Non-Isolated Auxiliary Power Supply up to 20W

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In a number of applications the reference of the secondary circuit is connected to the same reference as the primary – the AC mains. In such cases, an off-line non-isolated auxiliary power supply can be used to provide a regulated DC voltage using an inductor or low-cost transformer – with simplified isolation – as an energy transfer element by modulating the power supply’s duty-cycle. A buck – step-down – topology can be used to generate a positive output with respect to the common terminal and a buck-boost – or step-down/up – when the output voltage needs to be negative. A non-isolated fly-back converter is the alternative when a higher output power is required. Read more

Our products and solutions

We offer a range of integrated – actually a power MOSFET, PWM controller and protection circuitry 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		Latest update

Application Notes (5 of 15)

User Manual (1)

	Resource title		Latest update
PDF	UM1470 STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter 1.0		13 Sep 2018	13 Sep 2018 UM1470 STEVAL-ISA096V1 -12 V/150 mA adaptable buck-boost converter 1.0

Brochures (1)

	Resource title		Latest update
PDF	VIPerPlus - Bring a Plus to your SMPS design 05.2020		22 Apr 2021	22 Apr 2021 VIPerPlus - Bring a Plus to your SMPS design 05.2020

All tools & software

Finders Apps

Part number	Status	Description	Type	Supplier
ST Diode Finder	Active	Diode product finder application for Android and iOS	Finders Apps	ST	ST Diode Finder Description: Diode product finder application for Android and iOS
ST Voltage Regulator Finder	Active	Linear and switching voltage regulators and voltage reference applications for smartphones and tablets	Finders Apps	ST	ST Voltage Regulator Finder Description: Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

	Resource title	Latest update
PDF	AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2	23 Apr 2021	23 Apr 2021 AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2
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	AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 1.0	23 Apr 2021	23 Apr 2021 AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 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	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	AN4165 STEVAL-ISA111V1: 12 V / 12 W, 115 kHz non-isolated flyback 2.0	22 Jan 2020	22 Jan 2020 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	13 Sep 2018	13 Sep 2018 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	13 Sep 2018	13 Sep 2018 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	13 Sep 2018	13 Sep 2018 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	13 Sep 2018	13 Sep 2018 AN4562 STEVAL-ISA116V1: 5 W, 2 output wide range buck converter based on the VIPER26LD 1.0
PDF	AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD 1.0	13 Sep 2018	13 Sep 2018 AN4345 STEVAL-ISA119V1: 1.5 W double output buck product evaluation board based on the VIPER16LD 1.0
PDF	AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback 2.0	23 Apr 2021	23 Apr 2021 AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback 2.0
PDF	AN4855 STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01 2.0	23 Apr 2021	23 Apr 2021 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	23 Apr 2021	23 Apr 2021 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