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Isolated Auxiliary Power Supply up to 20W

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In the power range up to 20W, high-power-density and cost-effective isolated auxiliary power supplies can be designed using single-transistor fly-back, forward or quasi-resonant topologies working at relatively high switching frequencies to minimize transformer and output capacitor size.

isolated auxiliary power supply up to 20w block diagram

Our products and solutions

We offer a range of integrated – actually a power MOSFET, PWM controller and protection circuit in a single package – high-voltage converters providing extremely low stand-by power, high – 800 and 900V – breakdown voltages and a range of protection features to help maximize efficiency and enhance reliability of power supplies.

In addition, we provide a comprehensive set of hardware and software evaluation and development tools as well as reference designs to enable a fast time to market.

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	Resource title	Version	Latest update
PDF	DT0145 PM8803/03C design tip: T2P issue with certain PSE	1.0	18 Mar 2022	18 Mar 2022 DT0145 PM8803/03C design tip: T2P issue with certain PSE 1.0
PDF	DT0146 PM8803/03C design tip: how to solve a marginality of AT standard	1.0	18 Mar 2022	18 Mar 2022 DT0146 PM8803/03C design tip: how to solve a marginality of AT standard 1.0

	Resource title	Version	Latest update
PDF	VIPerPlus - Bring a Plus to your SMPS design	05.2020	11 Apr 2022	11 Apr 2022 VIPerPlus - Bring a Plus to your SMPS design 05.2020

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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 Diode Finder	Active	Diode product finder application for Android and iOS	Finder Apps	ST	ST Diode Finder Description: Diode product finder application for Android and iOS
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

All Hardware Evaluation Tools

Evaluation Tools

Part Number	Description	Core product	Tool Type	Supplier	Sort by: part number
STEVAL-ISA062V1 Active	6 W dual output SMPS demonstration board based on the VIPER17	-	AC-DC Converter	-	STEVAL-ISA062V1 Active 6 W dual output SMPS demonstration board based on the VIPER17
STEVAL-ISA081V1 Active	12 V /1 A SMPS wide range demonstration board based on the VIPER26	-	AC-DC Converter	-	STEVAL-ISA081V1 Active 12 V /1 A SMPS wide range demonstration board based on the VIPER26
STEVAL-ISA117V1 Active	Wide range isolated flyback demonstration board, single output 12 V/4.2 W based on the VIPer16LN	-	AC-DC Converter	-	STEVAL-ISA117V1 Active Wide range isolated flyback demonstration board, single output 12 V/4.2 W based on the VIPer16LN
STEVAL-ISA121V1 NRND	Wide range single-output demonstration board based on the VIPER37LE	-	AC-DC Converter	-	STEVAL-ISA121V1 NRND Wide range single-output demonstration board based on the VIPER37LE
STEVAL-ISA122V1 Active	Wide input-range, single-output 5 V / 11 W power supply demonstration board based on the VIPer27	-	AC-DC Converter	-	STEVAL-ISA122V1 Active Wide input-range, single-output 5 V / 11 W power supply demonstration board based on the VIPer27
STEVAL-ISA125V1 Active	5 V/10 W, 60 kHz isolated flyback with extra power management based on the VIPer28L	-	AC-DC Converter	-	STEVAL-ISA125V1 Active 5 V/10 W, 60 kHz isolated flyback with extra power management based on the VIPer28L
STEVAL-ISA126V1 Active	5 V-2 A, 115 kHz flyback with temporary extra-power management based on the VIPER28HN	VIPER28	AC-DC Converter	-	STEVAL-ISA126V1 Active 5 V-2 A, 115 kHz flyback with temporary extra-power management based on the VIPER28HN
STEVAL-ISA134V1 Active	12 V - 4 W, 115 kHz isolated flyback based on the VIPer06	-	AC-DC Converter	-	STEVAL-ISA134V1 Active 12 V - 4 W, 115 kHz isolated flyback based on the VIPer06
STEVAL-ISA135V1 Active	4 W, 12 V output, isolated flyback converter using VIPer™ Plus - VIPER06HS	-	AC-DC Converter	-	STEVAL-ISA135V1 Active 4 W, 12 V output, isolated flyback converter using VIPer™ Plus - VIPER06HS
STEVAL-ISA136V1 Active	3W, 5V output, isolated flyback converter using VIPer™ Plus - VIPER06HN	-	AC-DC Converter	-	STEVAL-ISA136V1 Active 3W, 5V output, isolated flyback converter using VIPer™ Plus - VIPER06HN
STEVAL-ISA140V1 Active	15W, 12V output, isolated flyback converter using VIPer™ Plus - VIPER37HE	VIPER37	AC-DC Converter	ST	STEVAL-ISA140V1 Active 15W, 12V output, isolated flyback converter using VIPer™ Plus - VIPER37HE
STEVAL-ISA153V1 Active	12 V, 15 W (20 W peak) isolated flyback converter based on the VIPER38LE	-	AC-DC Converter	-	STEVAL-ISA153V1 Active 12 V, 15 W (20 W peak) isolated flyback converter based on the VIPER38LE
STEVAL-ISA162V1 Active	12 V/10 W isolated flyback converter based on VIPer25HD	-	AC-DC Converter	ST	STEVAL-ISA162V1 Active 12 V/10 W isolated flyback converter based on VIPer25HD
STEVAL-ISA171V1 Active	12 V - 15 W quasi resonant flyback converter based on the VIPER35HD	-	AC-DC Converter	ST	STEVAL-ISA171V1 Active 12 V - 15 W quasi resonant flyback converter based on the VIPER35HD
STEVAL-ISA175V1 Active	9.4 W, 15 V-5 V-3.3 V, three output isolated flyback converter for smart meter and power line systems using the VIPER26HD	-	AC-DC Converter	ST	STEVAL-ISA175V1 Active 9.4 W, 15 V-5 V-3.3 V, three output isolated flyback converter for smart meter and power line systems using the VIPER26HD
STEVAL-ISA180V1 Active	12 V - 0.6 A flyback isolated converter using VIPer™ Plus - VIPer0P	-	AC-DC Converter	-	STEVAL-ISA180V1 Active 12 V - 0.6 A flyback isolated converter using VIPer™ Plus - VIPer0P
STEVAL-ISA182V1 Active	8.4 W / 30 W peak power offline flyback converter using VIPER38HD	-	AC-DC Converter	ST	STEVAL-ISA182V1 Active 8.4 W / 30 W peak power offline flyback converter using VIPER38HD
STEVAL-ISA183V1 Active	16 W triple output quasi resonant flyback converter for air conditioning applications using VIPer35LD	-	AC-DC Converter	ST	STEVAL-ISA183V1 Active 16 W triple output quasi resonant flyback converter for air conditioning applications using VIPer35LD
STEVAL-ISA184V1 Active	5V/1.2A 12V/750mA double output flyback converter using VIPER37LD	-	AC-DC Converter	ST	STEVAL-ISA184V1 Active 5V/1.2A 12V/750mA double output flyback converter using VIPER37LD
STEVAL-ISA191V1 Active	5 V - 12 V, 15 W double output isolated flyback converter based on VIPer37LE	-	AC-DC Converter	ST	STEVAL-ISA191V1 Active 5 V - 12 V, 15 W double output isolated flyback converter based on VIPer37LE
STEVAL-ISA196V1 Active	5 V / 1.2 A non-isolated flyback converter using VIPerPlus-VIPer114LS	-	AC-DC Converter	ST	STEVAL-ISA196V1 Active 5 V / 1.2 A non-isolated flyback converter using VIPerPlus-VIPer114LS
STEVAL-ISA197V1 Active	12 V, 7.8 W isolated flyback converter based on VIPer114LS	-	AC-DC Converter	ST	STEVAL-ISA197V1 Active 12 V, 7.8 W isolated flyback converter based on VIPer114LS
STEVAL-VP12201F Active	12 V - 5 W isolated flyback converter based on VIPer122LS	-	AC-DC Converter	ST	STEVAL-VP12201F Active 12 V - 5 W isolated flyback converter based on VIPer122LS
STEVAL-VP26K02F Active	Two output isolated SSR flyback converter for smart meter and PLC systems using VIPER267KDTR	-	AC-DC Converter	ST	STEVAL-VP26K02F Active Two output isolated SSR flyback converter for smart meter and PLC systems using VIPER267KDTR
STEVAL-VP26K03F Active	Double output isolated PSR flyback converter for smart meter and PLC systems using VIPER267KDTR	-	AC-DC Converter	ST	STEVAL-VP26K03F Active Double output isolated PSR flyback converter for smart meter and PLC systems using VIPER267KDTR
STEVAL-VP318L1F Active	15 V / 1.2 A SSR Flyback converter based on VIPer318L	-	AC-DC Converter	ST	STEVAL-VP318L1F Active 15 V / 1.2 A SSR Flyback converter based on VIPer318L
STEVAL-VP318L2F Active	15 V/1.2 A isolated PSR Flyback converter based on VIPER31	VIPER31	AC-DC Converter	ST	STEVAL-VP318L2F Active 15 V/1.2 A isolated PSR Flyback converter based on VIPER31

	Resource title	Version	Latest update
PDF	AN4685 12 V, 10 W isolated flyback converter based on VIPer25HD	1.0	13 Sep 2018	13 Sep 2018 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	05 Apr 2022	05 Apr 2022 AN4479 12 V, 15 W peak 20 W isolated flyback converter based on VIPer38LE 1.0
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	05 Apr 2022	05 Apr 2022 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	05 Apr 2022	05 Apr 2022 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	05 Apr 2022	05 Apr 2022 AN4830 15 W, 5 V - 12 V double output, isolated flyback converter based on Viper37LE/D 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	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	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	AN1768 ADMISSIBLE AVALANCHE POWER OF SCHOTTKY DIODES	1.1	01 Apr 2022	01 Apr 2022 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	13 Sep 2018	13 Sep 2018 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	01 Apr 2022	01 Apr 2022 AN2025 CONVERTER IMPROVEMENT USING SCHOTTKY RECTIFIER AVALANCHE SPECIFICATION 1.1
PDF	AN604 Calculation of conduction losses in a power rectifier	3.2	01 Apr 2022	01 Apr 2022 AN604 Calculation of conduction losses in a power rectifier 3.2
PDF	AN4021 Calculation of reverse losses in a power diode	1.0	01 Apr 2022	01 Apr 2022 AN4021 Calculation of reverse losses in a power diode 1.0
PDF	AN2840 EVLVIP17-5WCHG: 5 W low standby consumption battery charger demonstration board based on the VIPER17HN	1.1	13 Sep 2018	13 Sep 2018 AN2840 EVLVIP17-5WCHG: 5 W low standby consumption battery charger demonstration board based on the VIPER17HN 1.1
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	AN1453 NEW FAMILY OF 150V POWER SCHOTTKY	1.1	29 Mar 2022	29 Mar 2022 AN1453 NEW FAMILY OF 150V POWER SCHOTTKY 1.1
PDF	AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages	4.0	05 Apr 2022	05 Apr 2022 AN5046 Printed circuit board assembly recommendations for STMicroelectronics PowerFLAT packages 4.0
PDF	AN5088 Rectifiers thermal management, handling and mounting recommendations	2.0	01 Apr 2022	01 Apr 2022 AN5088 Rectifiers thermal management, handling and mounting recommendations 2.0
PDF	AN443 SERIES OPERATION ON FAST RECTIFIERS	2.1	29 Mar 2022	29 Mar 2022 AN443 SERIES OPERATION ON FAST RECTIFIERS 2.1
PDF	AN2934 STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS demonstration board based on the VIPer17	1.0	13 Sep 2018	13 Sep 2018 AN2934 STEVAL-ISA062V1: 6 W, wide-range dual and single output SMPS demonstration board based on the VIPer17 1.0
PDF	AN4259 STEVAL-ISA117V1 12 V / 4.2 W, 60 kHz flyback isolated with VIPer16LN	3.0	13 Sep 2018	13 Sep 2018 AN4259 STEVAL-ISA117V1 12 V / 4.2 W, 60 kHz flyback isolated with VIPer16LN 3.0
PDF	AN4372 STEVAL-ISA134V1: 12 V / 4 W, 115 kHz isolated flyback	2.0	13 Sep 2018	13 Sep 2018 AN4372 STEVAL-ISA134V1: 12 V / 4 W, 115 kHz 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	AN4905 STEVAL-ISA180V1 12 V/0.6 A isolated flyback demo with VIPer0P	1.0	05 Apr 2022	05 Apr 2022 AN4905 STEVAL-ISA180V1 12 V/0.6 A isolated flyback demo with VIPer0P 1.0
PDF	AN869 Tj max limit of Schottky diodes	2.2	29 Mar 2022	29 Mar 2022 AN869 Tj max limit of Schottky diodes 2.2
PDF	AN4419 VIPER37HE: 15 W wide range single output evaluation board	1.0	05 Apr 2022	05 Apr 2022 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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Isolated Auxiliary Power Supply up to 20W

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Application Notes (5 of 32)

Design Notes & Tips (2)

Brochures (1)

All tools & software

Finder Apps

ST Diode Finder

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All Hardware Evaluation Tools

Evaluation Tools

STEVAL-ISA062V1

STEVAL-ISA081V1

STEVAL-ISA117V1

STEVAL-ISA121V1

STEVAL-ISA122V1

STEVAL-ISA125V1

STEVAL-ISA126V1

STEVAL-ISA134V1

STEVAL-ISA135V1

STEVAL-ISA136V1

STEVAL-ISA140V1

STEVAL-ISA153V1

STEVAL-ISA162V1

STEVAL-ISA171V1

STEVAL-ISA175V1

STEVAL-ISA180V1

STEVAL-ISA182V1

STEVAL-ISA183V1

STEVAL-ISA184V1

STEVAL-ISA191V1

STEVAL-ISA196V1

STEVAL-ISA197V1

STEVAL-VP12201F

STEVAL-VP26K02F

STEVAL-VP26K03F

STEVAL-VP318L1F

STEVAL-VP318L2F

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