Flyback architecture reduces low power AC/DC Losses
28 November 2023 
The QuarEgg PSR (primary side regulation) high performance flyback solution is claimed to significantly improve the efficiency and reduces the size of AC/DC converters that would traditionally have used active clamp flyback (ACF) and quasi-resonant (QR) topologies.
It is built around the company’s patented forced zero voltage switching (ZVS) architecture which delivers a very flat idle-to-full-load efficiency curve ranging from 91% at low load to over 94.5% at maximum power. The architecture can help designers “significantly reduce” total operational losses when compared to conventional ACF and QR techniques. Target applications include routers, set top boxes, white goods and other low power applications where efficiency and power density are key criteria but power factor correction (PFC) is not required.
It is based on Eggtronic’s EPIC QuarEgg PSR IC, a mixed signal, low power controller with multi-mode operation and synchronous rectification control that provides all the necessary PSR without the need for an optocoupler.
“Designers of low-power applications are demanding ever-smaller, higher density power conversion architectures,” comments Igor Spinella, Eggtronic’s CEO and founder.
The integrated, miniature 5.0 x 5.0mm device incorporates an optimised low power mode for enhancing performance at zero and light loads. It also provides built-in protection against over-voltage, over-current, brownout and extreme temperatures, adds the company.