onsemi FSQ0365RN

A Valley Switching Converter generally shows lower EMI and higher power conversion efficiency than a conventional hard−switched converter with a fixed switching frequency. The FSQ−series is an integrated Pulse−Width Modulation (PWM) controller and SENSEFET specifically designed for valley switching operation with minimal external components. The PWM controller includes an integrated fixed−frequency oscillator, under−voltage lockout, Leading−Edge Blanking (LEB), optimized gate driver, internal soft−start, temperature−compensated precise current sources for loop compensation, and self−protection circuitry.

Compared with discrete MOSFET and PWM controller solutions, the FSQ−series reduces total cost, component count, size and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform for cost−effective designs of valley switching fly−back converters.

• Optimized for Valley Switching Converter (VSC)
• Low EMI through Variable Frequency Control and Inherent Frequency Modulation
• High Efficiency through Minimum Voltage Switching
• Narrow Frequency Variation Range Over Wide Load and Input Voltage Variation
• Advanced Burst−Mode Operation for Low Standby Power Consumption
• Pulse−by−Pulse Current Limit
• Protection Functions: Overload Protection (OLP), Over−Voltage Protection (OVP), Abnormal Over−Current Protection (AOCP), Internal Thermal Shutdown (TSD)
• Under−Voltage Lockout (UVLO) with Hysteresis
• Internal Startup Circuit
• Internal High−Voltage SENSEFET: 650 V
• Built−in Soft−Start: 15 ms

• Power Supplies for DVD Player, DVD Recorder, Set−Top Box
• Adapter
• Auxiliary Power Supply for PC, LCD TV, and PDP TV