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Double output SMPS for power line application using ALTAIR04-900 primary controller
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This board implements a 7.5 W double output wide range mains adapter with constant voltage - constant current, developed to build an innovative AC-DC adapter to supply a complete power line communication 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 V to supply digital circuitry and an optional external microcontroller.

The 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 RDS(on), 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 still maintaining quite accurate regulation.

In addition, by using the primary constant current loop (CC loop), it is possible to set the maximum deliverable output current without any secondary components or current sensor.

The board implements several protections 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 in 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: 13 V @ 0.55 A and 3.3 V @ 100 mA peak power
  • Optoless constant voltage - constant current output regulation
  • Meets power line communication system specifications based on the ST7580
  • Average efficiency: > 70%
  • EMI: According to EN55022-Class-B


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1517: Double output SMPS for power line applications using the ALTAIR04-900 primary controller
1.0 100 KB

User Manual

Description Version Size
UM1518: ST7580 power line modem demonstration kit graphical user interface (GUI)
2.0 1,866 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
Gerber files for EVLALTAIR900-M1
2.1 187 KB

Bill of Materials

Description Version Size
2.1 146 KB

Schematic Pack

Description Version Size
EVLALTAIR900-M1 schematic
2.1 75 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
EVLALTAIR900-M1ActiveALTAIR04-900-Distributor reported inventory date: 2015-10-09
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA80

(*) 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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