FSL126HR: 650V Integrated Power Switch with 100kHz frequency and adjustable current limit for 17W offline flyback converters

The FSL126HR integrates a Pulse Width Modulator (PWM) and SenseFET is specifically designed for highperformance offline Switch-Mode Power Supplies (SMPS) with minimal external components. FSL126HR includes integrated high-voltage power switching regulators that combine an avalanche-rugged SenseFET with a current-mode PWM control block.     The integrated PWM controller includes: Under-Voltage Lockout (UVLO) protection, Leading-Edge Blanking (LEB), a frequency generator for EMI attenuation, an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection, and temperaturecompensated precision current sources for loop compensation and fault protection circuitry. The FSL126HR offers good soft-start performance. When compared to a discrete MOSFET and controller or RCC switching converter solution, the FSL126MR reduces total component count, design size, and weight; while increasing efficiency, productivity, and system reliability. This device provides a basic platform that is well suited for the design of cost-effective flyback converters.

Features

• Internal Avalanche-Rugged SenseFET (650V)
• Under 50mW Standby Power Consumption at265V_AC, No-load Condition with Burst Mode
• Precision Fixed Operating Frequency withFrequency Modulation for Attenuating EMI
• Internal Startup Circuit
• Built-in Soft-Start: 20ms
• Pulse-by-Pulse Current Limiting
• Various Protections: Over-Voltage Protection(OVP), Overload Protection (OLP), Output-ShortProtection (OSP), Abnormal Over-CurrentProtection (AOCP), Internal Thermal ShutdownFunction with Hysteresis (TSD)
• Auto-Restart Mode
• Under-Voltage Lockout (UVLO)
• Low Operating Current: 1.8mA
• Adjustable Peak Current Limit

Application Notes