The STR-Z4569 is a quasi-resonant flyback converter IC manufactured by Sanken Electric. This IC is designed for high-efficiency power supplies, particularly in applications requiring a compact size and reduced component count. It integrates a control circuit and a MOSFET, simplifying the design of power supply circuits. The STR-Z4569 incorporates multiple protection features to ensure reliable operation in various operating conditions.

Applications

• LCD TVs
• LED Lighting Power Supplies
• Home Appliances
• Industrial Power Supplies
• Adapter Power Supplies

Features

• Quasi-Resonant Operation: Achieves high efficiency and low EMI noise.
• Integrated MOSFET: Reduces external component count and simplifies PCB layout.
• Built-in Startup Circuit: Eliminates the need for an external startup resistor, reducing power consumption.
• Multiple Protection Functions: Includes Overcurrent Protection (OCP), Overvoltage Protection (OVP), Overload Protection (OLP), and Thermal Shutdown (TSD) for enhanced reliability.
• Soft-Start Function: Minimizes stress on components during startup.
• Low Standby Power: Enables compliance with energy-saving regulations.
• Frequency Reduction Function: Improves efficiency at light loads.

Benefits

• High Efficiency: The quasi-resonant operation and integrated MOSFET contribute to high power conversion efficiency, reducing energy waste and heat generation.
• Compact Design: The integration of the control circuit and MOSFET allows for a smaller PCB footprint, enabling more compact power supply designs.
• Simplified Design: The built-in startup circuit and protection functions reduce the number of external components required, simplifying the design process.
• Improved Reliability: The multiple protection functions safeguard the power supply against various fault conditions, ensuring reliable operation.
• Reduced EMI Noise: The quasi-resonant operation minimizes electromagnetic interference, simplifying compliance with EMI regulations.

Additional Details

The STR-Z4569 operates over a wide input voltage range, making it suitable for various global power standards. The integrated MOSFET is optimized for high-voltage and high-current operation. The IC is available in a through-hole package for easy mounting on PCBs. The specific switching frequency is determined by external components, allowing for optimization based on the application requirements. Sanken provides detailed application notes and design tools to assist engineers in implementing the STR-Z4569 in their power supply designs.