FSQ0370RNA: 700V Integrated Power Switch with 100kHz for 19W offline flyback converters

The FSQ0370 consists of an integrated Current Mode Pulse Width Modulator (PWM) and an avalanche rugged 700V SenseFET. It is specifically designed for high-performance offline Switched Mode Power Supplies (SMPS) with minimal external components. The integrated PWM controller features include: a fixed-frequency generating oscillator, Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), an optimized gate turn-on / turn-off driver, Thermal Shutdown (TSD) protection, and temperature-compensated precision current sources for loop compensation and fault protection circuitry. Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSQ0370 reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters, such as in PC auxiliary power supplies.

Features

• Internal Avalanche Rugged 700V SenseFET
• Consumes only 0.8W at 230 V_AC & 0.5W Load withBurst-Mode Operation
• Precision Fixed Operating Frequency, 100kHz
• Precision Fixed Operating Frequency, 100kHz
• Internal Start-up Circuit and Built-in Soft-Start
• Pulse-by-Pulse Current Limiting and Auto-RestartMode
• Over-Voltage Protection (OVP), Overload Protection(OLP), Internal Thermal Shutdown Function (TSD)
• Under-Voltage Lockout (UVLO)
• Low Operating Current (3mA)
• Adjustable Peak Current Limit

Application Notes