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Double output SMPS for power line applications using the ALTAIR04-900 primary controller
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The STEVAL-ISA133V1 demonstration board implements a 7.5 W double output wide range mains adapter with constant-voltage/constant-current, designed as an innovative AC-DC adapter to supply a complete power line communication system based on the ST7580.

The power supply provides a 13 V output voltage to supply the power line modem (PLM) and the analog circuitry, and a post-regulated 3.3 volts to supply digital circuitry and an optional external microcontroller.

The STEVAL-ISA133V1 demonstration board uses the new ALTAIR04-900, a quasi-resonant (QR) current-mode controller IC specifically designed for QR ZVS (zero voltage switching at switch turn-on) flyback converters, which combines a high-performance low-voltage PWM controller chip and a typical 16 RDSon, 900 V, avalanche-rugged power MOSFET in the same package.

The device is capable of providing constant output voltage regulation using primary-sensing constant voltage loop (CV loop). This eliminates the need for the optocoupler and the secondary voltage reference while maintaining very accurate regulation.

Also, using the primary constant current loop, it is possible to set the maximum deliverable output current without using secondary components or current sensor.

The board implements several protection features that considerably increase end-product safety and reliability: auxiliary winding disconnection (or brownout) detection, shorted secondary rectifier detection, and transformer saturation protection, all of which are auto-restart mode.

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Data Brief

Key Features

  • Universal input mains range: 90 264 Vac- frequency 45 65 Hz
  • Double output voltage: 13V @ 0.55 A and 3.3 V @ 100 mA peak power
  • Optoless constant-voltage/constant-current output regulation
  • Meets power line communication system specifications with the ST7580
  • Average efficiency: > 70%
  • EMI: in accordance with EN55022-Class-B


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1917: Double output SMPS for power line applications using the ALTAIR04-900 primary controller
1.0 255 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-ISA133V1 gerber files
1.0 675 KB

Bill of Materials

Description Version Size
2.0 8 KB

Schematic Pack

Description Version Size
STEVAL-ISA133V1 schematics
1.0 140 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-ISA133V1ActiveALTAIR04-900-51No availability reported, please contact our Sales officeEcopack2-

(*) 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.