This application note introduces anon isolated, soft-switched, single-stage high power factor offline LED driver from onsemi.
The document introduces a cost-effective, non-isolated, soft-switched single-stage offline LED driver designed for high power factor and efficiency. It utilizes a buck-boost converter topology operating in transition mode with the L6562A controller to achieve constant peak current control and reshape the input current waveform near the zero crossing of the AC line voltage. The design targets residential applications, specifically aiming to meet ENERGY STAR specifications for solid-state lighting (SSL) products.
The document describes an 18 W single-stage offline LED driver.
The LED string consists of 18, 1 W white LEDs in series.
The design chooses a maximum switching frequency below 200 kHz.