TOP257EN

TOP257EN - TOPSwitch-HX Flyback Switching IC

The TOP257EN is a high-performance offline switcher from Power Integrations' TOPSwitch-HX family, designed for isolated flyback power supply applications up to 157W. This integrated IC combines a 700V power MOSFET, oscillator, high-voltage current source, and protection circuitry in a compact eSIP-7C through-hole package.

Key Features & Benefits

• High Power Capability: Delivers up to 157W output power with excellent efficiency
• Dual Frequency Operation: 66kHz/132kHz switching frequencies for optimized performance
• Comprehensive Protection: Built-in current limiting, over-temperature, and over-voltage protection
• Wide Operating Range: -40°C to 150°C junction temperature for demanding environments
• High Breakdown Voltage: 700V rating ensures reliable operation in universal input applications
• 78% Maximum Duty Cycle: Enables efficient power conversion
• RoHS Compliant: Meets environmental standards for global markets

Typical Applications

• AC-DC power supplies for industrial equipment
• Telecom and networking power systems
• Medical device power supplies
• Consumer electronics adapters
• Automotive auxiliary power supplies

Why Choose TOP257EN?

The TOP257EN simplifies power supply design by integrating critical functions into a single component, reducing component count, board space, and design complexity. Its robust protection features ensure reliable operation in harsh environments, while the high breakdown voltage supports universal AC input designs. Backed by Power Integrations' reputation for quality and reliability, the TOP257EN is the ideal choice for engineers seeking a proven, cost-effective solution for medium-power isolated flyback applications.

• TOP257EN.pdf