ALTAIR04-900

Overview

The ALTAIR04-900 is a high-voltage offline switcher from STMicroelectronics, integrating a PWM controller and a 900 V avalanche-rugged power MOSFET in a single package. Designed for quasi-resonant flyback converters, it operates directly from rectified mains with minimal external components. The device supports primary-side regulation, eliminating the need for optocouplers and secondary references. It features a switching frequency up to 166 kHz and operates within a supply voltage range of 11.5 V to 23 V. The component includes built-in protections against short circuits and transformer saturation, ensuring reliable performance in isolated AC-DC conversion applications.

Feature Summary

• Integrates a 900 V avalanche-rugged power section with a low-voltage PWM controller in a monolithic package.
• Enables optoless constant voltage operation through all-primary-sensing feedback mechanisms.
• Supports quasi-resonant valley switching to enhance efficiency and reduce electromagnetic interference.
• Provides adjustable maximum output current limits independent of mains variations for safe overload protection.

Applications

• Power supplies for energy meters
• Power line communication modem adapters
• Wide-range mains adapters with double output requirements
• Isolated AC-DC converters for smart grid distribution

Procurement Notes

Verify the specific ordering suffix to ensure the correct packaging format, such as tape and reel or cut tape, matches your assembly requirements. Confirm that the component status remains active before finalizing design-in decisions. Cross-reference the manufacturer part number with official distributor catalogs to validate authenticity and traceability. Ensure that the requested quantity aligns with standard shipping units defined by the supplier. Review the latest product change notifications for any updates regarding assembly sites or material compositions.

Selection Notes

Select this component for designs requiring high voltage isolation and simplified feedback loops without optocouplers. It is suitable for applications demanding robust avalanche ruggedness and primary-side regulation accuracy. Consider the SO16N package constraints and thermal management requirements for the integrated power section. Evaluate the maximum switching frequency limits against EMI filtering needs. Ensure the input voltage range and topology compatibility match the target power supply architecture.

Part Context

The ALTAIR04-900 belongs to the Altair series of high-voltage AC-DC converters from STMicroelectronics. This series is categorized by MOSFET voltage ratings and specific regulation features. The ALTAIR04 sub-series is optimized for primary-side constant voltage operations and includes protections against transformer saturation. It complements other families like VIPerGaN and VIPerPlus by offering a specialized solution for rugged, high-voltage offline switching applications.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation. Designers should consult official STMicroelectronics resources for potential cross-references or next-generation replacements if discontinuation occurs.

FAQ

How does the ALTAIR04-900 achieve regulation without an optocoupler?

It utilizes all-primary-sensing feedback to provide constant output voltage regulation, eliminating the need for secondary voltage references and optocouplers while maintaining accurate regulation.

What type of switching operation does the device support?

The device is specifically designed for offline quasi-resonant flyback converters, supporting quasi-resonant valley switching at switch turn-on.

What protection features are integrated into the ALTAIR04-900?

It includes overcurrent protection against transformer saturation and secondary diode short-circuit, along with auxiliary winding disconnection detection, all operating in auto-restart mode.