TOP233G

TOP233G - TOPSwitch-FX Offline Switching IC for High-Efficiency Power Supplies

The TOP233G from Power Integrations is a high-performance, fully-integrated offline switching IC in the renowned TOPSwitch-FX family. Engineered for isolated flyback AC/DC power supply applications up to 25 watts, this advanced IC combines a 700V power MOSFET, precision oscillator, high-voltage switched current source, current limit, and comprehensive shutdown circuitry onto a single monolithic chip—dramatically reducing component count, board space, and design complexity.

Key Features & Technical Advantages

• Fully Integrated Solution: Combines power MOSFET, control, and protection circuits to minimize external components and simplify power supply design
• Wide Switching Frequency Range: 66kHz to 132kHz enables flexible transformer design and optimization for size, cost, and EMI performance
• Comprehensive Built-In Protection: Integrated current limiting, over-temperature shutdown, and over-voltage protection ensure robust, reliable operation
• High Efficiency Design: 78% maximum duty cycle maximizes power delivery and conversion efficiency
• Extended Operating Temperature: -40°C to 150°C junction temperature rating for demanding industrial and automotive applications
• Compact SMD Package: Space-saving surface mount SMD-8B (8-pin gull wing) configuration ideal for high-density PCB layouts
• 700V Breakdown Voltage: High-voltage capability provides excellent margin for universal AC input designs (85-265VAC)
• Frequency Jitter: Built-in frequency modulation reduces EMI and simplifies compliance testing

Typical Applications & Use Cases

• AC/DC Adapters & Chargers: Mobile devices, laptops, consumer electronics
• Auxiliary Power Supplies: Standby power, housekeeping supplies in larger systems
• Consumer Electronics: Set-top boxes, home appliances, audio equipment
• Industrial Control Systems: PLCs, sensors, instrumentation power
• LED Driver Circuits: Offline LED lighting applications
• Smart Home Devices: IoT devices, smart switches, connected appliances

Why Choose TOP233G?

The TOP233G offers exceptional value for engineers designing cost-effective, reliable offline power supplies. Its integrated approach eliminates the need for separate control ICs, optocouplers, and complex feedback networks, reducing BOM cost by up to 40% compared to discrete solutions. The built-in protection features enhance system reliability and safety compliance, while the wide operating temperature range ensures performance in harsh environments.

Quality & Reliability

As an authorized distributor of Power Integrations components, we provide genuine TOP233G ICs with full manufacturer traceability, quality certifications, and technical support. Each component is sourced directly from Power Integrations or authorized channels, ensuring authenticity and reliability for your critical power supply designs.

Design Resources Available: Datasheets, application notes, reference designs, and technical support to accelerate your development cycle.

All specifications are subject to manufacturer's datasheet. Contact us for current availability, lead times, volume pricing, and technical assistance.

• TOP233G.pdf