Power Integrations

TOP104YN

TOP104YN Description

The TOP104YN from Power Integrations is an obsolete but highly capable offline switching IC designed for AC/DC power conversion applications. Part of the TOPSwitch® series, it integrates a 350V breakdown voltage MOSFET, PWM controller, and fault protection in a TO-220-3 through-hole package. With a switching frequency of 100kHz, it supports isolated outputs and delivers up to 110W of power, making it suitable for medium-power offline supplies. Its 67% duty cycle and integrated current limiting and over-temperature protection enhance reliability in demanding environments.

TOP104YN Features

• Topology Support: Compatible with Boost, Buck, Flyback, and Forward configurations.
• Integrated Protections: Built-in current limiting and thermal shutdown for robust operation.
• High Efficiency: 100kHz switching optimizes performance in compact designs.
• Isolated Output: Ensures safety in offline power supplies.
• Easy Integration: Through-hole mounting simplifies prototyping and production.
• Regulatory Compliance: EAR99, REACH Unaffected, and HTSUS 8542.39.0001 certified.

TOP104YN Applications

• Industrial Power Supplies: Reliable performance in factory automation and control systems.
• Consumer Electronics: Used in adapters, LED drivers, and auxiliary power modules.
• Telecom/Networking Equipment: Provides stable power for routers, switches, and PoE devices.
• Lighting Systems: Ideal for high-voltage LED drivers due to its 350V rating.

Conclusion of TOP104YN

While obsolete, the TOP104YN remains a versatile solution for offline power conversion, offering high integration, robust protections, and flexible topology support. Its 110W output and isolated design make it suitable for industrial, consumer, and telecom applications where reliability is critical. Engineers seeking a proven, all-in-one switcher may still find value in legacy designs incorporating this IC.