Utilizing PFC current control algorithm, 3-level log step dimmable NCL30085, analog/PWM dimmable NCL30086, and non-dimmable NCL30088 address single-stage design implementations up to 60 W that require high power factor. Quasi-resonant mode optimizes efficiency across line and load levels. Also available, NCL30030 supports up to 150 W, 2-stage topologies. Using multiplier architecture, 2-stage PFC controller plus quasi-resonant flyback controller is optimized for applications up to 150 W.