ST Life.augmented


Wide range isolated flyback demonstration board, single output 12 V/4.2 W based on the VIPer16LN
  • active Active

This board implements a 4 W single-output wide range mains power supply set in flyback isolated topology, using the VIPER16LN, an off-line high voltage converter by STMicroelectronics.

The features include an 800 V avalanche rugged power section, PWM operation at 60 kHz with frequency jittering for lower EMI, current limiting with adjustable set point, on-board soft-start, a safe auto-restart after a fault condition and a low stand-by power.

The device does not require a biasing circuit to operate because the IC can be supplied by an internal current generator, therefore saving the cost of the transformers auxiliary winding. If the device is biased through an auxiliary winding, the demonstration board can reach very low standby consumption (< 30 mW at 230 VAC, with output load disconnected).

The IC implements several protections that considerably increase end-product safety and reliability: thermal shutdown with hysteresis, delayed overload protection, open loop failure protection (the last one available only if the device is biased through the auxiliary winding).

pdf Download
Data Brief

Key Features

  • Universal input mains range:
  • input voltage 90 - 264 VAC
  • frequency 45 - 65 Hz
  • Single output voltage: 12 V at 0.35 A continuous operation
  • Stand-by mains consumption: < 30 mW at 230 VAC
  • Average efficiency: > 75 %
  • Fully protected against faults (overload, feedback disconnection and overheating)
  • EMI: according to EN55022-Class-B


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1852: Wide range isolated flyback demonstration board, single output 12 V/4.2 W based on the VIPER16LN
1.0 547 KB

Application Notes

Description Version Size
AN4259: STEVAL-ISA117V1: 12 V/4.2 W, 60 kHz flyback isolated with VIPer16LN
1.0 4,558 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA117V1 gerber files
1.0 504 KB

Bill of Materials

Description Version Size
1.0 54 KB

Schematic Pack

Description Version Size
STEVAL-ISA117V1 schematics
1.0 18 KB

License Agreement

Description Version Size
Evaluation products license agreement
1.0 126 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA117V1ActiveVIPer16LNBuy Direct51.45Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order

(*) 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.