Communications Power

CamSemi Targets “Constant Power” C2283 Controller at Low Cost Networking Adapters

CamSemi plans to expand its share of the fast-growing networking products power supply market with the launch of C2283 — a novel high performance Primary Side Sensing (PSS) flyback controller with a unique constant power (CP) mode.

C2283 has been designed to offer fast load pull-up of electronic products with high input capacitance, such as modems and other networking devices, but is also ideal for set-top boxes and other high volume, energy-efficient universal input adapter applications rated above 8 Watts.

CamSemi’s new CP PSS controller will allow designers to “right size” their networking adapter solutions for the first time, while enjoying system costs and component counts lower than any of today’s more expensive competitive approaches. Previously they had to over specify adapters by adding extra or higher-rated components to ensure their designs were compatible with the “dying gasp” requirement in the ITU-T G.991.2 standard.

C2283 also offers excellent light load efficiency to help manufacturers more easily meet the challenging standby power requirements of EC 1275/2008 tier two.

“CamSemi’s new C2283 controller is being launched to help build on the considerable market successes that we have already achieved in networking products with some of our other products. CamSemi’s C2470 RDFC family was introduced to offer an exceptionally low-cost approach in linear replacement applications, whereas C2283 is cost optimised for voltage-regulated supplies. Our patented PSS controller architecture has been further developed in C2283 to boost light load efficiency, improve performance and integrate a novel constant power mode to improve system-level costs,” said David Baillie, CEO of CamSemi.

C2283 delivers many of the same key design benefits as the company’s existing PSS controller families including: very accurate voltage regulation across the entire load range allowing use of lower cost components elsewhere in the system; quasi-resonant switching to improve efficiency and reduce EMI; and full featured protection.

C2283 is packaged in SOT23-6 and samples are available now. A product datasheet can be downloaded from the design support section of with more detailed information and support available from CamSemi or one of the company’s distributors.

C2283 is the second of a new class of PSS controllers launched by CamSemi within the last month to offer fast load pull-up for networking applications. C2283 has been specifically designed for use with high capacitance loads that deliver longer hold-up times to ride through mains-power disruptions, whereas C2183 is a general-purpose controller for more typical loads and battery-charger applications.

European Commission regulation 1275/2008

EC 1275/2008, the European Commission’s eco-design regulations covering energy efficiency requirements for a range of specific products with standby and/or off modes came into force in January 2010. The rules apply to any IT equipment intended primarily for domestic use, as well as almost all domestic appliances and other consumer products. Under the current ruling, the standby power consumption of networking hubs, routers and other products sold in the EU must not exceed 1 W; although that level is increased to 2 W where products have a status display or a combination of a reactivation function and status display. However the 1 and 2 W limits are being cut to new levels of 0.5 and 1 W respectively from January 2013.

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