The STRF6656 is a quasi-resonant flyback converter IC manufactured by Allegro MicroSystems. It is designed for offline power supplies, offering high efficiency and low noise operation. This IC integrates a power MOSFET and control circuitry into a single package, simplifying power supply design and reducing the overall component count.

Applications:

• LCD TV power supplies
• LED lighting power supplies
• Adapter power supplies
• Auxiliary power supplies
• Industrial power supplies

Features:

• Quasi-resonant operation: Minimizes switching losses and improves efficiency.
• Integrated power MOSFET: Reduces external component count and simplifies design.
• Overvoltage protection (OVP): Protects the power supply from damage due to excessive voltage.
• Overcurrent protection (OCP): Prevents damage from excessive current flow.
• Overload protection (OLP): Protects the power supply from overload conditions.
• Thermal shutdown protection (TSD): Shuts down the IC in the event of overheating.
• Soft-start function: Limits inrush current during startup.

Benefits:

• High efficiency: The quasi-resonant operation minimizes switching losses, resulting in a more efficient power supply.
• Reduced component count: The integrated power MOSFET and control circuitry reduce the number of external components required, simplifying design and lowering costs.
• Improved reliability: The built-in protection features protect the power supply from damage, increasing its reliability.
• Lower EMI: The quasi-resonant operation reduces electromagnetic interference (EMI).
• Simplified design: The integrated features simplify the power supply design process.

Additional Details:

The STRF6656 operates over a wide input voltage range and is available in various package options. The switching frequency is typically in the range of 60 kHz to 130 kHz. It is important to consult the datasheet for detailed electrical characteristics, application circuit examples, and thermal considerations. Proper heatsinking is essential to ensure reliable operation, especially at high power levels.