CamSemi C5183 targets lower-cost USB chargers for new generation smartphones

CamSemi has announced the first of a new family of PSS (primary side sensing) fast start flyback controllers to offer the cost, performance, and end-user benefits of integrated start-up. The new C5183 PSS controller features an integrated active UHV (ultra-high voltage) device that allows charging to start in under 0.1 seconds and delivers NLP (no-load power) performance of less than 30 mW. This latest controller will enable a new generation of lower cost, high performance USB chargers for rapid charging of smartphones with extended battery lives, as well as media tablets and other universal input applications rated above 8 W. Integrated start-up also allows CamSemi's latest PSS controller to offer faster, lower cost product testing and a better end-user experience, while eliminating several components compared with competitive approaches at this power level. Most of today's designs were originally developed for low power, mobile phone charger applications but rely on extra components, external start-up switches, and additional circuitry to deliver the required performance. CamSemi's new fast start PSS controller exploits several novel techniques to help manufacturers to reduce further system costs, component counts, and product form factors. Key features include: switching-frequency dither and edge-rate control for low EMI plus superior ripple and low common-mode noise that is equivalent to the demanding performance levels required by IEC 62684 and EN 301 489-34 standards for common mobile phone chargers. The C5183 offers many of the same key design benefits as the company's existing PSS controller families, such as quasi-resonant switching for excellent light-load efficiency with low EMI and full-featured protection, as well as current and voltage regulation of ±5% without board-level trimming. The C5183PX8 is available in SOP-8 and samples are available now. CamSemi