A Quasi-Resonant Converter (QRC) typically shows lower EMI and higher power
conversion efficiency compared to conventional hard-switched converter with a
fixed switching frequency. Therefore, a QRC is well suited for noise-sensitive
applications, such as color TV and audio. Each product in the FSCQ-Series
contains an integrated Pulse Width Modulation (PWM) controller and a SenseFET,
and is specifically designed for quasiresonant off-line Switch Mode Power
Supplies (SMPS) 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 a loop compensation, and
self protection circuitry. Compared with a discrete MOSFET and PWM controller
solution, the FSCQ-Series can reduce total cost, component count, size, and
weight, while simultaneously increasing efficiency, productivity, and system
reliability. These devices provide a basic platform that is well suited for
cost-effective designs of quasi-resonant switching flyback converters.
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