The FSQ0365RN is a 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
• Under-voltage lockout (UVLO) with hysteresis
• Internal startup circuit
• 15ms Built-in soft-start