP Lot 6 Tier2 Ecodesign requirements for Standby
PDF	L6699: Double-ended controller specific to series-resonant half-bridge topology	2.0	18 Mar 2021	18 Mar 2021 L6699: Double-ended controller specific to series-resonant half-bridge topology 2.0
PDF	Primary side regulation controllers portfolio		21 Jun 2018	21 Jun 2018 Primary side regulation controllers portfolio

	Resource title	Version	Latest update
PDF	1200 V SiC diodes, 2 to 40 a in surface-mount and through-hole packages	1.0	25 May 2021	25 May 2021 1200 V SiC diodes, 2 to 40 a in surface-mount and through-hole packages 1.0
PDF	ST Diodes Finder : the new app for Android and iOS	2.0	02 Jul 2021	02 Jul 2021 ST Diodes Finder : the new app for Android and iOS 2.0

	Resource title	Version	Latest update
PDF	Diodes and rectifiers selection guide	2.0	17 Mar 2021	17 Mar 2021 Diodes and rectifiers selection guide 2.0

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	Part number	Status	Description	Type	Supplier
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	ST Voltage Regulator Finder	Active	Linear and switching voltage regulators and voltage reference applications for smartphones and tablets	Finder Apps	ST	ST Voltage Regulator Finder Description: Linear and switching voltage regulators and voltage reference applications for smartphones and tablets
Worldwide,Asia,Europe,Africa,North America,South America,Oceania,Afghanistan,Bahrain,Bangladesh,Bhutan,Brunei,Burma (Myanmar),Cambodia,China,East Timor,India,Indonesia,Iraq,Japan,Jordan,Kazakhstan,Kuwait,Kyrgyzstan,Laos,Malaysia,Maldives,Mongolia,Nepal,Oman,Pakistan,Philippines,Qatar,Russian Federation,Saudi Arabia,Singapore,South Korea,Sri Lanka,Taiwan,Tajikistan,Thailand,Turkmenistan,United Arab Emirates,Uzbekistan,Vietnam,Yemen,Albania,Andorra,Armenia,Austria,Azerbaijan,Belarus,Belgium,Bosnia and Herzegovina,Bulgaria,Croatia,Cyprus,Czech Republic,Denmark,Estonia,Finland,France,Georgia,Germany,Greece,Hungary,Iceland,Ireland,Israel,Italy,Latvia,Liechtenstein,Lithuania,Luxembourg,Macedonia,Malta,Moldova,Monaco,Montenegro,Netherlands,Norway,Poland,Portugal,Romania,San Marino,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,Turkey,Ukraine,United Kingdom,Vatican City,Algeria,Angola,Benin,Botswana,Burkina,Burundi,Cameroon,Cape Verde,Central African Republic,Chad,Comoros,Democratic Republic of Congo,Djibouti,Egypt,Equatorial Guinea,Eritrea,Ethiopia,Gabon,Gambia,Ghana,Guinea,Guinea-Bissau,Ivory Coast,Kenya,Lesotho,Liberia,Libya,Madagascar,Malawi,Mali,Mauritania,Mauritius,Morocco,Mozambique,Namibia,Niger,Nigeria,Rwanda,Sao Tome and Principe,Senegal,Seychelles,Sierra Leone,Somalia,South Africa,Swaziland,Tanzania,Togo,Tunisia,Uganda,Zambia,Zimbabwe,Antigua and Barbuda,Bahamas,Barbados,Belize,Canada,Costa Rica,Dominica,Dominican Republic,El Salvador,Grenada,Guatemala,Haiti,Honduras,Jamaica,Mexico,Nicaragua,Panama,Saint Kitts and Nevis,Saint Lucia,Saint Vincent and the Grenadines,Trinidad and Tobago,United States,Argentina,Bolivia,Brazil,Chile,Colombia,Ecuador,Guyana,Paraguay,Peru,Suriname,Uruguay,Venezuela,Australia,Fiji,Kiribati,Marshall Islands,Micronesia,Nauru,New Zealand,Palau,Papua New Guinea,Samoa,Solomon Islands,Tonga,Tuvalu,Vanuatu	STPOWER MOSFET Finder	Active	STPOWER MOSFET finder mobile app for tablets and smartphones	Finder Apps	ST	STPOWER MOSFET Finder Description: STPOWER MOSFET finder mobile app for tablets and smartphones

All Hardware Evaluation Tools

Evaluation Tools

Part Number	Description	Core product	Tool Type	Supplier	Sort by: part number
EVL-SRK2001-HVS Active	Evaluation board for SRK2001 adaptive synchronous rectification controller for LLC resonant converter with high voltage external sensing MOSFETs	SRK2001	PSU and Converter Solution Eval Boards	-	EVL-SRK2001-HVS Active Evaluation board for SRK2001 adaptive synchronous rectification controller for LLC resonant converter with high voltage external sensing MOSFETs
EVLCMB1-90WADP Active	19 V - 90 W adapter based on the STCMB1, TM PFC and HB LLC combo controller	STCMB1	PSU and Converter Solution Eval Boards	-	EVLCMB1-90WADP Active 19 V - 90 W adapter based on the STCMB1, TM PFC and HB LLC combo controller
EVLCMB1-AIO210W Active	12 V - 210 W adapter based on STCMB1, combo TM PFC and HB LLC	STCMB1	PSU and Converter Solution Eval Boards	-	EVLCMB1-AIO210W Active 12 V - 210 W adapter based on STCMB1, combo TM PFC and HB LLC
EVLSTNRG-170W Active	170W SMPS with digitally controlled PFC and resonant LLC stage using STNRG388A	STNRG388A	PSU and Converter Solution Eval Boards	-	EVLSTNRG-170W Active 170W SMPS with digitally controlled PFC and resonant LLC stage using STNRG388A
EVLSTNRG011-150 Active	12 V, 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller	STNRG011	PSU and Converter Solution Eval Boards	ST	EVLSTNRG011-150 Active 12 V, 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller
STEVAL-DPSLLCK1 Active	3 kW Full Bridge LLC resonant digital power supply evaluation kit	-	PSU and Converter Solution Eval Boards	ST	STEVAL-DPSLLCK1 Active 3 kW Full Bridge LLC resonant digital power supply evaluation kit
STEVAL-ISA132V1 Active	300 W peak power (170 W continuous power) LLC resonant converter based on L6699, STB13N60M2 and STPS20M80CG	L6699	PSU and Converter Solution Eval Boards	ST	STEVAL-ISA132V1 Active 300 W peak power (170 W continuous power) LLC resonant converter based on L6699, STB13N60M2 and STPS20M80CG
STEVAL-ISA138V1 Active	19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699	L6699	PSU and Converter Solution Eval Boards	-	STEVAL-ISA138V1 Active 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699
STEVAL-ISA147V3 Active	500 W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 microcontroller	STM32F334C8	PSU and Converter Solution Eval Boards	ST	STEVAL-ISA147V3 Active 500 W fully digital AC-DC power supply (D-SMPS) based on STM32F334C8 microcontroller
STEVAL-ISA165V1 Active	Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STP120N4F6	SRK2001	PSU and Converter Solution Eval Boards	ST	STEVAL-ISA165V1 Active Evaluation board: SRK2001 adaptive synchronous rectification controller for LLC resonant converters with STP120N4F6
STEVAL-ISA170V1 Active	12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001	L6563H	PSU and Converter Solution Eval Boards	ST	STEVAL-ISA170V1 Active 12 V - 150 W resonant converter with synchronous rectification based on L6563H, L6699 and SRK2001
STEVAL-PCC020V2 Active	Interface board USB to I2C/UART to be used with STNRG digital power controller products (STNRG01x and STone)	STM32F373C8	PSU and Converter Solution Eval Boards	ST	STEVAL-PCC020V2 Active Interface board USB to I2C/UART to be used with STNRG digital power controller products (STNRG01x and STone)

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Bookmark

LLC Resonant Converter

Our products and solutions

All resources

Application Notes (5 of 33)

Design Notes & Tips (1)

Presentations (3)

Flyers (2)

Selection Guides (1)

All tools & software

Finder Apps

ST Voltage Regulator Finder

STPOWER MOSFET Finder

All Hardware Evaluation Tools

Evaluation Tools

EVL-SRK2001-HVS

EVLCMB1-90WADP

EVLCMB1-AIO210W

EVLSTNRG-170W

EVLSTNRG011-150

STEVAL-DPSLLCK1

STEVAL-ISA132V1

STEVAL-ISA138V1

STEVAL-ISA147V3

STEVAL-ISA165V1

STEVAL-ISA170V1

STEVAL-PCC020V2

	Resource title	Version	Latest update
PDF	AN5034 12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller	2.0	23 Apr 2021	23 Apr 2021 AN5034 12 V - 210 W converter based on STCMB1, combo TM PFC, HB LLC and SRK2001, adaptive SR controller 2.0
PDF	AN5118 12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller	1.2	23 Apr 2021	23 Apr 2021 AN5118 12 V – 150 W power supply based on STNRG011 digital combo and SRK2001 adaptive synchronous rectifier controller 1.2
PDF	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
PDF	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
PDF	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
PDF	AN4026 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699	1.3	07 Mar 2019	07 Mar 2019 AN4026 19 V - 90 W adapter with PFC for laptop computers using the L6563H and L6699 1.3
PDF	AN3014 19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A	3.1	13 Sep 2018	13 Sep 2018 AN3014 19 V, 90 W resonant converter with synchronous rectification using L6563H, L6599A and SRK2000A 3.1
PDF	AN4930 500 W fully digital AC-DC power supply (D-SMPS) evaluation board	1.0	23 Apr 2021	23 Apr 2021 AN4930 500 W fully digital AC-DC power supply (D-SMPS) evaluation board 1.0
PDF	AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES	1.1	23 Apr 2021	23 Apr 2021 AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
PDF	AN2644 An introduction to LLC resonant half-bridge converter	2.0	23 Apr 2021	23 Apr 2021 AN2644 An introduction to LLC resonant half-bridge converter 2.0
PDF	AN4656 Bootloading procedure for STLUX™ and STNRG™ digital controllers	3.1	19 Mar 2021	19 Mar 2021 AN4656 Bootloading procedure for STLUX™ and STNRG™ digital controllers 3.1
PDF	AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION	1.1	13 Sep 2018	13 Sep 2018 AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
PDF	AN604 Calculation of conduction losses in a power rectifier	3.2	06 Jul 2021	06 Jul 2021 AN604 Calculation of conduction losses in a power rectifier 3.2
PDF	AN4021 Calculation of reverse losses in a power diode	1.0	06 Jul 2021	06 Jul 2021 AN4021 Calculation of reverse losses in a power diode 1.0
PDF	AN4381 Current sharing in parallel diodes	1.0	06 Jul 2021	06 Jul 2021 AN4381 Current sharing in parallel diodes 1.0
PDF	AN5644 DC/DC resonant converter for industrial applications using MasterGaN1	1.0	13 Apr 2021	13 Apr 2021 AN5644 DC/DC resonant converter for industrial applications using MasterGaN1 1.0
PDF	AN5264 EVL400W-EUPL7 400W SMPS demonstration board	2.0	23 Apr 2021	23 Apr 2021 AN5264 EVL400W-EUPL7 400W SMPS demonstration board 2.0
PDF	AN4338 EVLSTNRG-170W: 170 W SMPS with digitally controlled PFC and resonant LLC stage based on the STNRG388A	2.0	23 Apr 2021	23 Apr 2021 AN4338 EVLSTNRG-170W: 170 W SMPS with digitally controlled PFC and resonant LLC stage based on the STNRG388A 2.0
PDF	AN4539 HRTIM cookbook	4.0	23 Apr 2021	23 Apr 2021 AN4539 HRTIM cookbook 4.0
PDF	AN4720 Half bridge resonant LLC converters and primary side MOSFET selection	1.0	23 Apr 2021	23 Apr 2021 AN4720 Half bridge resonant LLC converters and primary side MOSFET selection 1.0
PDF	AN5119 How to design an application from draft with STNRG011	1.1	23 Apr 2021	23 Apr 2021 AN5119 How to design an application from draft with STNRG011 1.1
PDF	AN2450 LLC resonant half-bridge converter design guideline	6.0	23 Apr 2021	23 Apr 2021 AN2450 LLC resonant half-bridge converter design guideline 6.0
PDF	AN4406 MDmesh™ M2: the new ST super-junction technology ideal for resonant topologies	1.0	23 Apr 2021	23 Apr 2021 AN4406 MDmesh™ M2: the new ST super-junction technology ideal for resonant topologies 1.0
PDF	AN1453 NEW FAMILY OF 150V POWER SCHOTTKY	1.1	06 Jul 2021	06 Jul 2021 AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
PDF	AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages	4.0	23 Apr 2021	23 Apr 2021 AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
PDF	AN5088 Rectifiers thermal management, handling and mounting recommendations	2.0	06 Jul 2021	06 Jul 2021 AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
PDF	AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting	3.6	03 May 2021	03 May 2021 AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
PDF	AN443 SERIES OPERATION ON FAST RECTIFIERS	2.1	06 Jul 2021	06 Jul 2021 AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
PDF	AN4674 SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family	2.0	23 Apr 2021	23 Apr 2021 AN4674 SRK2001 adaptive synchronous rectification controller for LLC resonant converter evaluation board family 2.0
PDF	AN4599 STEVAL-ISA132V1 24 V 300 W peak power resonant converter	3.0	13 Sep 2018	13 Sep 2018 AN4599 STEVAL-ISA132V1 24 V 300 W peak power resonant converter 3.0
PDF	AN4667 STM32F7 Series system architecture and performance	4.0	23 Apr 2021	23 Apr 2021 AN4667 STM32F7 Series system architecture and performance 4.0
PDF	AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION	1.1	23 Apr 2021	23 Apr 2021 AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
PDF	AN869 Tj max limit of Schottky diodes	2.2	06 Jul 2021	06 Jul 2021 AN869 Tj max limit of Schottky diodes 2.2

Search History

Bookmark

LLC Resonant Converter

Our products and solutions

All resources

Application Notes (5 of 33)

Design Notes & Tips (1)

Presentations (3)

Flyers (2)

Selection Guides (1)

All tools & software

Finder Apps

ST Voltage Regulator Finder

STPOWER MOSFET Finder

All Hardware Evaluation Tools

Evaluation Tools

EVL-SRK2001-HVS

EVLCMB1-90WADP

EVLCMB1-AIO210W

EVLSTNRG-170W

EVLSTNRG011-150

STEVAL-DPSLLCK1

STEVAL-ISA132V1

STEVAL-ISA138V1

STEVAL-ISA147V3

STEVAL-ISA165V1

STEVAL-ISA170V1

STEVAL-PCC020V2

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