The SG6858TZNL is a highly integrated PWM controller from Fairchild/ON Semiconductor designed for offline flyback converter applications. It features a current mode PWM controller with built-in protection features, offering a cost-effective and reliable solution for power supply designs requiring low standby power and high efficiency. This device is commonly used in adapters and chargers for various consumer electronics.

Applications

• AC/DC Adapters for Consumer Electronics (e.g., set-top boxes)
• Battery Chargers for Mobile Devices
• Standby Power Supplies
• LED Lighting Power Supplies
• Small Power Adapters

Features

• Current Mode PWM Control: Provides stable operation and excellent line/load regulation.
• Low Startup Current: Minimizes power consumption during startup.
• Frequency Jittering: Reduces EMI emissions by spreading the switching frequency.
• Over-Temperature Protection (OTP): Protects the device from thermal damage.
• Over-Voltage Protection (OVP): Prevents output voltage from exceeding safe limits.
• Over-Current Protection (OCP): Limits output current to protect the device and the load.
• Under-Voltage Lockout (UVLO): Ensures reliable startup and prevents erratic operation.
• Open-Loop Protection (OLP): Protects the power supply in case of a feedback loop failure.
• Soft-Start Function: Reduces stress on components during power-up.
• Cycle-by-Cycle Current Limiting: Provides fast and accurate current limiting.

Benefits

• High Efficiency: Minimizes power losses for energy-efficient operation.
• Compact Design: Integrated features reduce board space.
• Enhanced Reliability: Comprehensive protection features ensure robust performance.
• Simplified Design: Requires fewer external components, reducing design complexity.
• Improved EMI Performance: Frequency jittering minimizes electromagnetic interference.
• Cost-Effective: Integrated features contribute to a lower system cost.
• Low Standby Power: Meets stringent energy efficiency requirements for standby power.

Additional Details

The SG6858TZNL typically operates with a fixed switching frequency, optimized for efficiency and EMI reduction. It usually comes in an SOP package. Detailed specifications, including voltage and current ratings, switching frequency, and thermal characteristics, are available in the datasheet. Designed to comply with international safety and energy efficiency standards.