Power Integrations

TOP223Y

TOP223Y Description

The TOP223Y from Power Integrations is an obsolete but historically significant offline switching IC designed for AC/DC power conversion in compact, high-efficiency applications. Housed in a TO-220-3 package with through-hole mounting, it integrates a 700V breakdown voltage MOSFET, enabling robust performance in isolated power supplies. With a 100kHz switching frequency and 50W power handling, it supports boost, buck, flyback, and forward topologies, making it versatile for diverse designs. Its 67% duty cycle and built-in current limiting and over-temperature protection enhance reliability in demanding environments.

TOP223Y Features

• Integrated 700V MOSFET: Reduces external component count and simplifies design.
• Multi-Topology Support: Compatible with flyback, forward, buck, and boost configurations.
• Protection Mechanisms: Combines current limiting and thermal shutdown for fault resilience.
• High Switching Frequency (100kHz): Enables smaller magnetics and capacitors for compact designs.
• Isolated Output: Suitable for safety-critical applications requiring galvanic isolation.
• Wide Duty Cycle (67%): Optimizes efficiency across varying load conditions.

TOP223Y Applications

Ideal for obsolete but legacy systems, the TOP223Y excels in:

• Industrial Power Supplies: Low-to-mid-power offline converters for control systems.
• Consumer Electronics: Adapters, LED drivers, and auxiliary power modules.
• Telecom/Networking Equipment: Isolated DC-DC converters for embedded systems.
• Lighting: Ballasts and dimmable LED power stages.

Conclusion of TOP223Y

While no longer in production, the TOP223Y remains a benchmark for integrated offline switchers, offering a balance of high voltage tolerance, topology flexibility, and built-in protection. Its legacy lies in simplifying 50W power supply designs with minimal external components. Engineers maintaining older systems or studying power electronics may still reference its architecture for efficient, isolated solutions. For modern alternatives, consult Power Integrations' updated product lines.