The STR-G5551 is a quasi-resonant topology IC manufactured by Sanken Electric. It's designed for use in offline flyback converters, offering high efficiency and low noise operation. This power IC integrates a power MOSFET and control circuitry into a single package, simplifying power supply design and reducing the number of external components needed.

Applications:

• Power supplies for LCD TVs
• Adapters for various electronic devices
• Auxiliary power supplies in industrial equipment
• Standby power supplies
• Consumer electronic devices requiring efficient power conversion

Features:

• Quasi-resonant operation: This reduces switching losses and EMI noise.
• Integrated power MOSFET: Simplifies design and reduces component count.
• Built-in protection functions: Includes overcurrent protection (OCP), overvoltage protection (OVP), and thermal shutdown (TSD) for enhanced reliability.
• Low start-up current: Minimizes power consumption during startup.
• Soft-start function: Reduces stress on components during startup.
• Frequency reduction function: Improves efficiency at light loads.
• Avalanche-rugged MOSFET: Enhanced durability and reliability.

Benefits:

• High efficiency: Reduces energy consumption and heat generation.
• Low EMI noise: Simplifies compliance with electromagnetic compatibility standards.
• Simplified design: Reduces the number of external components and simplifies PCB layout.
• Improved reliability: Built-in protection functions prevent damage from fault conditions.
• Compact size: Reduces the overall size of the power supply.

Additional Details:

The STR-G5551 typically operates with an input voltage range suitable for universal AC input (85-265VAC). It provides a stable and regulated output voltage. The specific output voltage and current capabilities depend on the external components selected and the application requirements. The device is typically available in a through-hole package.