Power Integrations

TOP243Y

TOP243Y Description

The TOP243Y from Power Integrations is an offline switcher IC designed for flyback topology applications, offering a robust 700V breakdown voltage and 45W power handling capability. This obsolete through-hole-mounted device integrates an internal switch, simplifying design while ensuring high efficiency in isolated power supplies. With a switching frequency range of 66kHz–132kHz and 66.5% duty cycle, it supports flexible power conversion designs. The IC features frequency control for optimized performance and comprehensive fault protection, including current limiting, over-temperature, and over-voltage safeguards, enhancing system reliability.

TOP243Y Features

• High Voltage Tolerance: 700V breakdown voltage for robust offline operation.
• Integrated Switch: Reduces external component count, lowering BOM costs.
• Advanced Protection: Combines current limiting, over-temperature, and over-voltage protection.
• Wide Frequency Range: 66kHz–132kHz switching frequency with frequency control for efficiency tuning.
• Isolated Output: Ensures safety in AC/DC conversion applications.
• High Duty Cycle: 66.5% duty cycle maximizes power delivery.
• REACH Unaffected: Compliant with environmental regulations.

TOP243Y Applications

The TOP243Y is ideal for low-to-medium power AC/DC conversion in:

• Industrial Power Supplies: Reliable operation in harsh environments.
• Consumer Electronics: Adapters, LED drivers, and auxiliary power units.
• Telecom Systems: Isolated power modules for network equipment.
• Household Appliances: Cost-effective offline switcher for white goods.

Conclusion of TOP243Y

The TOP243Y stands out for its integrated design, robust protection features, and high-voltage capability, making it a dependable choice for offline flyback converters. While obsolete, its 45W power handling and isolation remain valuable for legacy systems or designs prioritizing simplicity and reliability. Engineers seeking a proven, all-in-one offline switcher for industrial or consumer applications may find the TOP243Y a compelling solution.