Power Integrations

TOP232YN

TOP232YN Description

The TOP232YN from Power Integrations is an obsolete but highly capable offline flyback switcher IC, designed for isolated AC/DC power conversion applications. Housed in a TO-220-7B package, this through-hole-mount device integrates a 700V breakdown voltage MOSFET, enabling robust performance in offline power supplies. With a 25W power rating, it operates at a switching frequency range of 66kHz to 132kHz, adjustable via frequency control, and supports a high 78% duty cycle. Its integrated fault protections—including current limiting, over-temperature, and over-voltage—ensure reliable operation in demanding environments. Compliant with RoHS and REACH Unaffected, it suits legacy designs requiring dependable offline switching.

TOP232YN Features

• Topology: Flyback with isolated output for safety-critical designs.
• Integrated 700V MOSFET: Reduces external component count and board space.
• Advanced Protections: Combines current limiting, over-temperature, and over-voltage for robust fault handling.
• Wide Frequency Range (66kHz–132kHz): Enables optimization for efficiency or size.
• High Duty Cycle (78%): Maximizes power delivery in constrained designs.
• Compliance: RoHS Compliant and REACH Unaffected, meeting environmental standards.
• Package: TO-220-7B for easy through-hole mounting and thermal management.

TOP232YN Applications

Ideal for low-to-medium power offline supplies, the TOP232YN excels in:

• Industrial Power Supplies: Reliable operation in harsh conditions with fault protections.
• Consumer Electronics: Compact AC/DC adapters for appliances/chargers.
• LED Drivers: Stable output isolation for lighting systems.
• Legacy Equipment Upgrades: Replacing older designs needing 25W flyback solutions.
• Auxiliary Power Modules: For telecom or networking equipment requiring isolated rails.

Conclusion of TOP232YN

The TOP232YN combines high integration, robust protections, and flexible frequency control in a proven flyback topology. While obsolete, its 700V MOSFET, 25W capability, and fault resilience make it a pragmatic choice for legacy or cost-sensitive designs. Engineers valuing simplicity, isolation, and reliability in offline power conversion will find it a compelling option, particularly in industrial and consumer applications where durability is critical. For modern designs, consider newer alternatives from Power Integrations’ portfolio.