FSQ110: 650V Integrated Power Switch for 8Watt offline flyback converters

The FSQ110 consists of an integrated, current-mode, Pulse Width Modulator (PWM) and an avalanche-rugged 650V SenseFET. It is specifically designed for high-performance off-line Switch-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 FSQ110 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.

Features

• Internal Avalanche-Rugged 650V SenseFET
• Consumes only 0.65W at 230V_AC & 0.3W Load with Burst-Mode Operation
• Precision Fixed Operating Frequency: 100KHz
• Internal Start-up Circuit and Built-in Soft-Start
• Pulse-by-Pulse Current Limiting and Auto-Restart Mode
• 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