Power chip

Valley switching converters typically have lower EMI and higher power conversion efficiency than traditional hard-switching converters with fixed switching frequency. The FSQ series is an integrated pulse width modulation (PWM) controller and SenseFET designed for valley switching operation with minimal external parts count. The PWM controller includes an integrated fixed frequency oscillator, undervoltage lockout, leading edge spacing (LEB), optimized gate drivers, internal soft-start, temperature compensated precision current source for loop compensation, and self-protection circuitry. Compared to discrete MOSFET and PWM controller solutions, the FSQ family reduces overall cost, parts count, size and weight; while improving energy efficiency, productivity and system reliability. This device is a basic platform for cost-effective designs of valley-switching flyback converters.