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4 W non-insulated, wide input voltage range SMPS based on the VIPer16
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The STEVAL-ISA071V2 demonstration board is a non-insulated SMPS capable of delivering a 4 W output over a wide input voltage range and is designed for a mains application requiring -5 V and +7 V, referred to neutral.

The basic concepts used in this design can also be applied for higher power outputs or different voltage ranges.

The SMPS generates outputs of 5 V and 12 V, referred to the output marked -5 V. The 5 V output is dedicated to supplying an MCU. This configuration allows the use of the MCU to directly drive a Triac (referred to neutral).

The 12 V output is used to supply additional circuits (relays, OA, etc.).

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Data Brief

Key Features

  • Input:
  • VIN: 85 - 264 Vrms
  • f: 45 - 66 Hz
  • Output:
  • 12 VDC± 10% (referred to -5 V), 160 mA
  • -5 VDC ± 4%, 400 mA
  • Maximum output power: 4 W (range is up to 6 W for EU)
  • Standby power: 35 mW at 230 VAC
  • Short-circuit protected
  • Insulation: non-insulated; N connected to output GND
  • EMI: in accordance with EN55022 class B
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1627: 4 W non-insulated, wide input voltage range SMPS based on the VIPer16
1.0 283 KB

User Manual

Description Version Size
UM0920: 4 W non-isolated, wide input-voltage range SMPS demonstration board based on the VIPer16
2.0 916 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA071V2 gerber files
2.1 49 KB

Bill of Materials

Description Version Size
1.0 9 KB

Schematic Pack

Description Version Size
STEVAL-ISA071V2 schematics
2.1 30 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA071V2ActiveVIPER16LBuy Direct36.75Distributor reported inventory date: 2016-02-10
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA20

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
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