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Off-line all-primary-sensing switching regulator
  • active Active

ALTAIR04-900 is a high-voltage all-primary-sensing switcher intended for operating directly from the rectified mains with minimum external parts. It combines a high-performance low-voltage PWM controller chip and a 900 V avalanche-rugged power section in the same package.

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Errata Sheet
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Key Features

  • Primary side constant voltage operations with no optocoupler
  • Adjustable and main-independent maximum output current for safe operations during overload/short circuit conditions
  • 900 V avalanche rugged internal power section
  • Quasi-resonant valley switching operation
  • Low standby consumption
  • Overcurrent protection against transformer saturation and secondary diode short circuit
  • SO16 package

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS7028: Off-line all-primary-sensing switching regulator
2.1 658 KB

Application Notes

Description Version Size
AN3290: Reference design for double output SMPS for power line modem applications using ALTAIR04-900 primary controller
1.0 3,218 KB
AN4154: Power supply for energy meter and power line modem
2.0 1,139 KB

Related Tools and Software

Related Tools and Software

Part Number Description
EVLALTAIR900-M1 Double output SMPS for power line application using ALTAIR04-900 primary controller
STEVAL-ISA133V1 Double output SMPS for power line applications using the ALTAIR04-900 primary controller

Publications and Collaterals


Description Version Size
653 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeRDS(on) (max) Transistor Breakdown Voltage (min) Drain Current (nom) Order From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
ALTAIR04-900ActiveSO-16Tube.7-.79Distributor reported inventory date: 2014-11-20
Distributor NameRegionStockMin. order
ALTAIR04-900TRActiveSO-16Tape And Reel.7-.79Distributor reported inventory date: 2014-11-21
Distributor NameRegionStockMin. order
ARROWOrder NowEUROPE2729960

(*) 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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