Flyback Converter Design, Block Diagrams

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In its various implementations including primary side and secondary side regulation, fixed switching frequency or quasi resonant operation, an isolated or non-isolated flyback topology is most often found in off-line converters for an output power ranging from a few watts up to 100 W.

The circuit operation is based on a single switch topology and the energy taken from the input is stored in the transformer’s primary inductance while the power switch is switched on, and transferred to the secondary output when the power switch is switched off.

Efficiency, power density and low stand-by power together are key requirements for flyback topologies together with reliability.

In addition to a range of controllers, power MOSFETs and integrated high-voltage converters as well as diodes and protection devices, ST offers a full set of hardware and software development and evaluation tools to help design high-efficiency, flyback AC-DC converters.

Flyback Converter block diagrams

Flyback Synch. Rect Controller

STripFET F7 series

Picture	Solution
	45Watt 12V Power Supply SL-STCH03-45W Active

45Watt 12V Power Supply

SL-STCH03-45W

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Application Notes (5 of 59)

Design Notes & Tips (2)

	Resource title		Latest update
PDF	DN0039 35 W wide input range flyback converter using HVLED001A quasi resonant Flyback controller and STF10LN80K5 1.1		13 Sep 2018	13 Sep 2018 DN0039 35 W wide input range flyback converter using HVLED001A quasi resonant Flyback controller and STF10LN80K5 1.1
PDF	DN0009 VIPer06X buck regulator, 12V 140 mA 1.2		16 Jul 2019	16 Jul 2019 DN0009 VIPer06X buck regulator, 12V 140 mA 1.2

Presentations (1)

	Resource title		Latest update
PDF	Primary side regulation controllers portfolio		21 Jun 2018	21 Jun 2018 Primary side regulation controllers portfolio

Flyers (5)

	Resource title	Latest update
PDF	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
PDF	800-1050V MDmesh™ K5 ST’s first super-junction VHV MOSFET Series 1.0	06 Feb 2020	06 Feb 2020 800-1050V MDmesh™ K5 ST’s first super-junction VHV MOSFET Series 1.0
PDF	800-1700 V MDmesh K5 STPOWER MOSFET very high voltage super-junction series 1.0	06 Oct 2020	06 Oct 2020 800-1700 V MDmesh K5 STPOWER MOSFET very high voltage super-junction series 1.0
PDF	SOD128Flat power Schottky diodes for improved cost and space-savings 1.0	10 Sep 2018	10 Sep 2018 SOD128Flat power Schottky diodes for improved cost and space-savings 1.0
PDF	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
PDF	Diodes and rectifiers selection guide 2.0			Diodes and rectifiers selection guide 2.0

Brochures (2)

	Resource title		Latest update
PDF	VIPerPlus - Bring a Plus to your SMPS design 05.2020		14 May 2020	14 May 2020 VIPerPlus - Bring a Plus to your SMPS design 05.2020
PDF	VIPerPlus evaluation boards 05.2018		23 Aug 2018	23 Aug 2018 VIPerPlus evaluation boards 05.2018

All tools & software

Finders Apps

Part number	Status	Description	Type	Supplier
ST Protection Finder	Active	Protection product finder application for Android, iOS and Wandoujia	Finders Apps	ST
ST Voltage Regulator Finder	Active	Linear and switching voltage regulators and voltage reference applications for smartphones and tablets	Finders Apps	ST
STPOWER MOSFET Finder	Active	STPOWER MOSFET finder mobile app for tablets and smartphones	Finders Apps	ST

ST Protection Finder

Description:

Protection product finder application for Android, iOS and Wandoujia

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

eDesignSuite

Converter

Converter

DC/DC AC/DC

Input

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

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

Output

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

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

	Resource title	Latest update
PDF	AN4685 12 V, 10 W isolated flyback converter based on VIPer25HD 1.0	16 Jun 2015	16 Jun 2015 AN4685 12 V, 10 W isolated flyback converter based on VIPer25HD 1.0
PDF	AN4479 12 V, 15 W peak 20 W isolated flyback converter based on VIPer38LE 1.0	13 Sep 2018	13 Sep 2018 AN4479 12 V, 15 W peak 20 W isolated flyback converter based on VIPer38LE 1.0
PDF	AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2	26 Jan 2015	26 Jan 2015 AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2
PDF	AN4940 12 V, 7.2 W VIPer0P IR remote controlled flyback topology for air conditioning applications using VIPer0P 1.0	13 Sep 2018	13 Sep 2018 AN4940 12 V, 7.2 W VIPer0P IR remote controlled flyback topology for air conditioning applications using VIPer0P 1.0
PDF	AN4924 12 V, 8.4 W peak power 30 W isolated flyback converter using VIPer38HD 1.0	13 Sep 2018	13 Sep 2018 AN4924 12 V, 8.4 W peak power 30 W isolated flyback converter using VIPer38HD 1.0
PDF	AN4812 15 W, 12 V output, isolated flyback converter using Viper35HD device from the VIPer™ Plus family of high voltage converters 2.0	26 Sep 2019	26 Sep 2019 AN4812 15 W, 12 V output, isolated flyback converter using Viper35HD device from the VIPer™ Plus family of high voltage converters 2.0
PDF	AN4830 15 W, 5 V - 12 V double output, isolated flyback converter based on Viper37LE/D 1.0	13 Sep 2018	13 Sep 2018 AN4830 15 W, 5 V - 12 V double output, isolated flyback converter based on Viper37LE/D 1.0
PDF	AN4896 15 W, 5 V output USB adapter using STCH02 1.0	13 Sep 2018	13 Sep 2018 AN4896 15 W, 5 V output USB adapter using STCH02 1.0
PDF	AN5030 16 W, triple output, quasi-resonant flyback converter for air conditioning applications using VIPerPlus – VIPER35LD 1.0	13 Sep 2018	13 Sep 2018 AN5030 16 W, triple output, quasi-resonant flyback converter for air conditioning applications using VIPerPlus – VIPER35LD 1.0
PDF	AN4410 3 W, 5 V isolated flyback converter using the VIPer06HN, from the VIPer™ plus family 2.0	13 Sep 2018	13 Sep 2018 AN4410 3 W, 5 V isolated flyback converter using the VIPer06HN, from the VIPer™ plus family 2.0
PDF	AN4418 3 W, 5 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family 2.0	13 Sep 2018	13 Sep 2018 AN4418 3 W, 5 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family 2.0
PDF	AN2811 3.5 W non-isolated offline constant-current LED driver based on VIPER17 1.2	13 Sep 2018	13 Sep 2018 AN2811 3.5 W non-isolated offline constant-current LED driver based on VIPER17 1.2
PDF	AN1439 30 W AC-DC adapter with the L6565 quasi-resonant PWM controller 7.0	13 Sep 2018	13 Sep 2018 AN1439 30 W AC-DC adapter with the L6565 quasi-resonant PWM controller 7.0
PDF	AN5316 35 W wide input range flyback converter using HVLED001B quasi-resonant flyback controller and STF10LN80K5 2.0	02 Jun 2020	02 Jun 2020 AN5316 35 W wide input range flyback converter using HVLED001B quasi-resonant flyback controller and STF10LN80K5 2.0
PDF	AN5335 35W transition-mode flyback converter with ultra-low THD based on HVLED007 1.2	19 Dec 2019	19 Dec 2019 AN5335 35W transition-mode flyback converter with ultra-low THD based on HVLED007 1.2
PDF	AN4404 4 W, 12 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family 2.0	13 Sep 2018	13 Sep 2018 AN4404 4 W, 12 V isolated flyback converter using the VIPer06HS, from the VIPer™ plus family 2.0
PDF	AN5442 45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD 1.1	27 Mar 2020	27 Mar 2020 AN5442 45W USB Type-C™ PD adapter board with controllers STCH03 QR flyback,SRK1001 adaptive synchronous rectifier and STUSB4761 USB Type-C™ PD 1.1
PDF	AN2753 6 W single-output VIPer17 demonstration board 2.1	13 Sep 2018	13 Sep 2018 AN2753 6 W single-output VIPer17 demonstration board 2.1
PDF	AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 1.0	13 Sep 2018	13 Sep 2018 AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 1.0
PDF	AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1	24 Mar 2020	24 Mar 2020 AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES 1.1
PDF	AN4407 Advantage of the use of an added driver source lead in discrete Power MOSFETs 2.0	02 Feb 2015	02 Feb 2015 AN4407 Advantage of the use of an added driver source lead in discrete Power MOSFETs 2.0
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	24 Mar 2020	24 Mar 2020 AN604 Calculation of conduction losses in a power rectifier 3.2
PDF	AN4021 Calculation of reverse losses in a power diode 1.0	24 Mar 2020	24 Mar 2020 AN4021 Calculation of reverse losses in a power diode 1.0
PDF	AN4381 Current sharing in parallel diodes 1.0	24 Mar 2020	24 Mar 2020 AN4381 Current sharing in parallel diodes 1.0
PDF	AN3028 EVLVIP16L-4WFN: 16 V / 4.5 W, 60 kHz non-isolated flyback demonstration board using the VIPer16LN 1.0	13 Sep 2018	13 Sep 2018 AN3028 EVLVIP16L-4WFN: 16 V / 4.5 W, 60 kHz non-isolated flyback demonstration board using the VIPer16LN 1.0
PDF	AN2840 EVLVIP17-5WCHG: 5 W low standby consumption battery charger demonstration board based on the VIPER17HN 1.1	26 Jul 2015	26 Jul 2015 AN2840 EVLVIP17-5WCHG: 5 W low standby consumption battery charger demonstration board based on the VIPER17HN 1.1
PDF	AN4106 EVLVIP26L-12WFN: 12 V/12 W, 60 kHz non-isolated flyback 1.0	13 Sep 2018	13 Sep 2018 AN4106 EVLVIP26L-12WFN: 12 V/12 W, 60 kHz non-isolated flyback 1.0
PDF	AN2950 EVLVIPER28L-10W: 5 V/10 W, 60 kHz isolated flyback with extra power management 1.0	13 Sep 2018	13 Sep 2018 AN2950 EVLVIPER28L-10W: 5 V/10 W, 60 kHz isolated flyback with extra power management 1.0
PDF	AN4932 HVLED001A - enhanced QR high power factor flyback controller for LED drivers 2.0	09 Jan 2019	09 Jan 2019 AN4932 HVLED001A - enhanced QR high power factor flyback controller for LED drivers 2.0
PDF	AN1326 L6565 quasi-resonant controller 7.3	13 Sep 2018	13 Sep 2018 AN1326 L6565 quasi-resonant controller 7.3
PDF	AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1	24 Mar 2020	24 Mar 2020 AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
PDF	AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0	24 Mar 2020	24 Mar 2020 AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
PDF	AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0	24 Mar 2020	24 Mar 2020 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	24 Mar 2020	24 Mar 2020 AN533 SCRs, TRIACs, and AC switches, thermal management precautions for handling and mounting 3.6
PDF	AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1	24 Mar 2020	24 Mar 2020 AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
PDF	AN5333 SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family 1.0	19 Dec 2019	19 Dec 2019 AN5333 SRK1001 adaptive synchronous rectification controller for flyback converters evaluation board family 1.0
PDF	AN2934 STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS demonstration board based on the VIPer17 1.0	18 Mar 2015	18 Mar 2015 AN2934 STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS demonstration board based on the VIPer17 1.0
PDF	AN4165 STEVAL-ISA111V1: 12 V / 12 W, 115 kHz non-isolated flyback 2.0	19 Mar 2015	19 Mar 2015 AN4165 STEVAL-ISA111V1: 12 V / 12 W, 115 kHz non-isolated flyback 2.0
PDF	AN4116 STEVAL-ISA112V1: 12 V/4 W, 115 kHz non-isolated flyback 1.0	19 Mar 2015	19 Mar 2015 AN4116 STEVAL-ISA112V1: 12 V/4 W, 115 kHz non-isolated flyback 1.0
PDF	AN4164 STEVAL-ISA113V1: 12 V/4 W, 115 kHz non-isolated flyback 1.0	19 Mar 2015	19 Mar 2015 AN4164 STEVAL-ISA113V1: 12 V/4 W, 115 kHz non-isolated flyback 1.0
PDF	AN4273 STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS 3.0	19 Mar 2015	19 Mar 2015 AN4273 STEVAL-ISA114V1: 5 V / 0.8 W 30 kHz buck with the VIPer06XS 3.0
PDF	AN4562 STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD 1.0	19 Mar 2015	19 Mar 2015 AN4562 STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD 1.0
PDF	AN4259 STEVAL-ISA117V1 12 V / 4.2 W, 60 kHz flyback isolated with VIPer16LN 3.0	03 Jun 2015	03 Jun 2015 AN4259 STEVAL-ISA117V1 12 V / 4.2 W, 60 kHz flyback isolated with VIPer16LN 3.0
PDF	AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD 1.0	19 Mar 2015	19 Mar 2015 AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD 1.0
PDF	AN4372 STEVAL-ISA134V1: 12 V / 4 W, 115 kHz isolated flyback 2.0	19 Mar 2015	19 Mar 2015 AN4372 STEVAL-ISA134V1: 12 V / 4 W, 115 kHz isolated flyback 2.0
PDF	AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback 2.0	13 Sep 2018	13 Sep 2018 AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback 2.0
PDF	AN4878 STEVAL-ISA175V1 three-output isolated flyback converter for smart meter and power line communication systems based on VIPER26HD 1.0	13 Sep 2018	13 Sep 2018 AN4878 STEVAL-ISA175V1 three-output isolated flyback converter for smart meter and power line communication systems based on VIPER26HD 1.0
PDF	AN4855 STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01 2.0	22 Jan 2020	22 Jan 2020 AN4855 STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01 2.0
PDF	AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01 1.0	13 Sep 2018	13 Sep 2018 AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01 1.0
PDF	AN4857 STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P 1.0	13 Sep 2018	13 Sep 2018 AN4857 STEVAL-ISA179V1 15 V/2.25 W 60 kHz buck demo with VIPer0P 1.0
PDF	AN4905 STEVAL-ISA180V1 12 V/0.6 A isolated flyback demo with VIPer0P 1.0	13 Sep 2018	13 Sep 2018 AN4905 STEVAL-ISA180V1 12 V/0.6 A isolated flyback demo with VIPer0P 1.0
PDF	AN2945 STM8S and STM32™ MCUs: a consistent 8/32-bit product line for painless migration 1.4	13 Sep 2018	13 Sep 2018 AN2945 STM8S and STM32™ MCUs: a consistent 8/32-bit product line for painless migration 1.4
PDF	AN2872 Super wide-range buck converter based on the VIPer16 1.2	22 Jan 2020	22 Jan 2020 AN2872 Super wide-range buck converter based on the VIPer16 1.2
PDF	AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1	13 Sep 2018	13 Sep 2018 AN1542 THE THERMAL RUNAWAY LAW IN SCHOTTKY USED IN OR-ING APPLICATION 1.1
PDF	AN869 Tj max limit of Schottky diodes 2.2	24 Mar 2020	24 Mar 2020 AN869 Tj max limit of Schottky diodes 2.2
PDF	AN4419 VIPER37HE: 15 W wide range single output evaluation board 1.0	13 Sep 2018	13 Sep 2018 AN4419 VIPER37HE: 15 W wide range single output evaluation board 1.0
PDF	AN2929 Wide range [90 V - 265 V] input, 5 V - 12 W output VIPER27LN demonstration board with improved standby performance 2.0	13 Sep 2018	13 Sep 2018 AN2929 Wide range [90 V - 265 V] input, 5 V - 12 W output VIPER27LN demonstration board with improved standby performance 2.0
PDF	AN3011 Wide range input (90 - 265), single output (5 V-11 W) EVLVIP27H-12SB, VIPer27 demonstration board 1.1	13 Sep 2018	13 Sep 2018 AN3011 Wide range input (90 - 265), single output (5 V-11 W) EVLVIP27H-12SB, VIPer27 demonstration board 1.1

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Flyback Converter

Flyback Converter block diagrams

Featured Products

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All resources

Application Notes (5 of 59)

Design Notes & Tips (2)

Presentations (1)

Flyers (5)

Selection Guides (1)

Brochures (2)

All tools & software

Finders Apps

ST Protection Finder

ST Voltage Regulator Finder

STPOWER MOSFET Finder

eDesignSuite