ALTAIR04-900TR

Overview

The ALTAIR04-900TR is a high-voltage offline switcher from STMicroelectronics, integrating a PWM controller and a 900 V avalanche-rugged power MOSFET in a single 16-SO package. It operates directly from rectified mains with a switching frequency up to 166 kHz and requires an operating voltage between 11.5 V and 23 V. The device supports flyback topology with primary-side regulation, eliminating the need for optocouplers. It features internal current limiting and short-circuit protection, ensuring safe operation during overload conditions while maintaining accurate constant voltage output.

Feature Summary

• Integrates a 900 V avalanche-rugged power section with a low-voltage PWM controller for simplified design
• Enables optoless constant voltage operations using all-primary-sensing feedback loops
• Features quasi-resonant valley switching for reduced electromagnetic interference and improved efficiency
• Includes built-in protections against transformer saturation and secondary diode short circuits

Applications

• Power line communication (PLC) system adapters
• Energy meter power supplies
• Low-power isolated AC-DC converters
• Universal input mains adapters

Procurement Notes

Verify the specific suffix TR indicates tape-and-reel packaging when ordering. Confirm that the 900 V rating aligns with your system's voltage stress requirements. Ensure the 16-SO package dimensions fit your PCB layout constraints. Check for RoHS compliance status if required by your manufacturing standards. Validate that the primary-side regulation meets your accuracy specifications without secondary sensing components.

Selection Notes

Select this component for designs requiring minimal external parts and galvanic isolation. It is suitable for applications where cost reduction through optocoupler elimination is prioritized. Consider its 900 V rating for higher voltage mains inputs. Evaluate its thermal performance within the specified junction temperature range. Ensure the maximum output current limits are sufficient for the intended load profile.

Part Context

This part belongs to the ALTAIR series of high-voltage AC-DC converters. The series combines advanced PWM controllers with integrated power switches to simplify SMPS design. The ALTAIR04 variant specifically targets primary-side constant voltage operations with robust avalanche ruggedness. It is designed to reduce PCB space and system cost compared to discrete solutions.

Replacement Considerations

Check for pin-to-pin compatibility with other ALTAIR series devices if different voltage ratings are needed. Verify functional equivalence with VIPerPlus or VIPerGaN families for similar power levels. Ensure substitute parts support the same quasi-resonant flyback topology and primary-side regulation techniques.