FSL137MRIN: 700V Integrated Power Switch with Line OVP and Abnormal OCP for 20Watt offline flyback converters

The FSL137MRIN is an integrated Pulse Width Modulation (PWM) controller and SenseFET specifically designed for offline Switched Mode Power Supplies (SMPS) with minimal external components. The PWM controller includes an integrated fixed-frequency oscillator, Line Over-Voltage Protection (LOVP), Under-Voltage Lockout (UVLO), Leading-Edge Blanking (LEB), optimized gate driver, internal soft-start, temperature-compensated precise current sources for loop compensation, and self-protection circuitry.

Compared with a discrete MOSFET and PWM controller solution, the FSL137MRIN reduces total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform suited for cost-effective design of flyback converters.

Features

• Advanced Soft Burst Mode for Low Standby Power and Low Audible Noise
• Random Frequency Fluctuation (RFF) for Low EMI
• Under 50 mW Standby Power Consumption at 265 V_AC, No-load Condition with Burst Mode
• Pulse-by-Pulse Current Limit
• Overload Protection (OLP), Over-Voltage Protection (OVP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD) with Hysteresis, Output-Short Protection (OSP), and Under-Voltage Lockout (UVLO) with Hysteresis, Line Over-Voltage Protection (LOVP)
• Low Operating Current (0.4 mA) in Burst Mode
• Internal Startup Circuit
• Internal High-Voltage SenseFET: 700 V
• Built-in Soft-Start: 15 ms
• Auto-Restart Mode