ST Life.augmented


Wide range single-output demonstration board based on the VIPER37LE
  • active Active

The STEVAL-ISA121V1 demonstration board implements a 15 W single-output wide range mains power supply to be used as an auxiliary adapter in applications such as LCD, plasma or LED TVs, desktop computers, etc., when the main power supply is OFF or in standby mode and the auxiliary power supply must provide energy only to some specific parts of the equipment such as USB ports, remote receiver, etc.

The board uses the new VIPER37LE, an offline high voltage converter from the VIPerPlus family, specifically designed for fixed frequency flyback converters, which combines a high-performance low voltage PWM controller chip and a max. 4.5 Ω RDS(on), 800 V BV(DSS), avalanche-rugged power MOSFET in the same package.

The application is optimized for less than 30 mW standby consumption and meets EPA 2.0 limits, thereby helping to meet the most stringent energy-saving requirements.

The board implements several protection features that considerably increase end-product safety and reliability: overload protection, overvoltage protection, brownout protection, hysteretic thermal protection, shorted secondary rectifier detection, and transformer saturation protection, all of which are in auto-restart mode.

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Data Brief

Key Features

  • Universal input mains range:
  • input voltage 90 - 264 VAC
  • frequency 45 - 65 Hz
  • Single-output voltage: 5 V @ 3 A continuous operation
  • Standby mains consumption:< 30 mW @ 230 VAC
  • Average efficiency: > 75%
  • Complies with EuP Lot 6 requirements
  • Fully protected against faults overload, overvoltage, transformer saturation and overheating
  • Compliant with EMC norm EN55022-Class-B
  • RoHS compilant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1850: Wide range single-output demonstration board based on the VIPER37LE
1.0 271 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA121V1 gerber files
1.0 253 KB

Bill of Materials

Description Version Size
1.0 50 KB

Schematic Pack

Description Version Size
STEVAL-ISA121V1 schematics
1.0 129 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-ISA121V1ActiveVIPER37LEBuy Direct126.17Distributor reported inventory date: 2016-02-05
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.
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