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Non-Isolated Auxiliary Power Supply up to 20W

Overview
Documentation
Tools and Software
HW Evaluation Tools
Solutions
Key Products
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.  
non isolated auxiliary power supply up to 2w block diagram

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.

All resources

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Resource title
Version
Latest update

Application Notes (5 of 15)

Resource title
Version
Latest update
AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family
4.2 05 Apr 2022
05 Apr 2022
AN4260 12 V, 150 mA non-isolated buck converter using the VIPER06XS, from the VIPer™ plus family 4.2
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
AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052
1.0 05 Apr 2022
05 Apr 2022
AN4941 7 W dual output (-5 V/+7 V) non-isolated flyback converter with capacitive touch sensing using VIPer0P and STM32L052 1.0
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
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
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
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
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
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
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
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
AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback
2.0 05 Apr 2022
05 Apr 2022
AN4836 STEVAL-ISA174V1: VIPer0P 7 W double output non-isolated flyback 2.0
AN4855 STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01
2.0 05 Apr 2022
05 Apr 2022
AN4855 STEVAL-ISA177V1 5 V/4.25 W non-isolated flyback demo with VIPer01 2.0
AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01
1.0 05 Apr 2022
05 Apr 2022
AN4858 STEVAL-ISA178V1 5 V/1 W 30 kHz buck demo with VIPer01 1.0
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
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User Manual (1)

Resource title
Version
Latest update
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
Version
Latest update
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

All tools & software

    • Part number
      		Status
      		Description
      		Type
      		Supplier

      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

      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

    • Part Number
      		Description
      		Core product
      		Tool Type
      		Supplier
      		Sort by: part number

      STEVAL-ISA010V1
      Active

      Ultra wide range dual output back converter demonstration board based on the VIPER16

      		 - AC-DC Converter -
      STEVAL-ISA010V1
      Active

      Ultra wide range dual output back converter demonstration board based on the VIPER16

      STEVAL-ISA071V2
      Active

      4 W non-insulated, wide input voltage range SMPS based on the VIPer16

      		 - AC-DC Converter -
      STEVAL-ISA071V2
      Active

      4 W non-insulated, wide input voltage range SMPS based on the VIPer16

      STEVAL-ISA096V1
      Active

      Auxiliary power supply in buck-boost topology based on the Viper06

      		 VIPER06 AC-DC Converter -
      STEVAL-ISA096V1
      Active

      Auxiliary power supply in buck-boost topology based on the Viper06

      STEVAL-ISA111V1
      Active

      Wide range single output demonstration board based on the VIPER26HN

      		 - AC-DC Converter -
      STEVAL-ISA111V1
      Active

      Wide range single output demonstration board based on the VIPER26HN

      STEVAL-ISA112V1
      Active

      Wide range non-isolated flyback demonstration board, single-output 12 V/4 W based on the VIPER06HN

      		 - AC-DC Converter -
      STEVAL-ISA112V1
      Active

      Wide range non-isolated flyback demonstration board, single-output 12 V/4 W based on the VIPER06HN

      STEVAL-ISA113V1
      Active

      Wide range single-output demonstration board based on the VIPER06HS

      		 - AC-DC Converter -
      STEVAL-ISA113V1
      Active

      Wide range single-output demonstration board based on the VIPER06HS

      STEVAL-ISA114V1
      Active

      5 V/0.8 W wide-range 30 kHz buck converter based on the VIPer06XS

      		 - AC-DC Converter ST
      STEVAL-ISA114V1
      Active

      5 V/0.8 W wide-range 30 kHz buck converter based on the VIPer06XS

      STEVAL-ISA115V1
      Active

      12 V, 150 mA non-isolated buck converter using VIPer™ Plus - VIPER06XS

      		 - AC-DC Converter ST
      STEVAL-ISA115V1
      Active

      12 V, 150 mA non-isolated buck converter using VIPer™ Plus - VIPER06XS

      STEVAL-ISA116V1
      Active

      5 W, 2-output wide-range buck converter based on the VIPER26LD

      		 - AC-DC Converter ST
      STEVAL-ISA116V1
      Active

      5 W, 2-output wide-range buck converter based on the VIPER26LD

      STEVAL-ISA118V1
      Active

      Offline power converter demonstration board using the Viper16

      		 - AC-DC Converter -
      STEVAL-ISA118V1
      Active

      Offline power converter demonstration board using the Viper16

      STEVAL-ISA119V1
      Active

      1.5 W double output buck demonstration board based on the VIPER16LD

      		 - AC-DC Converter -
      STEVAL-ISA119V1
      Active

      1.5 W double output buck demonstration board based on the VIPER16LD

      STEVAL-ISA129V1
      Active

      16 V-280 mA non isolated off-line high voltage converter based on the VIPer16H

      		 - AC-DC Converter -
      STEVAL-ISA129V1
      Active

      16 V-280 mA non isolated off-line high voltage converter based on the VIPer16H

      STEVAL-ISA130V1
      Active

      12 V 140 mA 30 kHz non-isolated buck topology regulator based on VIPer06XN

      		 - AC-DC Converter -
      STEVAL-ISA130V1
      Active

      12 V 140 mA 30 kHz non-isolated buck topology regulator based on VIPer06XN

      STEVAL-ISA174V1
      Active

      7 W dual output offline flyback converter for home appliances using VIPer0P

      		 - AC-DC Converter ST
      STEVAL-ISA174V1
      Active

      7 W dual output offline flyback converter for home appliances using VIPer0P

      STEVAL-ISA177V1
      Active

      5 V, 0.85 A flyback converter using VIPer™ Plus - VIPer01

      		 - AC-DC Converter ST
      STEVAL-ISA177V1
      Active

      5 V, 0.85 A flyback converter using VIPer™ Plus - VIPer01

      STEVAL-ISA178V1
      Active

      5 V / 200 mA high voltage buck-converter based on VIPer01

      		 - AC-DC Converter ST
      STEVAL-ISA178V1
      Active

      5 V / 200 mA high voltage buck-converter based on VIPer01

      STEVAL-ISA179V1
      Active

      15 V, 0.15 A buck converter using VIPer™ Plus - VIPer0P

      		 - AC-DC Converter ST
      STEVAL-ISA179V1
      Active

      15 V, 0.15 A buck converter using VIPer™ Plus - VIPer0P

      STEVAL-ISA192V1
      Active

      7 W dual output flyback converter with standby managed by capacitive touch using VIPer0P and STM32L

      		 - AC-DC Converter ST
      STEVAL-ISA192V1
      Active

      7 W dual output flyback converter with standby managed by capacitive touch using VIPer0P and STM32L

      STEVAL-ISA195V1
      Active

      5 V / 0.36 A buck converter using VIPerPlus ? VIPer11

      		 VIPER11 AC-DC Converter ST
      STEVAL-ISA195V1
      Active

      5 V / 0.36 A buck converter using VIPerPlus ? VIPer11

      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-VP013B1B
      Active

      5 V / 100 mA high voltage optimized buck-converter based on VIPer013BLS

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-VP013B1B
      Active

      5 V / 100 mA high voltage optimized buck-converter based on VIPer013BLS

      STEVAL-VP12201B
      Active

      15 V/200 mA buck converter based on VIPER122

      		 VIPER122 AC-DC Converter ST
      STEVAL-VP12201B
      Active

      15 V/200 mA buck converter based on VIPER122

      STEVAL-VP22201B
      Active

      5 V - 360 mA buck converter based on VIPer222XSTR

      		 - PSU and Converter Solution Eval Boards ST
      STEVAL-VP22201B
      Active

      5 V - 360 mA buck converter based on VIPer222XSTR

      STEVAL-VP319X1B
      Active

      5 V / 0.6 A Buck converter based on VIPER319X

      		 - AC-DC Converter ST
      STEVAL-VP319X1B
      Active

      5 V / 0.6 A Buck converter based on VIPER319X